Molecular Basis of Inheritance

Multiple Choice Questions

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In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?

  • 61

  • 60

  • 20

  • 64

A.

61

Out of 64 codons, three (UM, UAG, UGA) are chain terminating codons. The translating mechanism is not able to read these codons.
(a) 61 codons are used to code all the 20 essential amino acids.

(b) Out of 64, 3 codons, UAA, UAG, UGA do not code any amino acid molecule

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    Ribosomal RNA (rRNA) is synthesized in

    • nucleolus

    • nucleosome

    • cytoplasm

    • ribosome

    Answer

    DNA is specific because it has

    • number of nucleotides

    • specific nature of phosphate and sugar

    • arrangement of protein in DNA

    • specific nature of purine and pyrimidines

    Answer

    The RNA found in eukaryotic ribosomes are

    • 5 S and 16 S RNA

    • 5 S, 16 S, 18 S RNA

    • 23S, 16 S, RNA

    • 5 S and 28 S RNA

    Answer

    The number of RNA molecules in 60S sub- particles of 80S ribosomes are

    • five 

    • four

    • three

    • two

    Answer
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    During translation initiation in prokaryotes, a GTP molecule is needed in

    • association of 30S, mRNA with formyl-met-tRNA

    • association of 50S subunit of ribosome with initiation complex

    • formation of formyl-met-tRNA

    • binding of 30S subunit of ribosome with mRNA

    Answer

    Stop codons are

    • AUG, GUG

    • UAA, UGA, UAG

    • UAC, UGG

    • AGU, AGA, UAC

    Answer

    DNA multiplication is called

    • translation

    • replication

    • transduction

    • transcription

    Answer

    Role of carbohydrate in protoplasm

    • as catalyst

    • for energy

    • as enzymes

    • for synthesis

    Answer
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    Which one of the following codons codes for the some information as UGC?

    • UGU

    • UGA

    • UAG

    • UGG

    Answer
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