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Biomolecules · Question 38

AIPMT 2007MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(3) D-sugar component

Solution

A nucleotide contains a nitrogenous base, a pentose sugar and a phosphate group.

∵ The bases and the phosphate units have no chiral carbon atom.

As per NCERT, the sugar in DNA is β-D-2-deoxyribose and in RNA is β-D-ribose; these sugars contain chiral carbon atoms.

∴ The chirality of DNA and RNA is due to the D-sugar component.

Answer: (3)

AIPMT 2007

Keep practising — Biomolecules

2

Which of the following vitamins is water-soluble?

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

The human body does not produce

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

Which one of the following is a peptide hormone?

  1. Adrenaline
  2. Glucagon
  3. Testosterone
  4. Thyroxine
AIPMT 2006
5

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
6

Which functional group participates in disulphide bond formation in proteins?

  1. Thioester
  2. Thioether
  3. Thiol
  4. Thiolactone
AIPMT 2005
7

The cell membranes are mainly composed of

  1. fats
  2. proteins
  3. phospholipids
  4. carbohydrates
AIPMT 2005
8

A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid?

  1. Three
  2. Four
  3. One
  4. Two
AIPMT 2004
9

The hormone that helps in the conversion of glucose to glycogen is

  1. cortisone
  2. bile acids
  3. adrenaline
  4. insulin
AIPMT 2004
10

The correct statement in respect of protein haemoglobin is that it

  1. functions as a catalyst for biological reactions
  2. maintains blood sugar level
  3. acts as an oxygen carrier in the blood
  4. forms antibodies and offers resistance to diseases.
AIPMT 2004
11

Number of chiral carbons in -D-(+)-glucose is

  1. five
  2. six
  3. three
  4. four
AIPMT 2004

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