CBSE Questions for Class 12 Engineering Chemistry Biomolecules Quiz 6 - MCQExams.com

Which 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 acids.
  • In cyclic structure of furanose, there are four carbon atoms and one oxygen atom.
Vitamin $${B}_{1}$$ is :
  • Riboflavin
  • Cobalamin
  • Thiamine
  • Pyridoxine
A disaccharide consists of two mono saccharides joined by _____ bonds.
  • glycoside
  • sucrose
  • fructose
  • both A and B
Which of the following statements are correct?
  • One mole of $$PhNH{NH}_{2}$$ reacts with $$3$$ mol glucose to form osazone
  • One mole of D-fructose reacts with $$3$$ mol $$PhNH{NH}_{2}$$ to form osazone
  • One mole of D-2-deoxy glucose reacts with $$1$$ mol $$PhNH{NH}_{2}$$ to form phenylhyrazone
  • One mole of D-3-deoxy glucose reacts with $$3$$ mol $$PhNH{NH}_{2}$$ to form osazone
Which statements are correct?
  • Lactose is a disaccharide and is a reducing sugar
  • $$\alpha$$$$-D-glucopyranoside$$ has an acetal structure and is non-reducing sugar
  • $$Methyl-$$$$\alpha$$$$-D-glucopyranose$$ has an acetal structure and is a non-reducing sugar
  • $$\alpha$$$$-D-Glucopyranose$$ has a hemiacetal structure and is a reducing sugar
All enzymes are?
  • Carbohydrates
  • Proteins
  • Minerals
  • Vitamins
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
Complete hydrolysis of starch gives:
  • glucose and galactose in equimolar amounts
  • galactose and fructose in equimolar amounts
  • glucose only
  • glucose and fructose in equimolar amount
Which of the following carbohydrates develop blue colour on treatment with iodine solution?
  • Glucose
  • Sorbose
  • Starch
  • Fructose
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
Which of the vitamins given below is water soluble?
  • Vitamin $$C$$
  • Vitamin $$D$$
  • Vitamin $$E$$
  • Vitamin $$K$$
Enzymes are found in all living cell. Their main functions is
  • To help in the digestion of food
  • To allow chemical to food reaction
  • To speed up the break down of substance
  • To accelerate the rate of chemical reactions
Which one of the following is not a pyrimidine base ? 
  • Thymine
  • Guanine
  • Cytosine
  • Uracil
Blood calcium is increased by administration of
  • Glucagon
  • Thyroxine
  • Parathormone
  • Calcitonin
______________ are found in nitrates, phosphates of metals.
  • Inorganic impurities
  • Organic impurities
  • Nutrients
  • Bacteria
The chemical name of vitamin $${B}_{12}$$ is:
  • Calciferol
  • Tocopherol
  • Pyridoxine
  • Cyanocobalamine
Identify disaccharides among the following:

(a) Stachyose            (b) Lactose
(c) Maltose               (d) Raffinose
  • $$a, b$$
  • $$ d, e$$
  • $$b, e$$
  • $$b, c$$
An apoenzyme is a
  • Protein
  • Lipid
  • Sugar
  • Vitamin
Which of the following is a pentose sugar ?
  • Glucose
  • Fructose
  • Ribose
  • Cellulose
The enzymes are destroyed by
  • Cooling
  • Heating
  • Drying
  • None of the above
Carbohydrates mix directly with blood and supply energy to the cells.
  • True
  • False
One mole of stachyose on hydrolysis yields:
  • 1 mole of glucose + 1 mole of fructose + 2 mole of galactose
  • 2 mole of glucose + 1 mole of fructose + 1 mole of galactose
  • 1 mole of glucose + 2 mole of fructose + 1 mole of galactose
  • 2 mole of glucose + 2 mole of fructose
The enzymes are substances which
  • Are broken into simpler substances during digestion
  • Are made by the combination of carbohydrates
  • Break complexfood molecules into simpler food molecules
  • Break complex substances and they themselves undergo dissociation reactions
White prepipitate is formed in.
  • Millon's test
  • Ninhydrin test
  • Biuret test
  • Xanthoprotic test
Apoenzyme is a
  • Protein
  • Carbohydrate
  • Vitamin
  • Amino acid
Which of the following is correct?
  • Catalyst undergoes permanent chemical change.
  • Particle size of solute in true solution is $$10^{-3}$$m.
  • Starch solution is a hydrosol.
  • Hydrolysis of liquid ester in the presence of mineral acid is an example of heterogeneous catalysis reactions.
The enzymes that catalyse endergonic synthesis, coupled with exergonic hydrolysis of ATP are
  • Ligases
  • Isomerases
  • Lyases
  • Transferases
Which one is true for ATP?
  • ATP is prosthetic part of an enzyme
  • ATP is an enzyme
  • ATP is organic ions of enzyme
  • ATP is a Co-enzyme
The general molecular formula for disaccharide is:
  • $${ C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 }$$
  • $${ C }_{ 10 }{ H }_{ 20 }{ O }_{ 10 }$$
  • $${ C }_{ 12 }{ H }_{ 20 }{ O }_{ 10 }$$
  • $${ C }_{ 12 }{ H }_{ 22 }{ O }_{ 10 }$$
Sucrose on hydrolysis gives:
  • glucose and maltose
  • glucose and lactose
  • glucose and fructose
  • only glucose
Glucose on oxidation gives the acid containing the C-chiral atoms equal to:
  • 2
  • 3
  • 4
  • 5
The study of the energy transfer and relationships between all living organisms is known as
  • Thermodynamics
  • Bioenergetics
  • Kinetic energy
  • Potential energy
The bases that are common in both RNA and DNA are:
  • adenine, guanine, thymine
  • adenine, uracil, cytosine
  • adenine, guanine, cytosine
  • guanine, uracil, thymine
All of the following is true about enzymes except_______________.
  • Activity of enzymes remains unaffected by genetic mutation
  • Enzymes may interact with non-protein molecules in order to engage in biological activity
  • Enzymes optimally operate at a particular pH
  • Enzymes optimally operate at a particular temperature
  • Enzymes are almost always proteins
Which of the following is true for enzymes?
I. They are proteins.
II. Typically work best at pH 7.2.
III. They are changed during a reaction.
IV. They are formed in the nucleus only.
  • I only
  • II only
  • I and II only
  • I,II and III only
  • I, II,III and IV
Bile salts act as an activator of which enzyme?
  • Pepsinogen
  • Trypsinogen
  • Lipase
  • Pancreatic amylase
All of the following statements is correct except
  • Enzymes are made from proteins.
  • One enzyme can facilitate the reaction of many different substrates.
  • Enzymes sometimes use induced fits to break apart their substrates.
  • Enzymes are not required for spontaneous reactions.
  • Not all catalysts are enzymes.
Name the factor which will not affect the enzyme activity with a limited amount of chemical substrate.
  • pH level
  • Inhibitors
  • Temperature
  • Enzyme cofactors
  • Enzyme concentration
Choose the correct statement about enzymes.
  • They always work alone.
  • They are consumed in a reaction.
  • They are amino acid polymers.
  • They always require a coenzyme.
  • They are classified as inorganic catalysts.
Which one is the cofactor of carbonic anhydrase?
  • Fe
  • Zn
  • Cu
  • Mg
During a biochemical reaction, an enzyme
  • Becomes part of the product
  • Remains unchanged
  • Broken down into amino acids
  • Reacts with fatty acids
  • Becomes a polypeptide
Helicase enzyme is responsible for the breakage of 
I. Covalent bonds
II. Hydrogen bonds
III. Ionic bonds
  • I only
  • II only
  • III only
  • I and II
  • I, II, and III
Which of the following is not true for enzymes?
  • Enzymes lower the activation energy barrier of a reaction.
  • Enzymes are made up of proteins.
  • Enzymes are used up in reactions.
  • Enzymes can be affected by changes in temperature.
  • Enzymes contain an active site.
Which of the following is a polysaccharide?
  • Starch
  • Maltose
  • Lactose
  • Arabinose
One way of defining or identifying carbohydrates is to say that they can be described by the general formula, $$C_{m}(H_{2}O)_{n}$$, where m and n may or may not be the same integer.
Of the four structures displayed in the figure above, which one does NOT fit this definition of a carbohydrate?
526450_8d99a84d4dbc4094876d3af561881878.png
  • I
  • II
  • III
  • IV
Carbohydrates contain hydrogen and oxygen atoms in the ratio of ____________.
  • 1:1
  • 2:1
  • 2:3
  • 1:2
Antibodies recognize and bind to antigens in a manner similar to the interaction between enzyme and substrate. Which of the following are evident in this type of interaction?
  • Covalent bonds
  • Disulfide bonds
  • Hydrogen bonds
  • Peptide bonds
Which of the following is a disaccharide?
  • Sucrose
  • Maltose
  • Lactose
  • All of the above
Coenzyme is :
  • the non-protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity
  • the protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity
  • the non-protein or protein component of an enzyme which is loosely held by the enzyme and necessary for its biological activity
  • none of these
One way of defining or identifying carbohydrates is to say, that they can be described by the general formula, $$C_{m}(H_{2}O)_{n}$$, where m and n may or may not be the same integer.
Of the four structures displayed in the figure above, which one does NOT fit this definition of a carbohydrate?
528567.jpg
  • I
  • II
  • III
  • IV
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