1
MCQ (Single Correct Answer)

AIPMT 2001


Which statement is incorrect about peptide bond?
A
C $$-$$ N bond length in proteins is longer than usual bond length of N $$-$$ C bond.
B
Spectroscopic analysis shows planar structure of group.
C
C $$-$$ N bond length in proteins is smaller than usual bond length of C $$-$$ N bond.
D
None of the above.

Explanation

Due to resonance C — N bond in protein acquires double bond character and is smaller than usual C — N bond.
2
MCQ (Single Correct Answer)

AIPMT 2001

Which of the following is correct?
A
Cycloheptane is an aromatic compound.
B
Diastase is an enzyme
C
Acetophenone is an ether.
D
All of these.

Explanation

Diastase is an enzyme. (The protein produced by living systems which acts as a biological catalyst). Enzymes are characterised by the name ending with -ase.
3
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
4
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.

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