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Biomolecules · Question 10

NEET (UG) 2022MCQEasy📈 Topic in 12% papers+4−1
1

The incorrect statement regarding enzymes is

  1. Enzymes are biocatalysts.
  2. Like chemical catalysts enzymes reduce the activation energy of bio processes.
  3. Enzymes are polysaccharides.
  4. Enzymes are very specific for a particular reaction and substrate.

Answer

(3) Enzymes are polysaccharides.

Solution

As per NCERT, enzymes are biocatalysts; almost all enzymes are globular proteins.

⇒ Like chemical catalysts, enzymes lower the activation energy of biochemical reactions — (2) is correct.

⇒ Enzymes are highly specific for a particular reaction and for a particular substrate — (4) is correct.

∴ 'Enzymes are polysaccharides' is incorrect (they are proteins).

Answer: (3)

NEET (UG) 2022

Keep practising — Biomolecules

2

The incorrect statement about denaturation of proteins is :

  1. Uncoiling of the helical structure takes place
  2. It results due to change of temperature and/or pH
  3. It results in loss of biological activity of proteins
  4. A protein is formed from amino acids linked by peptide bonds
NEET (UG) 2022 (Phase 2)
3

The RBC deficiency is deficiency disease of :

  1. Vitamin B2
  2. Vitamin B12
  3. Vitamin B6
  4. Vitamin B1
Out of syllabusNEET (UG) 2021
4

Which of the following is a basic amino acid?

  1. Alanine
  2. Tyrosine
  3. Lysine
  4. Serine
NEET (UG) 2020
5

Sucrose on hydrolysis gives :

  1. -D-Glucose + -D-Glucose
  2. -D-Glucose + -D-Fructose
  3. -D-Fructose + -D-Fructose
  4. -D-Glucose + -D-Fructose
NEET (UG) 2020
6

The non-essential amino acid among the following is :

  1. alanine
  2. lysine
  3. valine
  4. leucine
NEET (UG) 2019
7

The difference between amylose and amylopectin is

  1. amylopectin have 1 4 -linkage and 1 6 -linkage
  2. amylose have 1 4 -linkage and 1 6 -linkage
  3. amylopectin have 1 4 -linkage and 1 6 -linkage
  4. amylose is made up of glucose and galactose
NEET 2018
8

Which of the following compounds can form a zwitter ion?

  1. Aniline
  2. Acetanilide
  3. Benzoic acid
  4. Glycine
NEET 2018
9

Which of the following statements is not correct?

  1. Ovalbumin is a simple food reserve in egg-white.
  2. Blood proteins thrombin and fibrinogen are involved in blood clotting.
  3. Denaturation makes the proteins more active.
  4. Insulin maintains sugar level in the blood of a human body.
NEET 2017
10

The correct statement regarding RNA and DNA, respectively is

  1. The sugar component in RNA is arabinose and the sugar component in DNA is ribose
  2. The sugar component in RNA is 2'-deoxyribose and the sugar component in DNA is arabinose
  3. The sugar component in RNA is arabinose and the sugar component in DNA is 2'-deoxyribose
  4. The sugar component in RNA is ribose and the sugar component in DNA is 2'-deoxyribose.
NEET 2016 (Phase 1)
11

In a protein molecule various amino acids are linked together by

  1. peptide bond
  2. dative bond
  3. -glycosidic bond
  4. -glycosidic bond.
NEET 2016 (Phase 1)

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