2.3.1 - Transcription

Question 1

Where Does Transcription Take Place?

Answer 1

Nucleus.

Question 2

What Does Transcription Produce?

Answer 2

mRNA.

Question 3

Describe The Process Of Transcription
(6 Points)

Answer 3

~ A segment of DNA unwinds, breaking hydrogen bonds between complementary base pairs, exposing the gene to be transcribed.

~ RNA polymerase catalyses the formation of a complementary mRNA strand from the exposed DNA gene.

~ Free activated RNA nucleotides pair with complementary bases on the exposed DNA strand via hydrogen bonds.

~ RNA polymerase bonds the sugar-phosphate groups of the RNA nucleotides, forming the mRNA’s sugar-phosphate backbone.

~ Once the mRNA strand is complete, it detaches from the DNA, which reforms its double-stranded structure.

~ The mRNA molecule exits the nucleus through a pore in the nuclear envelope.

Question 4

What Is The Antisense / Template Strand?

Answer 4

Strand of DNA molecule used to produce the mRNA molecule.

Question 5

What Is The Sense / Coding Strand?

Answer 5

Other strand of DNA molecule.

Question 6

Which Direction Does RNA Polymerase Move Along The Antisense Strand?

Answer 6

3’ to 5’ direction.

Question 7

Which Direction Does The mRNA Molecule Grow In?

Answer 7

5’ to 3’ direction.