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Molecular Basis of Inheritance · Question 159

AIPMT 2001MCQEasy📈 Topic in 75% papers+4−1
1

Gene and cistron words are sometimes used synonymously because : -

  1. One gene contains one cistron
  2. One cistron contains many genes
  3. One gene contains no cistron
  4. One gene contains many cistrons

Answer

(1) One gene contains one cistron

Solution

As per NCERT, the cistron is a segment of DNA coding for a polypeptide; a gene is defined as the functional unit of inheritance.

⇒ When one gene codes for one polypeptide, the gene consists of exactly one cistron (one gene – one polypeptide).

∴ The two words are used synonymously because one gene contains one cistron.

Answer: (1)

AIPMT 2001

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2

Types of RNA polymerase required in nucleus for RNA synthesis : -

  1. 2
  2. 3
  3. 1
  4. 4
AIPMT 2001
3

A mutant strain of T4 bacteriophage, R-II, fails to lyse E. coli, but when two strains R-IIX and R-IIY are mixed, they lyse E. coli. What may be the possible reason?

  1. Both strains have different cistrons
  2. Both strains have similar cistrons
  3. It is not mutated
  4. Bacteriophage transforms into wild type
AIPMT 2001
4

Method of DNA replication in which two strands of DNA separate and synthesize new strands

  1. Conservative
  2. Non conservative
  3. Dispersive
  4. Semiconservative
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5

Which of the following is initiation codon?

  1. AUC
  2. CCU
  3. UAG
  4. AUG
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6

Anticodon occurs in:

  1. DNA
  2. r-RNA
  3. t-RNA
  4. m-RNA
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7

Length of one loop of B-DNA:

  1. 20 nm.
  2. 10 nm.
  3. 3.4 nm.
  4. 0.34 nm.
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8

In three dimensional view the molecule of t-RNA is:

  1. E-shaped
  2. L-shaped
  3. S-shaped
  4. Y-shaped
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9

Similarity in DNA and RNA:

  1. Both have similar sugar
  2. Both are genetic material
  3. Both have similar pyrimidine
  4. Both are polymer of nucleotides
AIPMT 2000
10

Which is the most important factor for continuity of a species from evolutionary point of view?

  1. Formation of gametes
  2. Synthesis of proteins
  3. Replication of genetic material
  4. None of these
AIPMT 2000

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