Gene Expression (b)

Question 1

describe the role of RNA polymerase in
transcription of DNA into primary mRNA
transcripts.

Answer 1

RNA polymerase moves along DNA
unwinding the double helix and breaking
the hydrogen bonds between the bases.
RNA polymerase synthesises a primary
transcript of mRNA from RNA nucleotides
by complementary base pairing.

Question 2

What does RNA splicing form?

Answer 2

The mature mRNA transcript.

Question 3

Describe an Intron

Answer 3

The introns of the primary transcript are
non-coding regions and are removed.

Question 4

Describe an exon

Answer 4

The exons are coding regions and are joined together to form the mature transcript. The order of exons is unchanged during splicing.