1
MCQ (Single Correct Answer)

AIPMT 2004

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?
A
Three
B
Four
C
One
D
Two

Explanation

There are four bases in mRNA, i.e., adenine, cytosine, guanine and uracil. They form triplets and each triplet behave as a code for the synthesis of a particular amino acid.
2
MCQ (Single Correct Answer)

AIPMT 2003

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
MCQ (Single Correct Answer)

AIPMT 2003

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
MCQ (Single Correct Answer)

AIPMT 2003

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.

EXAM MAP

Joint Entrance Examination

JEE Advanced JEE Main

Graduate Aptitude Test in Engineering

GATE CE GATE ECE GATE ME GATE IN GATE EE GATE CSE GATE PI

Medical

NEET

CBSE

Class 12