M2 - Transcription

Question 1

Transcription steps

Answer 1

1. DNA helicase breaks hydrogen bonds between bases
2. One strand acts as template and free mRNA molecules align opposite exposed bases
3. RNA polymerase joins together adjacent RNA nucleotides and forms phosphodiester bonds
4. Once on gene in copied, mRNA is modified and leaves nucleus from pores in the nuclear envelope

Question 2

Transcription step 1

Answer 2

DNA helicase breaks down hydrogen bonds between bases and the strands unwind

Question 3

Step 2

Answer 3

One strand acts as template and free mRNA molecules align opposite exposed bases

Question 4

Step 3

Answer 4

RNA polymerase joins together adjacent RNA nucleotides and forms phosphodiester bonds

Question 5

Step 4

Answer 5

Once one gene is copied, mRNA is modified and leaves nucleus through pores in the nuclear envelope