transcription

Question 1

define transcription

Answer 1

the process of which a copy of DNA is made in the nucleus to be transported to ribosomes for proteins synthesis

Question 2

describe the properties of mRNA

Answer 2

• no H bonds
• 1 strand
• single helix
• ribose

Question 3

what is the sense strand?

Answer 3

strand which contains exact code needed for protein synthesis (5’-3’)

Question 4

what is the antisense strand

Answer 4

complementary copy of the sense strand that acts as a template (3’-5’)

Question 5

summarise the process of transcription

Answer 5

• DNA helicase unwinds double strands and hydrolyses H bonds to form a sense and antisense strand
• free RNA nucleotides pair with antisense strand using complementary base pairing, forms H bonds
• RNA nucleotides join via phosphodiester bonds
• the new strand is mRNA & leaves nucleus through a pore after detaching from antisense strand