Polymase is formed by

• several ribosomes attached to a single mRNA

• many ribosomes attached to a strand of endoplasmic reticulum

• a ribosome with several subunits

• a ribosome with several subunits

In the DNA molecule

• the  total amount of purine nucleotides and pyrimidine nucleotides is not always equal

• there are two strands, which run parallel in the 5' →3' direction

• the proportion of adenine in relation to thymine varies with organism

• the proportion of adenine in relation to thymine varies with organism

Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?

• Thymine, Uracil - Pyrimidines

• Uracil, Cytosine - Pyrimidines

• Guanine, Adenine - Purines

• Guanine, Adenine - Purines

Cry-I endotoxins obtained from Bacillus thringiensis are effective against 

• mosquitoes

• flies

• nematodes

• nematodes

What is antissense technology? 

• A cell displaying a foreign antigen used for synthesis of antigens

• Production of somaclonal variants in tissue cultures. 

• When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.

• When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.

The linking of antibiotic resistance gene with the plasmid vector became possible with

• DNA ligase

• endonucleases

• DNA polymerase

• DNA polymerase

Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they

• act as replicons.

• are RNA transcription initiator

• help chromosome pairing

• help chromosome pairing

Molecular basis of organ differentiation dpends on the modulation in transcription by

• RNA polymerase

• ribosome

• transcription factor

• transcription factor

During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure, what is it’s DNA-binding sequence?

• TTAA

• AATT

• CACC

• CACC

230.

Differentiation of organs and tissues in a developing organism, is associated with

• developmental mutations

• differential expression of genes

• lethal mutations

• lethal mutations