61.

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

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

• developmental mutations

• differential expression of genes

• lethal mutations

• lethal mutations

The Okazaki fragments in DNA chain growth

• result in transcription

• polymerize in the 3’ - to - 5’ direction and forms replication fork

• prove semi-conservative natuire of DNA replication

• prove semi-conservative natuire of DNA replication

The two polynucleotide chains in DNA are

• parallel

• discontinuous

• antiparallel

• antiparallel