Molecular Basis of Inheritance

Multiple Choice Questions

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DNA element with ability to change position is called

  • cistron

  • transposon

  • intron

  • recon

B.

transposon

Transposon is a DNA segment or genetic element moving from one chromosome to another. It was introduced by R W Hedges and A E Jacob in 1974.

Cistron is the functional unit of DNA molecules as it codes for a particular gene product.

Recon is the cross- over unit or it is segment of DNA which participates in crossing over.

Introns are the interrupted genes which do not form the part of mRNA and are further removed from primary mRNA during gene expression in eukaryotes.

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    Balbiani rings are the structural features of

    • allosomes

    • polytene chromosomes

    • autosomes

    • lampbrush chromosomes

    Answer

    Repressor protein is produced by

    • regulator gene

    • operator gene

    • structural gene

    • promoter gene

    Answer

    Which of the following is not a Pyrimidine?

    • Thymine

    • Uracil

    • Guanine

    • Cytosine

    Answer

    Stop codons are

    • AUG, GUG

    • UAA, UGA, UAG

    • UAC, UGG

    • AGU, AGA, UAC

    Answer
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    DNA mutiplication is called

    • translation

    • replication

    • transduction

    • transcription

    Answer

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

    • Deoxyribose

    • Ribose

    • Sucrose

    • Maltose

    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

    Jumping genes in maize were discovered by

    • Hugo de Vries

    • Barbara McClintock

    • T H Morgan

    • Mendel

    Answer
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    Initiation codon is

    • UUU

    • UGA

    • AUG

    • UAG

    Answer
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