RNA

Question 1

Three types of RNA?

Answer 1

1. tRNA
2. rRNA
3. mRNA

Question 2

What is mRNA?

Answer 2

single stranded seq of ribonucleotides synthesised from a DNA template

Question 3

Type of mRNA in euk and prok

Answer 3

Monocistronic

Polycistronic

Question 4

Role of mRNA

Answer 4

Carrier molecule;

Conveys DNA seq specifying aa seq of a polypeptide;

from nucleus to ribosomes

Question 5

struct of tRNA

Answer 5

Folds back upon itself;

H bonds bt complementary base pairs;

3’ end CCA; aa specific to tRNA molecule

Question 6

Role of tRNA

Answer 6

carriers aa to ribosome during protein synthesis;

anticodon complementary to codon on mRNA;

Question 7

Role of rRNA?

Answer 7

Ribosomal proteins;

Small and large subunits;

Functional ribosomes

Question 8

Type of ribosome in
Euk
Prok

Answer 8

Euk:
40S + 60S = 80S

Prok.
70s

Question 9

Small ribosomal subunit has?

Answer 9

Binding site for mRNA

Question 10

Large ribosomal subunit has which three binding sites for tRNA?

Answer 10

P
-holds tRNA carrying growing polypeptide chain;

A
-holds tRNA carrying next aa to to added to the polypeptide chain;

E
-discharged tRNA leaves ribosome