351.

Which one of the following triplet codon is known as initiation codon?

• UUU

• UAA

• AUG

• UGA

A-DNA is

• left-handed helix with 12 nucleotide pairs per turn

• right-handed helix with 11 nucleotide pairs per turn

• right handed helix with 12 nucleotide pairs per turn

• left-handed helix with 11 nucleotide pairs per tum

What would be the percentage of thymine in a double stranded DNA sample which contains 20% cytosine of the total bases?

• 10%

• 20%

• 30%

• 40%

The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks A to C

• A - transcription, B - replication, C - James Watson

• A - translation, B - transcription, C - Erevin Chargaff

• A - transcription, B - translation, C - Francis Crick

• A - translation, B - extension, C - Rosalind Franklin

Which enzyme/s will be produced in a cell in which there is a non-sense mutation in the lac Y gene?

• $\mathrm{\beta }$- galactosidase

• Lactose permease

• Transacetylase

• Lactose permease and transacetylase

Formation of polysome does not require

• rRNA

• mRNA

• tRNA

• snRNA

Genes which are located only in the X-chromosome are known as

• epistasis genes

• holandric genes

• operator genes

• antiepistasis genes

Which codon is not an indicator of completion of protein synthesis?

• UAG

• AUG

• UAA

• UGA

If the sequence of bases in the coding strand of a double-stranded DNA is 5'-GTTCGAGTC-3', the sequence of bases in its transcript will be

• 5'-GACUCGAAC-3'

• 5'-CAAGCUCAG-3'

• 5'-GUUCGAGUC-3'

• 5'-CUGAGCUUG-3'

Nucleosome contains

• Only histone protein

• Both DNA and histone protein

• Only DNA

• Both DNA and RNA