CBSE
Multiple Choice QuestionsDuring transcription holoenzyme RNA polymerase binds to a DNA sequence and the DNA assumes a saddle like structure at that point. What is that sequence called?
CAAT box
GGTT box
AAAT box
TATA box
DNA replication generally proceeds in a
5 3 direction
3 5 direction
3 3 direction
5 5 direction
Which one of the following makes use of RNA as a template to synthesize DNA?
Reverse transcriptase
DNA dependant RNA polymerase
DNA polymerase
RNA polymerase
DNA polymerase enzyme is required for synthesis of
DNA from RNA
RNA from DNA
DNA from DNA
RNA from RNA
Sequence of DNA (non-coding) is known as
exon
intron
cistron
none of these
RNA is not found in
chromosome
plasmalemma
nucleolus
ribosome
E. coli cells with a mutated Z gene of the lac operon cannot grow in medium containing only lactose as the source of energy because
in the presence of glucose, E. coli cells do not utilize lactose
they cannot transport lactose from the medium into the cell
the lac operon is constitutevely active in these cells
they cannot synthesize functional - galactosidase
Which one of the following hydrolysis internal phosphodiester bonds in a polynucleotide chain?
Lipase
Exonuclease
Endonuclease
Protease
In split genes the coding sequences are called
introns
exons
cistrons
operons
What's the difference between RNA and DNA?
Base
Sugar
Sugar and base
Phosphate
