Biomolecules — DPP 2

20 NEET questions from Biomolecules, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
What happen if co-factor is removed from the enzyme?
  1. A Enzyme action declines
  2. B Change the substrate complex
  3. C Catalytic activity of enzyme is lost
  4. D Both (1) & (3) are true
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Correct answer: C

2
$\beta$-pleated sheet organization in a polypeptide chain is an example of :-
  1. A $1 ^ { \circ }$ structure
  2. B $2 ^ { \circ }$ structure
  3. C $3 ^ { \circ }$ structure
  4. D $4 ^ { \circ }$ structure
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Correct answer: B

3
Which of the following is aromatic AA?
  1. A Tyrosine
  2. B Tryptophan
  3. C Phenyl alanine
  4. D All the above
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Correct answer: D

4
Which of the following coenzyme is a derivative of Niacin ?
  1. A NAD
  2. B NADP
  3. C FAD
  4. D Both (A) and (B)
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Correct answer: D

5
If -NH$_{2}$ group and -COOH group are attached on same carbon in any amino acid, then these types of amino acids are known as :
  1. A α-AA
  2. B β-AA
  3. C γ-AA
  4. D All
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Correct answer: A

6
Select the correctly matched.
  1. A Anthocyanins - Alkaloids
  2. B Carotenoids - Toxins
  3. C Ricin - Drugs
  4. D Lemon grass oil - Essential oils
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Correct answer: D

7
Which statement regarding enzyme inhibition is most appropriate?
  1. A Inhibition of succinic dehydrogenase by malonate
  2. B Competitive inhibition occurs when a substrate competes with enzyme for binding to inhibitor protein.
  3. C In Competitive inhibition enzyme show close structural similarity with the inhibitors.
  4. D Non-competitive inhibitors compete with substrate for binding the enzyme.
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Correct answer: A

8
(i) Transient association with the protein part of conjugated enzyme
(ii) Non protein organic substance
(iii) Usually made up of vitamins
All the above characters are applicable to :-
  1. A Apoenzyme
  2. B Holoenzyme
  3. C Coenzyme
  4. D Isoenzyme
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Correct answer: C

9
Enzyme were discovered for the first time by:
  1. A Sumner
  2. B Buchner
  3. C Kuhne
  4. D None of the above
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Correct answer: B

10
Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?
Biomolecules – NEET-1921
  1. A B : adenine - a nucleotide that makes up nucleic acids
  2. B A : Triglyceride - major source of energy
  3. C B : Uracil - a component of DNA
  4. D A : Lecithin - a component of cell membrane
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Correct answer: D

11
What is the R group in Glycine?
  1. A $- \mathrm { CH } _ { 2 } - \mathrm { OH }$
  2. B - H
  3. C $- \mathrm { CH } _ { 3 }$
  4. D None of them
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Correct answer: B

12
Inorganic catalysts work efficiently at high temperatures while enzymes get damaged at high temperatures (above $40 ^ { \circ } \mathrm { C }$ ). This feature of enzymes in not applicable to :-
  1. A the enzymes which are made up of proteins
  2. B The enzymes isolated from thermophobic organisms
  3. C the enzymes which have active sites
  4. D the enzymes of organisms who live in hot vents
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Correct answer: D

13
Which of the following statements is correct?
  1. A All the proteins are enzymes
  2. B All enzymes are proteins
  3. C Almost all enzymes are proteins
  4. D All enzymes are nucleic acids
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Correct answer: C

14
Which of the following is correctly matched ?
  1. A Mannose = 6 carbons sugar
  2. B Erythrose = 4 carbons sugar
  3. C Arabinose = 5 carbons sugar
  4. D All
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Correct answer: D

15
An example of competitive inhibition is :
  1. A Succinic dehydrogenase by malonic acid
  2. B Cytochrome oxidase by cyanide
  3. C Hexokinase by glucose - 6 phosphate
  4. D Carbonic anhydrase by carbon - dioxide
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Correct answer: A

16
A competitive inhibitor of succinic dehydrogenase is :-
  1. A $\alpha$-ketoglutarate
  2. B Malate
  3. C Malonate
  4. D Oxaloacetate
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Correct answer: C

17
Amylose and Amylopectin chains occur in-
  1. A Glycogen
  2. B Starch
  3. C Cellulose
  4. D Chitin
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Correct answer: B

18
(i) Temperature, pH and concentration of substrate can influence enzyme activity.
(ii) ES complex is short lived
(iii) In exothermic reaction, the energy level of " P " is lower than " S " substrate
(iv) Cofactors play a crucial role in the catalytic activity of the enzyme.
Which of the above statements are correct?
  1. A only i, iii and iv
  2. B only ii and iv
  3. C only i, ii and iv
  4. D i, ii, iii and iv
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Correct answer: D

19
Which of the following is not a hydrolase enzyme ?
  1. A Protease
  2. B Lipase
  3. C Mutase
  4. D Carbohydrase BBM360
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Correct answer: C

20
Select the type of enzyme involved in following reaction is :-
Biomolecules – NEET-2617
  1. A Oxidoreductases
  2. B Transferases
  3. C Lyases
  4. D Hydrolases
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Correct answer: C

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