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Molecular Basis of Inheritance

Multiple Choice Questions

121.

Balbiani rings are the structural features of

allosomes
polytene chromosomes
autosomes
lampbrush chromosomes

122.

Jumping genes in maize were discovered by

Hugo de Vries
Barbara McClintock
T H Morgan
Mendel

123.

DNA element with ability to change position is called

cistron
transposon
intron
recon

124.

Initiation codon is

125.

DNA mutiplication is called

translation
replication
transduction
transcription

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

127.
Repressor protein is produced by

regulator gene

operator gene

structural gene

promoter gene

regulator gene

The regulator gene is responsible for the synthesis of a protein called repressor. It may be active or inactive (aporepressor). The active repressor is normally seen in inducible systems while aporepressor is seen in repressible system. The repressor has an affinity for operator gene.