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1

AIPMT 2004

MCQ (Single Correct Answer)
The correct statement in respect of protein haemoglobin is that it
A
functions as a catalyst for biological reactions
B
maintains blood sugar level
C
acts as an oxygen carrier in the blood
D
forms antibodies and offers resistance to diseases.

Explanation

Haemoglobin acts as an oxygen carrier in the blood since it reacts with oxygen to form unstable oxyhaemoglobin which easily breaks to give back haemoglobin and oxygen.
2

AIPMT 2003

MCQ (Single Correct Answer)
Chargaff's rule states that in an organism
A
amount of adenine (A) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (C)
B
amount of adenine (A) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (C)
C
amount of adenine (A) is equal to that of cytosine (C) and the amount of thymine (T) is equal to that of guanine (G)
D
amounts of all bases are equal.

Explanation

Amount of A = T and amount of G = C, this is stated by Chargaff’s rule.
3

AIPMT 2003

MCQ (Single Correct Answer)
Phospholipids are esters of glycerol with
A
three carboxylic acid residues
B
two carboxylic acid residues and one phosphate group
C
one carboxylic acid residue and two phosphate groups
D
three phosphate groups.

Explanation

Phospholipids are derivatives of glycerol in which two of the hydroxyl groups are esterified with fatty acids while the third is esterified with some derivative of phosphoric acid with some alcohol such as choline, ethanolamine, serine or inositol.
4

AIPMT 2003

MCQ (Single Correct Answer)
Vitamin B12 contains
A
Fe (II)
B
Co (III)
C
Zn (II)
D
Ca (II)

Explanation

Vit B12 also called Cyanocobaltamin, is anti-pernicious anaemia vitamin.

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