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

Balbiani rings are the structural features of

• allosomes

• polytene chromosomes

• autosomes

• lampbrush chromosomes

DNA element with ability to change position is called

• cistron

• transposon

• intron

• recon

Jumping genes in maize were discovered by

• Hugo de Vries

• Barbara McClintock

• T H Morgan

• Mendel

Initiation codon is

• UUU

• UGA

• AUG

• UAG

Repressor protein is produced by

• regulator gene

• operator gene

• structural gene

• promoter gene

Stop codons are

• AUG, GUG

• UAA, UGA, UAG

• UAC, UGG

• AGU, AGA, UAC

DNA mutiplication is called

• translation

• replication

• transduction

• transcription

Which of the following is not a Pyrimidine?

• Thymine

• Uracil

• Guanine

• Cytosine

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

• Deoxyribose

• Ribose

• Sucrose

• Maltose