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Biomolecules (Biology) · Question 42

NEET (UG) 2019MCQEasy📈 Topic in 62% papers+4−1
1

Consider the following statements: Select the correct option

  1. Both A and B are false
  2. A is false but B is true
  3. Both A and B are true
  4. A is true but B is false

Answer

(4) A is true but B is false

Solution

As per NCERT, prosthetic groups are organic compounds that are tightly bound to the apoenzyme (e.g., haem in peroxidase and catalase); metal ions such as Zn2+ in carboxypeptidase are also tightly bound cofactors. ⇒ Statement A is true.

The catalytically active enzyme together with its bound cofactor is called the holoenzyme; the protein portion alone (without the cofactor) is the apoenzyme. ⇒ Statement B is false.

Answer: (4)

NEET (UG) 2019

Keep practising — Biomolecules (Biology)

2

The two functional groups characteristic of sugars are

  1. carbonyl and methyl
  2. carbonyl and hydroxyl
  3. hydroxyl and methyl
  4. carbonyl and phosphate
NEET 2018
3

Which of the following statements is correct with reference to enzymes?

  1. Holoenzyme = Apoenzyme + Coenzyme
  2. Coenzyme = Apoenzyme + Holoenzyme
  3. Holoenzyme = Coenzyme + Co-factor
  4. Apoenzyme = Holoenzyme + Coenzyme
NEET 2017
4

Which of the following are not polymeric?

  1. Proteins
  2. Polysaccharides
  3. Lipids
  4. Nucleic acids
NEET 2017
5

A typical fat molecule is made up of

  1. one glycerol and one fatty acid molecule
  2. three glycerol and three fatty acid molecules
  3. three glycerol molecules and one fatty acid molecule
  4. one glycerol and three fatty acid molecules.
NEET 2016 (Phase 1)
6

Which one of the following statements is wrong?

  1. Uracil is a pyrimidine.
  2. Glycine is a sulphur containing amino acid.
  3. Sucrose is a disaccharide.
  4. Cellulose is a polysaccharide.
NEET 2016 (Phase 1)
7

A non-proteinaceous enzyme is

  1. lysozyme
  2. ribozyme
  3. ligase
  4. deoxyribonuclease.
NEET 2016 (Phase 2)
8

Which of the following is the least likely to be involved in establishing the three-dimensional folding of most proteins?

  1. Hydrogen bonds
  2. Electrostatic interaction
  3. Hydrophobic interaction
  4. Ester bonds
NEET 2016 (Phase 2)
9

Which of the following describes the given graph correctly? [figure]

  1. Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
  2. Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
  3. Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
  4. Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
NEET 2016 (Phase 2)
10

The chitinous exoskeleton of arthropods is formed by the polymerisation of

  1. N-acetyl glucosamine
  2. lipoglycans
  3. keratin sulphate and chondroitin sulphate
  4. D-glucosamine.
AIPMT 2015
11

Which of the following biomolecules does have a phosphodiester bond?

  1. Amino acids in a polypeptide
  2. Nucleotides in a nucleic acid
  3. Fatty acids in a diglyceride
  4. Monosaccharides in a polysaccharide
AIPMT 2015

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