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    molecular basis of inheritance

    Multiple Choice QuestionsMultiple Choice Questions

    121.

    Balbiani rings are the structural features of

    • allosomes

    • polytene chromosomes

    • autosomes

    • lampbrush chromosomes

    Answer
    122.

    Jumping genes in maize were discovered by

    • Hugo de Vries

    • Barbara McClintock

    • T H Morgan

    • Mendel

    Answer
    123.

    DNA element with ability to change position is called

    • cistron

    • transposon

    • intron

    • recon

    Answer
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    124.

    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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    125.

    DNA mutiplication is called

    • translation

    • replication

    • transduction

    • transcription

    Answer
    126.

    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
    127.

    Repressor protein is produced by

    • regulator gene

    • operator gene

    • structural gene

    • promoter gene

    Answer
    128.

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

    • Deoxyribose

    • Ribose

    • Sucrose

    • Maltose

    Answer
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    129.

    Stop codons are

    • AUG, GUG

    • UAA, UGA, UAG

    • UAC, UGG

    • AGU, AGA, UAC

    Answer
    130.

    Which of the following is not a Pyrimidine?

    • Thymine

    • Uracil

    • Guanine

    • Cytosine

    Answer
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