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Biomolecules (Biology) · Question 2

NEET (UG) 2026MCQEasy📈 Topic in 62% papers+4−1
1

The following reaction depicts the activity of a particular class of enzymes : [figure] Identify the enzyme class 'E' from the following options :

  1. Isomerases
  2. Ligases
  3. Transferases
  4. Lyases

Answer

(4) Lyases

Solution

The groups X and Y are removed from the substrate without hydrolysis, and a double bond (C = C) is left behind.

Enzymes that catalyse removal of groups from substrates by mechanisms other than hydrolysis, forming double bonds, are lyases.

Answer: (4)

NEET (UG) 2026

Keep practising — Biomolecules (Biology)

2

Match List-I with List-II.

  1. A-I, B-II, C-III, D-IV
  2. A-I, B-II, C-IV, D-III
  3. A-II, B-I, C-IV, D-III
  4. A-II, B-I, C-III, D-IV
RE-NEET (UG) 2026
3

Arrange the following elements in descending order of their contribution to percentage weight of the human body.

  1. B, A, C, D
  2. A, B, C, D
  3. C, A, B, D
  4. B, C, D, A
RE-NEET (UG) 2026
4

The protein portion of an enzyme is called:

  1. Apoenzyme
  2. Prosthetic group
  3. Cofactor
  4. Coenzyme
NEET (UG) 2025
5

Match List-I with List-II Choose the option with all correct matches.

  1. A-III, B-II, C-I, D-IV
  2. A-II, B-III, C-I, D-IV
  3. A-III, B-IV, C-II, D-I
  4. A-III, B-II, C-IV, D-I
NEET (UG) 2025
6

Which one of the following statements refers to Reductionist Biology?

  1. Chemical approach to study and understand living organisms
  2. Behavioural approach to study and understand living organisms
  3. Physico-chemical approach to study and understand living organisms
  4. Physiological approach to study and understand living organisms
NEET (UG) 2025
7

Which one of the following enzymes contains 'Haem' as the prosthetic group?

  1. Succinate dehydrogenase
  2. Catalase
  3. RuBisCO
  4. Carbonic anhydrase
NEET (UG) 2025
8

Name the class of enzyme that usually catalyses the following reaction : S - G + S' S + S' - G Where, G a group other than hydrogen S a substrate S' another substrate

  1. Transferase
  2. Ligase
  3. Hydrolase
  4. Lyase
NEET (UG) 2025
9

Lecithin, a small molecular weight organic compound found in living tissues, is an example of:

  1. Amino acids
  2. Phospholipids
  3. Glycerides
  4. Carbohydrates
NEET (UG) 2024
10

The cofactor of the enzyme carboxypeptidase is:

  1. Zinc
  2. Niacin
  3. Flavin
  4. Haem
NEET (UG) 2024
11

Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of:

  1. Cofactor inhibition
  2. Feedback inhibition
  3. Competitive inhibition
  4. Enzyme activation
NEET (UG) 2024

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