1
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

Which one of the following sets of monosaccharides forms sucrose?
A
$$\alpha $$-$$D$$-galactopyranose
and $$\alpha $$-$$D$$ glucopyranose
B
$$\alpha $$-$$D$$-glucopyranose
and $$\beta $$-$$D$$ fructofuranose
C
$$\beta $$-$$D$$-glucopyranose
and $$\alpha $$-$$D$$ fructofuranose
D
$$\alpha $$-$$D$$-glucopyranose
and $$\beta $$-$$D$$ fructofuranose

Explanation

Sucrose is formed by the condensation of $$\alpha $$-D-glucopyranose and $$\beta $$-D-fructofuranose.
2
MCQ (Single Correct Answer)

AIPMT 2012 Prelims

Deficiency of vitamin B1 causes the disease
A
convulsions
B
beri-beri
C
cheilosis
D
sterility

Explanation

Deficiency of vitamin B1 causes Beri-beri.
3
MCQ (Single Correct Answer)

AIPMT 2011 Mains

Which of the statements about ''Denaturation'' given below are correct?

(1)  Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
(2)  Denaturation leads to the conversion of double strand of DND into single strand.
(3)  Denaturation affects primary structure which gets distorted.
A
(2) and (3)
B
(1) and (3)
C
(1) and (2)
D
(1), (2) and (3)

Explanation

When the proteins are subjected to the action of heat, mineral acids or alkali, the water soluble form of globular protein changes to water insoluble fibrous protein. This is called denaturation of proteins. During denaturation secondary and tertiary structures of protein destroyed but primary structures remains intact.
4
MCQ (Single Correct Answer)

AIPMT 2011 Prelims

Which one of the following statements is not true regarding (+) lactose?
A
On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
B
(+) Lactose is a $$\beta $$-glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
C
(+) Lactose is a reducing sugar and does not exihibit mutarotation.
D
(+) Lactose, C12H22O11 contains 8-OH groups

Explanation

(+) Lactose is a reducing sugar and all reducing sugar shows mutarotation.

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