12th Standard CBSE - Biology - Molecular Basic of Inheritance

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Question - 1

Jumping genes given by Barbara Mclintock are also called

  • A Transposons
  • B Mutons
  • C Cistrons
  • D Vectors

Question - 2

DNA polymerases are generally used in DNA replication

  • A To cut the helix at certain place
  • B For proof reading
  • C Adding carbonyl compound
  • D Breaking and joining pieces of one DNA strand

Question - 3

Nitrogenous base sequence in one strand of DNA is ATGCTTGA, the sequence in the complementary strand will be

  • A TAGGTAGT
  • B TACGAACT
  • C TACGTACT
  • D TCCGAACT

Question - 4

That the mode of DNA replication is semiconservative was demonstrated by

  • A Khorana
  • B Watson and Crick
  • C Meselson and Stahl
  • D Tayler

Question - 5

In DNA replication, leading strand replicates in

  • A 5' ------>3' direction continuously
  • B 3'------>5' direction continuously
  • C 5'----->3' directiom discontinuosly
  • D 3,------->5' direction discontinuously

Question - 6

Temin and Baltimore are associated with the discovery of

  • A RNA synthesis
  • B Transcription
  • C Reverse transcription
  • D photorespiration

Question - 7

How many codons code for amino acids?

  • A 64
  • B 61
  • C 68
  • D 60

Question - 8

How many base pairs are present in DNA cut by endonuclease

  • A 2
  • B 4
  • C 6
  • D 8

Question - 9

In DNA, guanine and cytosine are bonded with how many hydrogen bonds?

  • A 1
  • B 2
  • C 3
  • D 4

Question - 10

Hargobind Khorana got Nobel Prize for

  • A Gene synthesis
  • B Determining genetic code
  • C Producing disease resistant maize
  • D Discovery of transposons