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Biomolecules · Question 18

NEET 2017MCQEasy📈 Topic in 25% papers+4−1
1

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.

Answer

(3) Denaturation makes the proteins more active.

Solution

As per NCERT, when a protein in its native form is subjected to a physical change (change in temperature) or a chemical change (change in pH), its hydrogen bonds are disturbed; globules unfold and helices get uncoiled, and the protein loses its biological activity. This is called denaturation.

∴ Denaturation makes proteins less active (inactive), not more active.

Ovalbumin is the food-reserve protein of egg-white, thrombin and fibrinogen take part in blood clotting, and insulin maintains the blood sugar level — these are correct.

Answer: (3)

NEET 2017

Keep practising — Biomolecules

2

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)
3

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)
4

Which one given below is a non-reducing sugar?

  1. Glucose
  2. Sucrose
  3. Maltose
  4. Lactose
NEET 2016 (Phase 1)
5

The central dogma of molecular genetics states that the genetic information flows from

  1. Amino acids Proteins DNA
  2. DNA Carbohydrates Proteins
  3. DNA RNA Proteins
  4. DNA RNA Carbohydrates
NEET 2016 (Phase 2)
6

The correct corresponding order of names of four aldoses with configuration given below [figure] respectively, is

  1. L-erythrose, L-threose, L-erythrose, D-threose
  2. D-threose, D-erythrose, L-threose, L-erythrose
  3. L-erythrose, L-threose, D-erythrose, D-threose
  4. D-erythrose, D-threose, L-erythrose, L-threose
NEET 2016 (Phase 2)
7

Which of the following hormones is produced under the condition of stress which stimulate glycogenolysis in the liver of human beings?

  1. Thyroxine
  2. Insulin
  3. Adrenaline
  4. Estradiol
AIPMT 2014
8

D(+)-glucose reacts with hydroxylamine and yields an oxime. The structure of the oxime would be

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2014
9

In DNA, the linkages between different nitrogenous bases are

  1. phosphate linkage
  2. H-bonding
  3. glycosidic linkage
  4. peptide linkage
NEET 2013 (Karnataka)
10

Deficiency of vitamin B1 causes the disease

  1. convulsions
  2. beri-beri
  3. cheilosis
  4. sterility
AIPMT 2012 (Prelims)
11

Which one of the following sets of monosaccharides forms sucrose?

  1. -D-galactopyranose and -D-glucopyranose
  2. -D-glucopyranose and -D-fructofuranose
  3. -D-glucopyranose and -D-fructofuranose
  4. -D-glucopyranose and -D-fructopyranose
AIPMT 2012 (Prelims)

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