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

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

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

• DNA ligase

• endonucleases

• DNA polymerase

• DNA polymerase

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

• developmental mutations

• differential expression of genes

• lethal mutations

• lethal mutations

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

• RNA polymerase

• ribosome

• transcription factor

• transcription factor