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CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 4 - MCQExams.com
CBSE
Class 12 Engineering Chemistry
Biomolecules
Quiz 4
STATEMENT-1 : Guanine unites with cytosine with three hydrogen bonds.
STATEMENT-2 : Guanine and cytosine are purines while that of thymine is a pyrimidine.
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is False
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STATEMENT-1 is False, STATEMENT-2 is True
Ascorbic acid resemble the structure of
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Vitamin A
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Glucose
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Cellulose
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Vitamin D
Explanation
Ascorbic acid resembles the structure of glucose. It is also called a vitamin $$C$$. Its molecular formula is $$C_6H_8O_6$$. This vitamin is derived from glucose, thus its structure resembles glucose.
STATEMENT-1 : Pyridoxine is a water soluble vitamin.
STATEMENT-2 : Pyridoxine contains a chromone ring with 3-methyl groups.
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is not a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is False
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STATEMENT-1 is False, STATEMENT-2 is True
Explanation
Option (C) is correct.
STATEMENT 1- Pyridoxine is a water-soluble vitamin. These are packed into the watery portions of the foods we eat. They are absorbed directly into the bloodstream as food is broken down during digestion.
STATEMENT 2- Pyridoxine contains chromone ring with 1- methyl group. The chemical name of pyridoxine is 2-methyl-3-hydroxy-4,5-bis(hydroxy-methyl)pyridine.
STATEMENT-1: Morphactin inhibits mitosis.
STATEMENT-2: Morphactin is derived from fluorene-9-carboxylic acid.
Select the correct option regarding given statements:
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
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STATEMENT-1 is True, STATEMENT-2 is False
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STATEMENT-1 is False, STATEMENT-2 is True
Explanation
Morphactins inhibit mitosis in the root meristem and disturb the polarity of cell division.
Morphactin is a derivative of fluorene-9-carboxylic acid and is often called "antigibberellin"
Thus, STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1.
The chemical change in DNA molecule that could lead to synthesis of protein with an altered amino acid sequence is called
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replication
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lipid formation
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cellular membrane
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mutation
Explanation
The chemical change in DNA molecule that could lead to synthesis of protein with an altered amino acid sequence is called mutation. This may have sever biological implications.
Molecular formula of Retinol is:
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$$C_{20}H_{29}OH$$
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$$C_{17}H_{35}OH$$
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$$C_{12}H_{25}OH$$
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$$C_{17}H_{33}OH$$
Explanation
Molecular formula of retinol is $$C_{20}H_{29}OH$$.
It is also called as vitamin $$A$$, and is essential for vision, particularly night vision, normal bone and tooth development, reproduction, and the health of skin and mucous membranes.
It also acts as an antioxidant.
Option A is correct
In which of the following ketonic group is absent?
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Guanine
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Thymine
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Adenine
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Uracil
Explanation
In adenine, ketonic group is absent.
Which of the following statements about RNA is not correct?
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It has a single strand
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It does not undergo with the replication of bases
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It does not contain any pyrimidine base
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It controls the synthesis of proteins
Explanation
Cytosine is a pyrimidine base, and it is present in RNA. Hence, option C is incorrect.
Match the following:
List - I List - II
A. Vitamin B$$_{1}$$ Riboflavin
B. Vitamin B$$_{2}$$ Pantothenic acid
C. Vitamin B$$_{3}$$ Niacin
D. Vitamin B$$_{5}$$ Thiamine
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A - 4, B - 1, C - 3, D - 2
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A - 4, B - 1, C - 2, D - 3
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A - 3, B - 4, C - 2, D - 1
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A - 4, B - 3, C - 1, D - 2
Explanation
Vitamin $$B_1$$ is called Thiamine.
Vitamin $$B_2$$ is called Riboflavin.
Vitamin $$B_3$$ is called Niacin.
Vitamin $$B_5$$ is called
Pantothenic acid.
The correct match is A-4, B-1, C-3, D-2.
Hence, the correct option is A.
In nucleic acids, the sequence is :
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phosphate-sugar-base
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sugar-acid-phosphate
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sugar-base-phosphate
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base-phosphate-sugar
Explanation
In nucleic acids, the sequence is phosphate-sugar-base. There are three potential metal binding groups on nucleic acids: phosphate, sugar and base moieties.
___________ are the chemical messengers that are used by multicellular organisms for control
and coordination.
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Vitamins
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Minerals
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Antibiotics
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Hormones
Explanation
Hormones are the chemical messengers that are produced by the endocrine system (composed of glands) but are transported to different parts of the body through the bloodstream.
Hormones play an important role in the control and coordination of the body. For example, the growth of an individual is regulated by growth hormones secreted by the pituitary gland.
Which fat soluble vitamin is present in liver cell?
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$$A$$
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$$D$$
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$$E$$
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Both Vitamin A and D
Explanation
Vitamin A, D, E, K are fat-soluble vitamin
A is present in liver cell
D is present in liver cell and beef liver and eggs
E is present almond and sunflower
Hence, the correct option is $$\text{D}$$
Consider the given statements:
I. Maltose is also known as malt sugar.
II. Sucrose is also known as cane sugar.
III. Lactose is also known as grape sugar.
IV. Starch is also known as amylum.
The correct statement(s) is/are:
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I, II and IV
0%
I, II and III
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II, III and IV
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All
Explanation
(I) Maltose is also known as malt sugar.
(II) Sucrose is also known as cane sugar.
(III) Lactose is also known as milk sugar.
(IV) Starch is also known as amylum.
Hence, option A is correct.
An example of water soluble vitamin is:
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vitamin D
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vitamin E
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vitamin A
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vitamin C
Explanation
Vitamin $$C$$ is
water soluble vitamin.
Vitamin $$D, E, A$$ are fat soluble vitamins.
Vitamins are classified as either fat soluble (vitamins $$A, D, E$$ and $$K$$) or water soluble (vitamins $$B$$ and $$C$$).
The fat soluble vitamins are soluble in lipids (fats). These vitamins are usually absorbed in fat globules by the small intestines and into the general blood circulation within the body. While water soluble vitamins are directly absorbed by the body.
Option D is correct.
Match the following.
SET A SET B
Name of hormone Functional group in hormones
1) Testosterone a) double bond
2) Estradiol b) Ketone
3) Progesterone c) Alcohols
4) Ethylene d) Alcohol and ketone
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1 - d; 2 - c; 3 - b; 4 - a
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1 - a; 2 - b; 3 - c; 4 - d
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1 - c; 2 - d; 3 - a; 4 - b
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1 - b; 2 - c; 3 - d; 4 - a
Explanation
Testosterone contains alpha beta unsaturated carbonyl group and a secondary OH group.
Estradiol contains a phenolic OH group and a secondary alcohol.
Progesterone contains alpha beta unsaturated carbonyl group and carbonyl group.
Ethylene contains a carbon carbon double bond.
Vitamin B$$_{6}$$ is known as:
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pyridoxine
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thiamine
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tocopherol
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riboflavin
Explanation
Vitamin $$B_6$$ is known as pyridoxine. It
is required by your body for utilization of energy in the foods you eat, production of red blood cells, and proper functioning of nerves.
Pyridoxine is one form of vitamin $$B_6$$. Its hydrochloride salt pyridoxine hydrochloride is used as vitamin $$B_6$$ dietary supplement
Two vitamins absorbed from intestines, along with fats, are:
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A and D
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A and B
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A and C
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D and B
Explanation
Vitamins $$A$$ and $$D$$ are absorbed from intestines along with fats. These are fat soluble vitamins, which are absorbed in fat globules (called chylomicrons) that travel through the lymphatic system of the small intestines, and into the general blood circulation within the body.
The source of folic acid is:
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yeast
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spinach leaf
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liver of ox
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all of the above
Explanation
The source of folic acid is spinach leaf. It is also found in asparagus, lettuce, chick peas, sprouts, beets, broccoli, corn, green peas, oranges, orange juice, legumes and green leafy vegetables.
Consider the given statements.
I. Dextrin and glycogen are polysaccharides
II. Lactose and glucose are disaccharides
III.Sucrose and maltose are disaccharides
IV. Raffinose is oligosaccharide
The incorrect statements is/are:
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only II
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I and II
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I, II and III
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IV only
Explanation
Option (A) is right. The incorrect statement is (II).
(II) Lactose is a disaccharide while glucose is an aldosic monosaccharide.
What is the generic name of riboflavin?
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Vitamin $$B_{1}$$
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Vitamin $$B_{2}$$
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Vitamin $$B_{6}$$
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Vitamin $$B_3$$
Explanation
Generic name of riboflavin is vitamin $$B_{2}$$.
Riboflavin is used in combination with other $$B$$ vitamins in vitamin $$B$$ complex products.
It is also used for treating riboflavin deficiency, acne, muscle cramps, burning feet syndrome, carpal tunnel syndrome and blood disorders.
Some people use riboflavin for eye conditions including eye fatigue, cataracts, and glaucoma.
Option B is correct.
Which of the following statements is/are incorrect?
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Glucose is non reducing sugar
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Sucrose is reducing sugar
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Maltose is non reducing sugar
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Lactose is non reducing sugar
Explanation
Glucose, maltose, and lactose are reducing sugars. These sugars contain aldehyde or ketonic groups that are oxidized to carboxylic acids.
Sucrose is a non-reducing sugar. It does not have any group, which can be reduced to -$$OH$$ group by chemical reaction.
All options are incorrect.
The two functional groups present in a typical carbohydrate are:
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$$-OH$$ and $$-COOH$$
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$$-CHO$$ and $$-COOH$$
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$$>C = O$$ and $$-OH$$
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$$-OH$$ and $$-CHO$$
Explanation
Carbohydrates are primarily hydroxyl carbonyl compounds. Hence, $$ C = O$$ and $$OH$$ bonds are present.
Which of the following is called "biological middle man"?
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Hormone
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Vitamin
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Enzyme
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All of the above
Explanation
Enzymes are proteinaceous in nature. These are the biocatalyst that speeds up the chemical reaction by lowering the activation energy of a reaction without undergoing any change in itself because of this peculiar nature they are known as
"Middle Man".
Which of the following $$\alpha$$-amino acids does not contain a chiral carbon?
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Glycine
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Alanine
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Phenylalanine
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Valine
Explanation
Glycine does not contain a chiral carbon.
As two H atoms are attached to the tetrahedral carbon atom. Hence, it is achiral.
A disaccharide, on hydrolysis, gives:
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two molecules of the same monosaccharide
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one molecule each of the same monosaccharide
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three molecules of the same monosaccharide
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two molecules of the same or one molecule each of two different monosaccharides
Explanation
A disaccharide on hydrolysis gives two molecules of the same or one molecule each of two different monosaccharides since a disaccharide is defined as the sugar formed by the glycosidic linkage of 2 monosaccharides. Consider, for example, maltose. It hydrolyses to give 2 molecules of glucose.
Synthesis of each molecule of glucose in photosynthesis involves:
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$$10$$ molecules of ATP
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$$8$$ molecules of ATP
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$$6$$ molecules of ATP
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$$18$$ molecules of ATP
Explanation
$$12H_{2}O+12NADP+18ADP\xrightarrow[]{Light \ reaction}6O_{2}+18ATP+12 NADPH $$
$$
6CO_{2}+12NADPH+18\ ATP \xrightarrow[]{Dark\ reaction}C_{6}H_{12}O_{6}+12NADP+18ADP+6H_{2}O
$$
Net reaction: $$6CO_{2}+6H_{2}O\rightarrow C_{6}H_{12}O_{6}+6O_{2}$$
Consider the given statements about polysaccharides.
I. These are amorphous solids
II. These are insoluble in water
III. These are sugars
The incorrect statements is/are:
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only III
0%
II and III
0%
I and III
0%
All
Explanation
Polysaccharides are amorphous, tasteless and insoluble in water. Sugar mainly contains monosaccharides and some disaccharides. Polysaccharides are not sugars. Thus, only statement III is incorrect.
Which of the following is a naphthaquinone derivative?
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Vitamin K
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Vitamin D
0%
Vitamin A
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Vitamin B
5
Explanation
Vitamin K is a naphthaquinone derivative. It contains isoprene units.
It is also called as "anti-haemorrhagic" vitamin.
Which of the following is incorrect about polysaccharides?
I. These are amorphous solids.
II. These are sparingly soluble in water.
III. These are sugars.
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Only III
0%
II and III
0%
I and III
0%
All of the above
Explanation
Polysaccharides are amorphous, tasteless and insoluble in water.
They are non sugars.
Thus only statement III is incorrect.
Diastase enzyme converts _________ to _________.
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glucose to ethyl alcohol
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starch to maltose
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maltose to glucose
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sucrose to glucose
Explanation
The conversion of starch to maltose is catalyzed by the enzyme diastase.
$$starch \xrightarrow {diastase} maltose$$
Option B is correct.
Which of the following vitamins are water soluble?
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A
0%
C
0%
B
0%
D
Explanation
There are two different types of vitamins. These are fat-soluble vitamins and water-soluble vitamins. Fat-soluble vitamins, vitamins A, D, E and K, dissolve in fat before they are absorbed in the bloodstream, to carry out their functions. Excess of these vitamins are stored in the liver, and is harmful if accumulated.
Water-soluble vitamins dissolve in water and are not stored by the body. Excess of these vitamins are eliminated in urine, hence, we require a continuous daily supply of them in our diet. The water-soluble vitamins include the vitamin B-complex group and vitamin C.
Which of the following is not a part of enzyme but it activates the enzyme?
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K
0%
Zn
0%
Mo
0%
Mn
Explanation
Enzymes requires metal ion as a cofactor which activates their catalytic activity. For example carbonic anhydrase and alcohol dehydrogenase require zinc, arginase and ribonucleotide reductase require manganese, dinitrogenase and nitrate reductase require molybdenum, pyruvate kinase requires potassium. The metal ions Mo, Zn and Mn are present at the active site of enzymes and the respective enzymes are called metalloproteins but potassium requiring enzymes are not metalloproteins as it is not a part of enzyme but it activates the enzyme.
Which one of the following is wrongly matched?
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Fungi - Chitin
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Phospholipid - Plasma membrane
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Enzyme - Lipopolysaccharide
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ATP - Nucleotide derivative
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Antibody - Glycoprotein
Explanation
Enzymes are not lipopolysaccharide in nature. Most of the enzymes are catalytic proteins. Some enzymes, which catalyze splicing of introns and replication of telomeres in eukaryotic cell, are catalytic RNA molecules.
The ratio of the enzyme to substrate molecule can be as high as ___________.
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1 : 1000
0%
1 : 1,00,000
0%
1 : 10,00,000
0%
1 : 50,000
Explanation
The enzyme attaches to the active site of the substrate. On attachment to the active site, the substrate is changed into the product. The active site has a residue that helps in the attachment of the substrate. The substrate molecules form a temporary bond with the enzyme at the active site. The ratio of enzyme to substrate molecules can be as high as 1 : 10,00,000. If the amount of substrate increases more than this, it will not get the vacant active site for attachment which terminates the reaction.
So, the correct answer is option C.
Which one of the following is the cofactor of carbonic anhydrase?
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Fe
0%
Zn
0%
Cu
0%
Mg
Explanation
Iron (Fe) is an important component of hemoglobin, the substance in red blood cells that carries oxygen from your lungs to transport it throughout your body.
Zinc (Zn) is a cofactor for alcohol dehydrogenase and carbonic anhydrase.
Copper (Cu) is a cofactor for one form of nitrite reductases.
Magnesium (Mg) is a cofactor for enzyme glucose 6-phosphatase involved in the process of glycolysis.
So, the correct answer is option B.
Which of the following statement is correct about the enzymes?
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They are most active at pH 7.0.
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They are all amino acids.
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They are all proteins except ribozymes.
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They are most active at a temperature of 0$$^o$$C.
Explanation
All enzymes have different optimum pH values. For example, protein-digesting enzymes are highly active at very low pH whereas salivary amylase is most active at alkaline pH.
Biochemically enzymes are polymers of amino acids. They are not amino acids but are polymers of amino acids.
Enzymes are active in a narrow biological range of temperature and pH. Thus, enzymes become inactive at very low or very high temperatures.
Most of the enzymes barring a few exceptions are proteins. Few non-proteinaceous enzymes are catalytic RNAs i.e. ribozymes.
So, the correct answer is '
They are all proteins except ribozymes.'
Enzymes are absent in
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Algae
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Fungi
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Bacteria
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Virus
Explanation
Enzymes are biological catalysts. Without enzymes no biochemical reaction can take place in any living cell at biologically significant rate. Virus are non living, crystallizable entities. Hence, virus do not have any enzymes of their own but make use of enzyme machinery of the host for their replication.
Which of the following enzyme was first isolated and purified in the form of crystals __________.
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Amylase
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Urease
0%
Ribonuclease
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Pepsin
Explanation
In 1897, Eduard Buchner discovered that yeast extracts could ferment sugar to alcohol, proving that fermentation was promoted by molecules that continued to function when removed from cells. Frederick W. Kuhne called these molecules like enzymes. The isolation and crystallization of urease by James Sumner, in 1926, provided a breakthrough in early enzyme studies.
Sumner found that urease crystals consisted entirely of protein, and he postulated that all enzymes are proteins. In the absence of other examples, this idea remained controversial for some time.
Only in the 1930s, was Sumners conclusion widely accepted, after John Northrop and Moses Kunitz crystallized pepsin, trypsin, and other digestive enzymes and found them also to be proteins.
Most of the biochemical reactions differ from those occurring in the non-living world in ________________.
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Requiring energy
0%
Releasing energy
0%
Being enzymatic
0%
Being spontaneous
Explanation
C. Being enzymatic
Solution : Most of the biochemical reactions are enzymatic in nature unlike the chemical reactions in the nature that either release or require energy without catalysts.
So the correct answer is " Being enzymatic".
Enzymes as they exist inside the cell are
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In solid form.
0%
In crystalline form.
0%
In colloidal form.
0%
In solution form.
Explanation
Enzymes are biological catalysts that catalyze metabolic reactions inside living cells. Mostly enzymes are made up of proteins and have a high molecular weight example 6000 for bacterial ferredoxin, 250,000 for catalase, 483,000 for urease and 4600,000 for pyruvate dehydrogenase. Therefore, enzymes occurs in colloidal state (particle size 1-200 nm) inside living cells.
Modern detergents contain enzyme preparations of
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Thermoacidophiles
0%
Thermophiles
0%
Acidophiles
0%
Alkaliphiles
Explanation
Enzyme detergents have basic or alkaline pH with values ranging between 8 and 10.5. Hence, the enzymes in detergents should be active at alkaline pH or be an alkaliphile. At present only proteases and amylases are commonly used. Although a wide range of lipases is known, but lipases suitable for use in detergent preparations have been described recently.
Transition state structure of the substate formed during an enzymatic reaction is
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Transient but stable
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Permanent but unstable
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Transient and unstable
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Permanent and stable
Explanation
Transition state is intermediate state produced during enzymatic biochemical reaction which is transition
state and unstable state
Enzymes are found in all living cells. Their main function is
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To help in the digestion of food
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To allow chemical reaction to food
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To speed up the breakdown of substance
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To accelerate the rate of chemical reactions
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To help in making new compounds
Explanation
Enzymes are biocatalyst produced by living cells that is
capable of speeding up specific chemical reaction.
The complex formed by a pair of synapsed homologous chromosomes is called :Homologous chromosome are paired and synapsed during zygotene stage of meiosis-I and known as bivalent
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NADH
0%
ATP
0%
$$H_2$$O
0%
$$FAD^+$$ or $$FADH_2$$
Explanation
Pathway-A is glycolysis
Pathway-B is Krebs cycle
Pathway-C is Electron transport system
1, 5 are respiratory substrates like protein and fats 6,7,3,9,10 are $$NADH_2$$, $$FADH_2$$
* 4, 8, 12 are ATP produced
Which is correct statement?
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Starch is polymer of $$\alpha$$-glucose.
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Amylose is a component of cellulose.
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Proteins are composed of only one type of amino acid.
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In cyclic structure of fructose, there are four carbons and one oxygen atom.
Explanation
Starch is a polymer of $$\alpha-D-Glucose$$, it is a branched structure that has $$1,4$$ and $$1.6$$ glycosidic bond.
Starch is homopolysaccharide.
Sugar obtained from sugarcane and sugarbeet is
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Glucose
0%
Fructose
0%
Galactose
0%
Sucrose
Explanation
A typical sugar beetroot consists of 75.9% water, 2.6% non-sugars, 18.0% sugar and 5.5% pulp. In the sugar fraction, 83.1% is recovered as crystalline sucrose, 12.5% is recovered as molasses.
So the correct option is D.
Role of carbohydrates is to function as
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Catalyst
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Source of energy
0%
Enzyme
0%
Building material
Explanation
Carbohydrates are more suitable for the production of
energy in the body then proteins and fats.
Carbohydrate are also stored in the body cells as
glycogen and are used for the production of energy
whenever required.
Which enzyme converts glucose to ethanol?
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Diesterase
0%
Invertase
0%
Zymase
0%
Both (2) and (3)
Explanation
$$Glucose\rightarrow Ethanol$$
Zymase enzymes can do above conversion.
(catalyzes fermentation of sugar into ethanol & $$CO_2$$).
Cereals are major sources of?
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Carbohydrates
0%
Proteins
0%
Fats
0%
Vitamins
Explanation
Cereals are a staple food and are an important source of energy, carbohydrates, protein, and fibre. Examples of cereals include wheat, oats, quinoa, maize, sorghum, etc.
So, the correct answer is 'Carbohydrates'
Which of the following is not a fat soluble
vitamin?
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Vitamin A
0%
Vitamin B complex
0%
Vitamin D
0%
Vitamin E
Explanation
Fat-soluble vitamins are those which are similar to oil and they do not dissolve in water. Vitamin A, D, E, K are the fat soluble vitamins. Vitamin B complex is not a fat soluble vitamin because it is water soluble. It is a pack of all eight vitamins i.e vitamin B1, B2, B3, B5, B6, B7, B9 and B12. As it is water soluble our body doesn't store it and hence body must be served daily with vitamin B complex.
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