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1

### AIPMT 2002

Which is not true statement?
A
$$\alpha$$-carbon of $$\alpha$$-amino acid is asymmetric.
B
All proteins are found in $$L$$-form
C
Human body can synthesise all proteins they need.
D
At pH = 7 both amino and carboxylic groups exist in ionised form.

## Explanation

Some proteins are also found in the D-form.
2

### AIPMT 2002

A
edible proteins
B
proteins with specific structure
C
nitrogen containing carbohydrates
D
carbohydrates.

## Explanation

Enzymes are proteins that act as catalyst for bio-chemical processes of life. They speed up these reactions enormously and with a high degree of selectivity.
3

### AIPMT 2001

Which is the correct statement?
A
Starch is a polymer of $$\alpha$$-glucose.
B
Amylose is a component of cellulose.
C
Proteins are composed of only one type of amino acid.
D
In cyclic structure of fructose, there are four carbons and one oxygen atom.

## Explanation

Starch is also know as amylum which occurs in all green plants. A molecule of starch (C6H10O5)n is built of a large number of $$\alpha$$-glucose ring joined through oxygen-atom.
4

### 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.

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