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Biomolecules · Question 33

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 0% papers+4−1
1

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

  1. (+) Sucrose
  2. (+) Lactose
  3. (+) Maltose
  4. (−) Fructose

Answer

(1) (+) Sucrose

Solution

Mutarotation is shown by a sugar having a free hemiacetal / hemiketal group, which can open to the chain form and close again as the other anomer.

Lactose and maltose have a free hemiacetal group in one unit, and fructose is a free monosaccharide all three show mutarotation.

As per NCERT, in sucrose the glycosidic linkage is between C1 of -D-glucose and C2 of -D-fructose, so both reducing groups are involved in the linkage sucrose is a non-reducing sugar.

(+) Sucrose has no free hemiacetal group and does not exhibit mutarotation.

Answer: (1)

AIPMT 2010 (Prelims)

Keep practising — Biomolecules

2

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
3

Which of the following hormones contains iodine?

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

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
5

Which of the following is an amine hormone?

  1. Insulin
  2. Progesterone
  3. Thyroxine
  4. Oxypurine
AIPMT 2008
6

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
7

Which of the following vitamins is water-soluble?

  1. Vitamin E
  2. Vitamin K
  3. Vitamin A
  4. Vitamin B
AIPMT 2007
8

The human body does not produce

  1. enzymes
  2. DNA
  3. vitamins
  4. hormones
AIPMT 2006
9

Which one of the following is a peptide hormone?

  1. Adrenaline
  2. Glucagon
  3. Testosterone
  4. Thyroxine
AIPMT 2006
10

During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process Proteins enzyme (A) Polypeptide enzyme (B) Amino acids are respectively

  1. invertase and zymase
  2. amylase and maltase
  3. diastase and lipase
  4. pepsin and trypsin
AIPMT 2006
11

Which functional group participates in disulphide bond formation in proteins?

  1. Thioester
  2. Thioether
  3. Thiol
  4. Thiolactone
AIPMT 2005

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