1
MCQ (Single Correct Answer)

AIPMT 2001

Which of the following is correct about H-bonding in nucleotide?
A
A $$-$$ T, G $$-$$ C
B
A $$-$$ G, T $$-$$ C
C
G $$-$$ T, A $$-$$ C
D
A $$-$$ A, T $$-$$ T

Explanation

Guanine G is linked to cytosine C by three hydrogen bonds and adenine A is linked with thymine T by two hydrogen bonds. It is abbreviate as : G ≡ C and A = T
2
MCQ (Single Correct Answer)

AIPMT 2000

Which one is responsible for production of energy in bio-reaction?
A
Thyroxine
B
Adrenaline
C
Oestrogen
D
Progesterone

Explanation

It is a hormone secreted from thyroid gland. It controls various biochemical reactions involving burning of proteins, carbohydrates, fats to release energy.
3
MCQ (Single Correct Answer)

AIPMT 2000

Mg is present in
A
chlorophyll
B
haemoglobin
C
vitamin-D
D
vitamin-B

Explanation

Chlorophyll is an organometallic complex with Mg as central metal. It’s formula is C55H72MgN2O6.
4
MCQ (Single Correct Answer)

AIPMT 2000

$$\alpha $$ -$$D$$-glucose and $$\beta $$-$$D$$-glucose are
A
epimers
B
anomers
C
enantiomers
D
diastereomers

Explanation



Here 1st carbon atom becomes asymmetric giving two isomers which differ in the configuration of the asymmetric carbon. These two isomers are called as anomers.

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