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Biomolecules · Question 50

AIPMT 2004MCQMedium📈 Topic in 25% papers+4−1
1

Which of the following structures represents the peptide chain?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(3) [figure]

Solution

Proteins are polymers of -amino acids, H2N-CH(R)-COOH, joined by peptide (amide) linkages -CO-NH-.

A peptide chain is the repeating unit -NH-CH(R)-CO-: every N is followed by one -carbon and then a >C=O group bonded to the next N.

Structure (3) is -NH-C-CO-NH-C-CO-NH-C-CO-, exactly this pattern.

(1) has -NH-CO-NH- (urea-type) links, (2) has only one amide link followed by a chain of carbons, and (4) has two carbons between N and C=O (not -amino acid units).

Answer: (3)

AIPMT 2004

Keep practising — Biomolecules

2

The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called

  1. maltase
  2. lipase
  3. zymase
  4. pepsin
Out of syllabusAIPMT 2004
3

Glycolysis is

  1. oxidation of glucose to glutamate
  2. conversion of pyruvate to citrate
  3. oxidation of glucose to pyruvate
  4. conversion of glucose to haem
AIPMT 2003
4

Phospholipids are esters of glycerol with

  1. three carboxylic acid residues
  2. two carboxylic acid residues and one phosphate group
  3. one carboxylic acid residue and two phosphate groups
  4. three phosphate groups
AIPMT 2003
5

Chargaff's rule states that in an organism

  1. amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
  2. amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
  3. amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
  4. amounts of all bases are equal
AIPMT 2003
6

Enzymes are made up of

  1. edible proteins
  2. proteins with specific structure
  3. nitrogen containing carbohydrates
  4. carbohydrates
AIPMT 2002
7

Which is not a true statement?

  1. -carbon of -amino acid is asymmetric
  2. All proteins are found in L-form
  3. Human body can synthesise all proteins it needs
  4. At pH = 7, both amino and carboxylic groups exist in ionised form
AIPMT 2002
8

Cellulose is polymer of

  1. glucose
  2. fructose
  3. ribose
  4. sucrose
Out of syllabusAIPMT 2002
9

Which of the following give positive Fehling solution test?

  1. Sucrose
  2. Glucose
  3. Fats
  4. Protein
AIPMT 2001
10

Which of the following is correct about H-bonding in nucleotide?

  1. A-T, G-C
  2. A-G, T-C
  3. G-T, A-C
  4. A-A, T-T
AIPMT 2001
11

Which of the following is correct?

  1. Cycloheptane is an aromatic compound.
  2. Diastase is an enzyme
  3. Acetophenone is an ether.
  4. All of these.
AIPMT 2001

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