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Biomolecules (Biology) · Question 15

NEET (UG) 2024MCQEasy📈 Topic in 38% papers+4−1
1

Regarding catalytic cycle of an enzyme action, select the correct sequential steps : Choose the correct answer from the options given below :

  1. E, A, D, C, B
  2. A, E, B, D, C
  3. B, A, C, D, E
  4. E, D, C, B, A

Answer

(1) E, A, D, C, B

Solution

Catalytic cycle of an enzyme:

1. The substrate binds to the active site of the enzyme (E).

2. The enzyme–substrate complex is formed (A).

3. The chemical bonds of the substrate are broken (D).

4. The products are released from the enzyme (C).

5. The free enzyme is ready to bind another molecule of substrate (B).

Sequence: E, A, D, C, B

Answer: (1)

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Keep practising — Biomolecules (Biology)

2

Which of the following is a nucleotide?

  1. Uridine
  2. Adenylic acid
  3. Guanine
  4. Guanosine
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3

Ligases is a class of enzymes responsible for catalysing the linking together of two compounds. Which of the following bonds is not catalysed by it?

  1. C – C
  2. P – O
  3. C – O
  4. C – N
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4

Which of the following are not fatty acids? Choose the correct answer from the options given below :

  1. C, D and E only
  2. A and B only
  3. A, D and E only
  4. B and C only
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5

Which of the following graphs depicts the effect of substrate concentration on velocity of enzyme catalysed reaction?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
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6

Enzymes that catalyse the removal of groups from substrates by mechanisms other than hydrolysis leaving double bonds, are known as :

  1. Transferases
  2. Oxidoreductases
  3. Dehydrogenases
  4. Lyases
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7

Match List-I with List-II. Choose the correct answer from the options given below :

  1. A-III, B-IV, C-II, D-I
  2. A-III, B-II, C-I, D-IV
  3. A-I, B-III, C-II, D-IV
  4. A-IV, B-III, C-II, D-I
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8

Cellulose does not form blue colour with Iodine because

  1. It is a helical molecule
  2. It does not contain complex helices and hence cannot hold iodine molecules
  3. It breaks down when iodine reacts with it
  4. It is a disaccharide
NEET (UG) 2023
9

Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of

  1. Amylase
  2. Lipase
  3. Dinitrogenase
  4. Succinic dehydrogenase
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10

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are false.
  2. Statement I is true but Statement II is false.
  3. Statement I is false but Statement II is true.
  4. Both Statement I and Statement II are true.
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11

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

  1. Both Statement I and Statement II are false.
  2. Statement I is true but Statement II is false.
  3. Statement I is false but Statement II is true.
  4. Both Statement I and Statement II are true.
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