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Biomolecules · Question 20

NEET 2016 (Phase 1)MCQEasy📈 Topic in 25% papers+4−1
1

In a protein molecule various amino acids are linked together by

  1. peptide bond
  2. dative bond
  3. -glycosidic bond
  4. -glycosidic bond.

Answer

(1) peptide bond

Solution

As per NCERT, proteins are polymers of α-amino acids.

The –COOH group of one amino acid condenses with the –NH2 group of the next with loss of water:

-COOH + H2N- -CO-NH- + H2O

The -CO-NH- linkage so formed is the peptide bond.

Glycosidic bonds join monosaccharide units (carbohydrates), not amino acids.

Answer: (1)

NEET 2016 (Phase 1)

Keep practising — Biomolecules

2

Which one given below is a non-reducing sugar?

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

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)
4

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)
5

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
6

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
7

In DNA, the linkages between different nitrogenous bases are

  1. phosphate linkage
  2. H-bonding
  3. glycosidic linkage
  4. peptide linkage
NEET 2013 (Karnataka)
8

Deficiency of vitamin B1 causes the disease

  1. convulsions
  2. beri-beri
  3. cheilosis
  4. sterility
AIPMT 2012 (Prelims)
9

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)
10

Which of the following is not a fat soluble vitamin?

  1. Vitamin B complex
  2. Vitamin D
  3. Vitamin E
  4. Vitamin A
AIPMT 2011 (Mains)
11

Which of the statements about "Denaturation" given below are correct?

  1. B and C
  2. A and C
  3. A and B
  4. A, B and C
AIPMT 2011 (Mains)

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