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Biomolecules · Question 30

AIPMT 2011 (Mains)MCQEasy📈 Topic in 25% papers+4−1
1

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

  1. B and C
  2. A and C
  3. A and B
  4. A, B and C

Answer

(3) A and B

Solution

A: As per NCERT, during denaturation the secondary and tertiary structures of a protein are destroyed – correct.

B: On heating, the hydrogen bonds between the two strands of DNA break and the double helix separates into single strands; this is called denaturation of DNA – correct.

C: As per NCERT, the primary structure remains intact during denaturation – incorrect.

∴ A and B are correct.

Answer: (3)

AIPMT 2011 (Mains)

Keep practising — Biomolecules

2

Which one of the following statements is not true regarding (+) lactose?

  1. On hydrolysis (+) lactose gives equal amount of D(+) glucose and D(+) galactose.
  2. (+) Lactose is a -glucoside formed by the union of a molecule of D(+) glucose and a molecule of D(+) galactose.
  3. (+) Lactose is a reducing sugar and does not exhibit mutarotation.
  4. (+) Lactose, C12H22O11 contains 8 –OH groups
AIPMT 2011 (Prelims)
3

Fructose reduces Tollens' reagent due to

  1. asymmetric carbons
  2. primary alcoholic group
  3. secondary alcoholic group
  4. enolisation of fructose followed by conversion to aldehyde by base
AIPMT 2010 (Mains)
4

Which one of the following does not exhibit the phenomenon of mutarotation?

  1. (+) Sucrose
  2. (+) Lactose
  3. (+) Maltose
  4. (−) Fructose
AIPMT 2010 (Prelims)
5

The segment of DNA which acts as the instructional manual for the synthesis of the protein is

  1. ribose
  2. gene
  3. nucleoside
  4. nucleotide
AIPMT 2009
6

Which of the following hormones contains iodine?

  1. Testosterone
  2. Adrenaline
  3. Thyroxine
  4. Insulin
AIPMT 2009
7

In DNA, the complementary bases are

  1. adenine and guanine; thymine and cytosine
  2. uracil and adenine; cytosine and guanine
  3. adenine and thymine; guanine and cytosine
  4. adenine and thymine; guanine and uracil.
AIPMT 2008
8

Which of the following is an amine hormone?

  1. Insulin
  2. Progesterone
  3. Thyroxine
  4. Oxypurine
AIPMT 2008
9

RNA and DNA are chiral molecules, their chirality is due to

  1. chiral bases
  2. chiral phosphate ester units
  3. D-sugar component
  4. L-sugar component
AIPMT 2007
10

Which of the following vitamins is water-soluble?

  1. Vitamin E
  2. Vitamin K
  3. Vitamin A
  4. Vitamin B
AIPMT 2007
11

The human body does not produce

  1. enzymes
  2. DNA
  3. vitamins
  4. hormones
AIPMT 2006

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