1
MCQ (Single Correct Answer)

AIPMT 2010 Mains

Fructose reduces Tollen's reagent due to
A
asymmetric carbons
B
primary alcoholic group
C
secondary alcoholic group
D
enolisation of fructose followed by conversion to aldehyde by base

Explanation

Under alkaline conditions of the reagent, fructose gets converted into a mixture of glucose and mannose (Lobry de Bruyn van Ekenstein rearrangement) both of which contain the –CHO group and hence reduce Tollens’ reagent to give silver mirror test.
2
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

Which one of the following does not exhibit the phenomenon of mutaroation?
A
(+) Sucrose
B
(+) Lactose
C
(+) Maltose
D
($$-$$) Fructose

Explanation

Sucrose does not show mutarotation.

Only those sugars which have a free aldehyde or ketone group are capable of showing mutarotation.
3
MCQ (Single Correct Answer)

AIPMT 2009

Which of the following hormones contains iodine?
A
Testosterone
B
Adrenaline
C
Thyroxine
D
Insulin

Explanation

Thyroxine contains iodine
4
MCQ (Single Correct Answer)

AIPMT 2009

The segment of DNA which acts as the instrumental manual for the synthesis of the protein is
A
ribose
B
gene
C
nucleoside
D
nucleotide

Explanation

The DNA sequence that codes for a specific protein is called a Gene and thus every protein in a cell has a corrosponding gene.

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