This practice test includes 25 important multiple-choice objective questions from the chapter Biomolecules Class 11th.
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Q.1.
Feedback inhibition of enzymes is affected by which of the following
- enzyme
- substrate
- end products
- intermediate end products
Answer:
(c) end products
Explanation: end products
Explanation: end products
Q.2.
An example of competitive inhibition of an enzyme is the inhibition of
- succinic dehydrogenase by malonic acid
- cytochrome oxidase by cyanide
- hexokinase by glucose-6-phosphate
- carbonic anhydrase by carbon dioxide
Answer:
(a) succinic dehydrogenase by malonic acid
Explanation: succinic dehydrogenase by malonic acid
Explanation: succinic dehydrogenase by malonic acid
Q.3.
Insulin is made up of _______ and _______.
- glucose and fructose
- glucose and fructose
- fructose and mannose
- mannose and glucose
Answer:
(b) glucose and fructose
Explanation: Insulin is a polysaccharide made up of glucose and fructose.
Explanation: Insulin is a polysaccharide made up of glucose and fructose.
Q.4.
Enzymes increase the rate of reaction by
- lowering activation energy
- increasing activation energy
- increasing temperature and pH
- decreasing temperature and pH
Answer:
(a) lowering activation energy
Explanation: Enzymes increase the rate of reaction by decreasing the activation energy.
Explanation: Enzymes increase the rate of reaction by decreasing the activation energy.
Q.5.
Which of the following statements regarding enzyme inhibition is correct?
- Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
- Non-competitive inhibitors often bind to the enzyme irreversibly
- Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
- Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
Answer:
(c) Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Explanation: Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Explanation: Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Q.6.
Which of the following is not a pyrimidine?
- Uracil
- Cytosine
- Guanine
- Thymine
Answer:
(c) Guanine
Explanation: Guanine is a purine.
Explanation: Guanine is a purine.
Q.7.
Hydrolysis of starch occurs with the help of
- Peptidase
- Amylase
- Sucrose
- Lipase
Answer:
(b) Amylase
Explanation: Amylase
Explanation: Amylase
Q.8.
Assertion: Arachidic acid is an unsaturated fatty acid Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids
- Both Assertion and Reason are true and Reason is the correct explanation of the Assertion
- Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion
- Assertion is true, but Reason is false.
- Both Assertion and Reason are false
Answer:
(d) Both Assertion and Reason are false
Explanation: Both Assertion and Reason are false
Explanation: Both Assertion and Reason are false
Q.9.
Which of the following influence feedback inhibition of enzyme?
- End product
- External factors
- Enzyme
- Substrate
Answer:
(a) End product
Q.10.
Which of the following is not a polysaccharide?
- Lactose
- Starch
- Glycogen
- Dextrin
Answer:
(a) Lactose
Explanation: Lactose is a disaccharide made up of glucose and galactose.
Explanation: Lactose is a disaccharide made up of glucose and galactose.
Q.11.
Inulin is made up of _______ and _______
- glucose and fructose
- glucose and fructose
- fructose and mannose
- mannose and glucose
Answer:
(b) glucose and fructose
Explanation: Inulin is a polysaccharide made up of glucose and fructose
Explanation: Inulin is a polysaccharide made up of glucose and fructose
Q.12.
A protein having both structural and enzymatic traits is
- Collagen
- Trypsin
- Myosin
- Actin
Answer:
(c) Myosin
Explanation: Myosin
Explanation: Myosin
Q.13.
NADP contains vitamin ______
- B1
- B2
- B3
- B12
Answer:
(c) B3
Explanation: B3 also named as niacin.
Explanation: B3 also named as niacin.
Q.14.
With reference to enzymes, which one of the following statements is true?
- Apoenzyme = Holoenzyme + Coenzyme
- Coenzyme = Apoenzyme + Holoenzyme
- Holoenzyme = Apoenzyme + Coenzyme
- Holoenzyme = Coenzyme ? Apoenzyme
Answer:
(b) Coenzyme = Apoenzyme + Holoenzyme
Explanation: Holoenzyme = Apoenzyme + Coenzyme
Explanation: Holoenzyme = Apoenzyme + Coenzyme
Q.15.
Inhibitor binds to the active site of the enzyme. Hence blocking the reaction. This is an example of
- allosteric inhibition
- feedback inhibition
- uncompetitive inhibition
- competitive inhibition
Answer:
(d) competitive inhibition
Explanation: When substrate binds to the active site of the enzyme, it completes the reaction.When inhibitor binds to the active site of the enzyme, it blocks the reaction
Explanation: When substrate binds to the active site of the enzyme, it completes the reaction.When inhibitor binds to the active site of the enzyme, it blocks the reaction
Q.16.
The fastest enzyme known is
- DNA polymerase
- carbonic anhydrase
- carbonic dehydrogenase
- DNA ligase
Answer:
(b) carbonic anhydrase
Explanation: The fastest enzyme known is carbonic anhydrase. It converts 106 molecules of carbon dioxide molecules per second.
Explanation: The fastest enzyme known is carbonic anhydrase. It converts 106 molecules of carbon dioxide molecules per second.
Q.17.
Lecithin is a
- polysaccharide
- protein
- nucleic acid
- lipid
Answer:
(d) lipid
Explanation: Lecithin is a phospholipid.
Explanation: Lecithin is a phospholipid.
Q.18.
The minimum amount of energy required to initiate a chemical reaction is called
- enzymatic energy
- activation energy
- substrate energy
- initiation energy
Answer:
(b) activation energy
Explanation: The minimum amount of energy required to initiate a chemical reaction is called activation energy
Explanation: The minimum amount of energy required to initiate a chemical reaction is called activation energy
Q.19.
Enzymes, vitamins and hormones are common in
- Enhancing oxidative metabolism
- Being synthesised in the body of organisms
- Being proteinaceous
- Regulating metabolism
Answer:
(d) Regulating metabolism
Q.20.
Nitrogenous bases present in DNA
- Adenine, guanine, cytosine, uracil
- Adenine, guanine, cytosine, thymine
- Adenine, thymine, uracil
- Guanine, uracil
Answer:
(b) Adenine, guanine, cytosine, thymine
Explanation: Adenine, guanine, cytosine, thymine
Explanation: Adenine, guanine, cytosine, thymine
Q.21.
Metabolic intermediates found in living system which are essential for growth and life is called___________
- Saponins
- Tannins
- Secondary metabolite
- Primary metabolites
Answer:
(d) Primary metabolites
Explanation: Primary metabolites
Explanation: Primary metabolites
Q.22.
Enormous diversity of protein molecules is due to
- R groups of amino acids
- Sequence of amino acids
- Peptide bonds
- Amino groups of amino acids
Answer:
(b) Sequence of amino acids
Explanation: Sequence of amino acids
Explanation: Sequence of amino acids
Q.23.
Anti-parallel strands of a DNA molecule mean that
- One strand turns anticlockwise
- Phosphate groups at the start of two DNA strands (poles) are in opposite position
- Phosphate groups of two DNA strands at their ends share the same position
- One strand turns clockwise
Answer:
(b) Phosphate groups at the start of two DNA strands (poles) are in opposite position
Explanation: Phosphate groups at the start of two DNA strands (poles) are in opposite position
Explanation: Phosphate groups at the start of two DNA strands (poles) are in opposite position
Q.24.
The introduction of t-DNA into plants involves
- Altering the pH of the soil, then heat shocking the plants
- Exposing the plants to cold for a brief period
- Allowing the plant roots to stand in water
- Infection of the plant by Agrobacterium tumefaciens
Answer:
(d) Infection of the plant by Agrobacterium tumefaciens
Q.25.
The most common monomer of carbohydrates is
- Sucrose
- Fructose
- Maltose
- Glucose
Answer:
(d) Glucose
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