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1

AIPMT 2007

MCQ (Single Correct Answer)
RNA and DNA are chiral molecules, their chirality is due to
A
chiral bases
B
chiral phosphate ester units
C
$$D$$-sugar component
D
$$L$$-sugar component

Explanation

Each nucleic acid consists of a pentose sugar a heterocyclic base, and phosphoric acid. The sugar present in DNA is -D (–) -2-deoxy ribose and the sugar present in RNA is D (–)- ribose. The chirality of DNA and RNA molecules are due to the presence of sugar components.
2

AIPMT 2007

MCQ (Single Correct Answer)
Which of the following vitamins is water-soluble?
A
Vitamin E
B
Vitamin K
C
Vitamin A
D
Vitamin B

Explanation

Vitamin B is water soluble whereas all other are water insoluble.
3

AIPMT 2006

MCQ (Single Correct Answer)
During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process-

are respectively
A
invertase and zymase
B
amylase and maltase
C
diastage and lipase
D
pepsin and trypsin

Explanation

4

AIPMT 2006

MCQ (Single Correct Answer)
Which one of the following is a peptide hormone?
A
Adrenaline
B
Glucagon
C
Testosterone
D
Thyroxine

Explanation

Glucagon is a single chain peptide of 29 amino acids, synthesised by the $$\alpha $$-cells in the islets of Langerhans of the pancreas.

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