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Molecular Basis of Inheritance · Question 162

AIPMT 2000MCQEasy📈 Topic in 38% papers+4−1
1

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

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

Answer

(4) Semiconservative

Solution

As per NCERT (Watson and Crick), the two strands of DNA separate and each acts as a template for the synthesis of a new complementary strand.

∴ Each daughter DNA has one parental (old) strand and one newly synthesised strand ⇒ semiconservative replication (proved by Meselson and Stahl, 1958).

Answer: (4)

AIPMT 2000

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2

Which of the following is initiation codon?

  1. AUC
  2. CCU
  3. UAG
  4. AUG
AIPMT 2000
3

Anticodon occurs in:

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

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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5

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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6

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
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7

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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