8.4 Transcription And Splicing

Question 1

Transcription definition

Answer 1

Process of make pre- mRNA using part of the DNA as a template

Question 2

Splicing definition

Answer 2

Process of making mRNA from pre-mRNA by removing its introns

Question 3

Transcription process

Answer 3

• chains part
• breaking of hydrogen bonds
• by DNA Helicase
• RNA bases line up with complementary bases on template strand
• phosphodiester bonds form between mononucleotides by condensation reactions
• by RNA polymerase
• pre- mRNA spliced to remove introns

Question 4

Where does transcription and splicing occur?

Answer 4

Nucleus

Question 5

How does RNA polymerase know when to stop?

Answer 5

When the RNA polymerase reaches a the ‘stop’ triplet code

Question 6

What is the product of transcription in prokaryotic cells?

Answer 6

DNA -> mRNA

Question 7

What is the product formed by transcription in eukaryotic cells?

Answer 7

DNA -> pre- mRNA

Question 8

Why is splicing unnecessary in prokaryotes?

Answer 8

No introns

Question 9

Why are introns removed?

Answer 9

Prevent the synthesis of a polypeptide as they don’t code for anything

Question 10

How does mRNA leave the nucleus?

Answer 10

Through nuclear pores

Question 11

Why don’t mRNA just diffuse out of cells?

Answer 11

Too large

Question 12

what is the product of transcription in prokaryotes?

Answer 12

mRNA

Question 13

what is the product of transcription in eukaryotes?

Answer 13

pre- mRNA

Question 14

what do eukaryotes have that prokaryotes don’t?

Answer 14

introns