CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 8 - MCQExams.com

Baking powder is more commonly used to make cakes or bread "rise". Filler in baking powder is:
  • $$NaHCO_3$$
  • $$Ca(H_2PO_4)_2 $$
  • starch
  • $$NaAl(SO_4)_2$$
 Which vitamin is not obtained from plants ?
  • Cyanocobalamine
  • Thiamine
  • Pyridoxine
  • $$\alpha-$$ tocopherol
The vitamin which is neither soluble in water nor in fat is:
  • Biotin
  • Phylloquinone
  • Thiamine
  • Pyridoxine
A peptide hormone is:
  • estrone
  • testosterone
  • insulin
  • corticoid
The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA ?
  • 1st
  • 2nd
  • 3rd
  • 4th
Intermediate common to fatty acid and carbohydrate oxidation is ______________.
  • Pyruvate
  • Acetyl CoA
  • Oxaloaxetate
  • Succinate
Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?
  • D-glucose, D-fructose and D-galactose
  • D-glucose, D-fructose and D-mannose
  • D-glucose, D-mannose and D-galactose
  • D-fructose, D-mannose and D-galactose
Which of the following is the correct statement ?
  • Starch is a polymer of $$\alpha$$-glucose
  • Amylose is a component of cellulose
  • Proteins are composed of only one type of amino acid
  • In cyclic structure of fructose, there are four carbons and one oxygen atom
Many pathogens produce cellulolytic, enzymes which act upon the host cell wall. The correct sequence of the given cellulolytic enzymes that are involved in the breakdown of cellulose is?
  • Cellobiase, $$C_1$$ enzyme, Cx enzyme
  • Cellobiase, Cx enzyme, $$C_1$$ enzyme
  • $$C_1$$ enzyme, Cx enzyme, Cellobiase
  • Cx enzyme, $$C_1$$ enzyme, Cellobiase
The number of moles of substrate converted per minute by one mole of enzyme is called.
  • Turnover number
  • Substrate number
  • Enzyme number
  • Peptide number
Consider the following statements about enzymes.
a. Most enzymes are proteinaceous, although some are RNA molecules
b. The specificity of an enzyme is due to its well-defined three dimensional structure and the active site present in it.
c. Prosthetic group is loosely bound to the apoenzyme part of the enzyme.
d. Portions, prosthetic group and apoenzyme are enzymatically inactive when separated from each other.
Pick the correct ones from these statements.
  • $$1, 2$$ and $$3$$ are correct
  • $$1, 3$$ and $$4$$ are correct
  • $$1, 2$$ and $$4$$ are correct
  • $$2, 3$$ and $$4$$ are correct
A $$25,000$$ Da protein contains a single binding site for a molecule(ligand), whose molecular weight is $$2,500$$Da. Assuming high affinity and physiologically irreversible binding, the amount of the liquid required to occupy all the binding sites in $$10$$mg protein will be
  • $$0.1$$mg
  • $$1$$mg
  • $$10$$mg
  • $$100$$mg
Enzymes play an essential role in the body because ________.
  • they provide energy
  • they control nervous system
  • these are the structural part of body
  • these are the catalyst of biochemical activity
On hydrolysis of starch, we finally get:
  • Glucose
  • Fructose
  • Both (a) and (b)
  • Sucrose
From the following substances, which carbohydrates has the maximum sweetness?
  • Sucrolose
  • Saccharin
  • Aspartme
  • Alitame
$${Q}_{10}$$ value for enzyme is generally found to be____________.
  • $$1$$
  • $$2$$
  • $$4$$
  • $$5$$
Which of the following is NOT an enzyme?
  • Lipase
  • Amylase
  • Trypsin
  • Bilirubin
Name the main constituent of the food, in the absence of that one cannot live
  • Carbohydrates
  • Mineral salts
  • Proteins
  • Vitamins
Various types of crystals of calcium carbonate or oxalate are reported in certain families which can also be regarded as aid to taxonomy. Crystals of gypsum are present either singly or in clusters in
  • Tomarix dioica
  • Ficus benghalensis
  • Momordica charantia
  • Nymphaea sp.
Which cell organelle is not correctly associated with an appropriate enzyme or protein?
  • Mitochondria-cytochrome C
  • Rough endoplasmic reticulum-ribosomes
  • Peroxisomes-catalase
  • Nuclear membrane-amino acid permease
Enzymes differ from inorganic catalysts in
  • Not being used up in chemical reactions
  • Working at high.temperature
  • Being proteinaceous in nature
  • Working at high pH
The catalytic power of enzyme is represented by :-
  • $${ V }_{ max }$$
  • $${ K }_{ m }$$ constant
  • Turn over number
  • Both (2) & (3)
Which one of the following is not an attribute of enzymes?
  • They are specific in nature
  • They are used in chemical reactions
  • They are thermolabile in nature
  • They are proteinaceous in nature
The three $$p{K}_{a}$$ values of aspartic acid are 1.89, 3.65 and 9.The pH of the amino acid is ?
  • 2.77
  • 6.62
  • 5.74
  • 7.0
Carbohydrates are ___________.
  • used to make a paper
  • produced as an intermediate in the synthesis of proteins
  • the polyhydroxy aldehyde or polyhydroxy ketone
  • all of these
Peristent nucellus is called as _________ and is found in _________.
  • Perisperm, black pepper
  • Perisperm, groundnut
  • Endosperm, black pepper
  • Endosperm, groundnut
Which of the following is not the example of carbohydrate?
  • Glucose
  • Maltose
  • Glycine
  • Fructose
The general formula of carbohydrates is:
  • $${C}_{n}{H}_{2n+1}O$$
  • $${C}_{n}{H}_{2n}O$$
  • $${C}_{n}{({H}_{2}O)}_{n}$$
  • $${C}_{n}{({H}_{2}O)}_{2n}$$
Starch is made by photosynthesis in the leaves of plants. It is found in rice, potatoes, and many vegetables sources. It can be detected with a drop of iodine. In the presence of starch, iodine:
  • vapourises
  • turns blue
  • decolourises
  • turns into a black solid
Carbohydrates contains carbon, hydrogen, and oxygen molecules.
  • True
  • False
Which carbon atom of deoxy Ribose sugar in DNA does NOT contain $$-\overset{|}{\underset{|}{C}}-OH$$ bond?
  • $$C_5$$
  • $$C_3$$
  • $$C_2$$
  • $$C_1$$
Which of the following treatment will convert starch directly into glucose?
  • Heating with dilute $${H}_{2}{SO}_{4}$$
  • Fermentation by diastase
  • Fermentation by zymase
  • Heating with dilute $$NaOH$$
Which of the following reactions is not enzyme-mediated in biological system?
  • Dissolving $$CO_2$$ in water
  • Unwinding the two strands of DNA
  • Hydrolysis of sucrose
  • Formation of peptide bond
A compound which contains both ______ and ______ is called amino acid. The amino acids in polypeptide chain are joined by ______ bonds.
  • amino, carboxylic group, ester
  • amino, carboxylic group, peptide
  • nitrogen, carbon, glycosidic
  • hydroxy, carboxylic group, peptide
The $$\alpha$$ amino acid which contains the aromatic side chain is:
  • proline
  • tyrosine
  • valine
  • serine
Vitamin C must be supplied regularly in diet because ?
  • it is water soluble hence excreted in urine and can't be stored in the body
  • it is fat soluble hence stored in the body and cannot be used on regular basis
  • it is required in a large amount by the body hence supplied regularly
  • it is water soluble hence used by the body on daily basis and is to be suppled regularly
Bases common to RNA and DNA are?
  • adenine, guanine, cytosine
  • adenine, uracil, cytosine
  • adenine, guanine, thymine
  • guanine, uracil, thymine
What is the basic formula for starch?
  • $${ \left( { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 } \right) }_{ n }$$
  • $${ \left( { C }_{ 6 }{ H }_{ 10 }{ O }_{ 5 } \right) }_{ n }$$
  • $${ \left( { C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 } \right) }_{ }$$
  • $${ \left( { C }_{ 6 }{ H }_{ 12 }{ O }_{ 4 } \right) }_{ n }$$
Which of the following is not true about amino acids?
  • They are constituents of all proteins
  • Alanine having one amino and one carboxylic group
  • Most naturally occurring amino acids have D-configuration
  • Glycine is the only naturally occurring amino acid which is optically inactive
Match the name of vitamins in column I with their sources in column II and mark the appropriate choice. 
Column IColumn II
(A) Vitamin $${B}_{1}$$(i) Milk, yeast, cereals
(B) Vitamin $${B}_{12}$$(ii) Meat, fish, egg
(C) Vitamin A(iii) Carrots, butter, papaya
(D) Vitamin C(iv) Citrus fruits, amla, green leafy vegetables
  • (A) $$\rightarrow$$ (iii), (B) $$\rightarrow$$ (iv), (C) $$\rightarrow$$ (i), (D) $$\rightarrow$$ (ii)
  • (A) $$\rightarrow$$ (ii), (B) $$\rightarrow$$ (i), (C) $$\rightarrow$$ (iii), (D) $$\rightarrow$$ (iv)
  • (A) $$\rightarrow$$ (iv), (B) $$\rightarrow$$ (iii), (C) $$\rightarrow$$ (ii), (D) $$\rightarrow$$ (i)
  • (A) $$\rightarrow$$ (i), (B) $$\rightarrow$$ (iii), (C) $$\rightarrow$$ (ii), (D) $$\rightarrow$$ (iv)
Vitamin $${B}_{2}$$, a water soluble vitamin is also known as:
  • ascorbic acid
  • riboflavin
  • thiamine
  • pyridoxine
Which is a fat-soluble vitamin?
  • Vitamin A
  • Vitamin $${B}_{6}$$
  • Vitamin C
  • Vitamin $${B}_{2}$$
If one strand of DNA has the sequence ATGCTTGA, the sequence in the complementary strand would be:
  • TCCGAACT
  • TACGTAGT
  • TACGAATC
  • TACGAACT
Consider the given compound and arrange X, Y, Z in order of increasing acid strengths?
935994_a90bc2257191463b8989bf8f65974c42.png
  • X> Z> Y
  • Z> X> Y
  • X> Y> Z
  • Y> X> Z
Which of the following acids is a vitamin?
  • Aspartic acid
  • Ascorbic acid
  • Adipic acid
  • Saccharic acid
Match column I with column II and mark the appropriate choice.
Column IColumn II
(A) Pentise sugar in DNA(i) Ascorbic acid
(B) Nucleic acid(ii) Uracil
(C) RNA(iii) Genetic material
(D) Vitamin(iv) Furanose structure
  • (A) $$\rightarrow$$ (iv); (B) $$\rightarrow$$ (iii); (C) $$\rightarrow$$ (ii); (D) $$\rightarrow$$ (i)
  • (A) $$\rightarrow$$ (iii); (B) $$\rightarrow$$ (ii); (C) $$\rightarrow$$ (iv); (D) $$\rightarrow$$ (i)
  • (A) $$\rightarrow$$ (ii); (B) $$\rightarrow$$ (iii); (C) $$\rightarrow$$ (iv); (D) $$\rightarrow$$ (i)
  • (A) $$\rightarrow$$ (i); (B) $$\rightarrow$$ (ii); (C) $$\rightarrow$$ (iii); (D) $$\rightarrow$$ (iv)
Which of the following pairs form the same osazone?
  • Glucose and Fructose
  • Glucose and Galactose
  • Glucose and Arabinose
  • Lactose and Maltose
Within the list shown below, the correct pair of structures of alanine in $$pH$$ range $$2-4$$ and $$9-11$$ is:
I. $${H}_{3}{N}^{+}CH({CH}_{3}){CO}_{2}H$$
II. $${H}_{2}NCH({CH}_{3}){CO}_{2}^{-}$$
III. $${H}_{3}{N}^{+}CH({CH}_{3}){CO}_{2}^{-}$$
IV. $${H}_{2}NCH({CH}_{3}){CO}_{2}H$$
  • I, II
  • I, III
  • II, III
  • III, IV
In disaccharides, if the reducing groups of monosaccharides i.e. aldehydic or ketoinc groups are bonded, these are non-reducing sugars. Which of the following disaccharides is a non-reducing sugar?
Which substance is not present in nucleic acids?
  • Cytosine
  • Adenine
  • Thymine
  • Guanidine
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers