2Dp1-Transcription

Question 1

KEY TERM - Gene expression

Answer 1

the process of reading the information stored within a gene to create a functional product (Normally a protein)

Question 2

KEY TERM - Transcription

Answer 2

Where a sequence of DNA is used a template for polymerase to create a complementary sequence of mRNA.

Question 3

KEY TERM - what is pre-mRNA?

Answer 3

the immediate product of transcription-requieres modifications before it undergoes translation.

Question 4

KEY TERM - mRNA

Answer 4

RNA molecules that are produced during transcription and carry genetic information from the nucleus to the ribosomes.

Question 5

Transcription has -

Answer 5

3 phases

Question 5

stage one -

Answer 5

Initiation - Unwinding or unzipping (figurative) of the the DNA in the location of the gene being transcribed. Then RNA Polymerase begins catalysing the process.

Question 6

Stage two

Answer 6

Elongation - The process where pre-mRNA strand is being created as the RNA polymerase moves along the gene site.

Question 7

Stage three -

Answer 7

Termination - The end of the transcription where the new mRNA molecule is detached and the DNA ‘zips’ back up again.

Question 8

What is RNA Polymerase?

Answer 8

An enzyme that catalyzes or speeds up the reaction that leads to the creation of mRNA

Question 9

What is RNA processing?

Answer 9

The introns are cut out-leaving the enzyme only with Exons. Then they add a 5’ Methyl-G cap, and a 3’ Poly-A tail. They are added to protect the pranscript and help export it from the nucleus to the ribosome.

Question 10

Where does transcription occur?

Answer 10

Inside the nucleus