1
MCQ (Single Correct Answer)

AIPMT 2004

Which of the following structures represents the peptide chain?
A
B
C
D

Explanation

In peptide linkage i.e., (– CONH) group, the carboxyl group of one amino acid molecule forms an amide by combination with the amino group of the next amino acid molecule with the liberation of water molecule.
2
MCQ (Single Correct Answer)

AIPMT 2004

The helical structure of protein is stablised by
A
dipeptide bonds
B
hydrogen bonds
C
ether bonds
D
peptide bonds

Explanation

The $$\alpha $$-helix structure is formed when the chain of $$\alpha $$-amino acids coils as a right handed screw (called $$\alpha $$-helix) because of the formation of hydrogen bonds between amide groups of the same peptide chain, i.e., NH group in one unit is linked to carbonyl oxygen of the third unit by hydrogen bonding. This hydrogen bonding between different units is responsible for holding helix in a position.
3
MCQ (Single Correct Answer)

AIPMT 2004

The hormone that helps in the conversion of glucose to glycogen is
A
cortisone
B
bile acids
C
adrenaline
D
insulin

Explanation

Insulin is a hormone secreted by the pancreas that lowers blood glucose level by promoting the uptake of glucose by cells and the conversion of glucose to glycogen by the liver and skeletal muscle.
4
MCQ (Single Correct Answer)

AIPMT 2004

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.

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