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Biomolecules · Question 45

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

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

  1. Three
  2. Four
  3. One
  4. Two

Answer

(1) Three

Solution

The genetic code is a triplet code: a sequence of three consecutive nucleotides (bases) in mRNA forms one codon, which specifies one amino acid during protein synthesis.

∴ 3 nucleotides make a codon.

Answer: (1)

AIPMT 2004

Keep practising — Biomolecules

2

The hormone that helps in the conversion of glucose to glycogen is

  1. cortisone
  2. bile acids
  3. adrenaline
  4. insulin
AIPMT 2004
3

The correct statement in respect of protein haemoglobin is that it

  1. functions as a catalyst for biological reactions
  2. maintains blood sugar level
  3. acts as an oxygen carrier in the blood
  4. forms antibodies and offers resistance to diseases.
AIPMT 2004
4

Number of chiral carbons in -D-(+)-glucose is

  1. five
  2. six
  3. three
  4. four
AIPMT 2004
5

The helical structure of protein is stabilised by

  1. dipeptide bonds
  2. hydrogen bonds
  3. ether bonds
  4. peptide bonds
AIPMT 2004
6

Which of the following structures represents the peptide chain?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004
7

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

  1. maltase
  2. lipase
  3. zymase
  4. pepsin
Out of syllabusAIPMT 2004
8

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
9

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
10

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
11

Enzymes are made up of

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

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