The direction of DNA replication is from :

• amino acid end

• 3' end towards 5' end

• 5' end towards 3' end

• amino terminus to carboxy terminus

In operon concept, regulator gene functions as:

• repressor

• regulator

• inhibitor

• initiator

In the lactose operon of Escherichia coli what is the function of promoter

• Binding of Gyrase enzyme

• Binding of RNA polymerase

• Codes for RNA polymerase

• Processing of messenger RNA

Sex factor in bacteria is

• F-replicon

• chromosomal replicon

• RNA

• sex pillies

Most simple amino acid is

• lysine

• glycine

• aspartic acid 

• nucleic acid

Which of the following be named for DNA produced from RNA?

• A- DNA

• B- DNA

• C- DNA

• Z- DNA

The length of DNA having 23 base pair is

• 78 A^o 

• 78.4 A^o.

• 74.8 A^o 

• 78.2A^o

Number of nitrogenous bases in a codon is

• 3 

• 2

• 1 

• 5

339.

Chromosomes can be stained with one of the following chemicals

• acetocarmine 

• safranine

• light green

• eosin

In a DNA molecule, distance between two bases is

• 2 nm/ 20 Å

• 0.2 nm/ 2 Å

• 3.4 nm/ 34 Å

• 0.34 nm/ 3.4 Å