Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Molecular Basis of Inheritance

Multiple Choice Questions

281.

The Okazaki fragments in DNA chain growth

Results in transcription
Polymerise in the 3' to 5' direction and forms replication fork
Prove semi-conservative nature of DNA replication
Polymerise in the 5' to 3' direction and explain 3' to 5 DNA replication

282.

One gene-one enzyme relationship was established for the first time in

Neurospora crassa
Salmonella typhimurium
Escherichia coli
Diplococcus pneumoniae

283.

Balbiani rings are the structural features of

allosomes
polytene chromosomes
autosomes
lampbrush chromosomes

284.

Jumping genes in maize were discovered by

Hugo de Vries
Barbara McClintock
T H Morgan
Mendel

285.

DNA element with ability to change position is called

cistron
transposon
intron
recon

286.

Initiation codon is

287.

DNA mutiplication is called

translation
replication
transduction
transcription

288.

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

289.
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.