Molecular Basis of Inheritance

Multiple Choice Questions

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Initiation codon is

  • UUU

  • UGA

  • AUG

  • UAG

C.

AUG

AUG codes for Methionine (Met) that is used as a start signal in protein syntheis. Hence, it is an initiation codon.

Also, in prokaryotes, codons GUG and UUG are the start codons.

UAA (ochre), UAG (amber) and UGA (opal) are the non- sense codons as they do not code for any amino acid. Their main function is to terminate the message for gene controlling protein synthesis. Therefore, termed as chain termination or stop codons.

UUU (uracil) codes for phenylalanine.

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    Stop codons are

    • AUG, GUG

    • UAA, UGA, UAG

    • UAC, UGG

    • AGU, AGA, UAC

    Answer

    The back bone of RNA consists of which of the following sugar?

    • Deoxyribose

    • Ribose

    • Sucrose

    • Maltose

    Answer

    DNA element with ability to change position is called

    • cistron

    • transposon

    • intron

    • recon

    Answer

    A eukaryotic gene contains two kinds of base sequences. Which of these plays an important role in protein synthesis?

    • Introns

    • Exons

    • Both (a) and (b)

    • None of these

    Answer
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    DNA mutiplication is called

    • translation

    • replication

    • transduction

    • transcription

    Answer

    Jumping genes in maize were discovered by

    • Hugo de Vries

    • Barbara McClintock

    • T H Morgan

    • Mendel

    Answer

    Which of the following is not a Pyrimidine?

    • Thymine

    • Uracil

    • Guanine

    • Cytosine

    Answer

    Repressor protein is produced by

    • regulator gene

    • operator gene

    • structural gene

    • promoter gene

    Answer
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    Balbiani rings are the structural features of

    • allosomes

    • polytene chromosomes

    • autosomes

    • lampbrush chromosomes

    Answer
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