4.4

Question 1

Role of mRNA Codons

Answer 1

Contains code for proteins

Question 2

Role of tRNA Anticodons

Answer 2

Transfer amino acids that pair with mRNA codons.

Question 3

Role of rRNA Ribosome

Answer 3

Facilitates matching of mRNA and tRNA.

Question 4

The arrival site, the ribosome matches tRNA.

Answer 4

The A site

Question 5

Peptidyl and RNA site
holds tRNA carrying the polypeptide chain.

Answer 5

The P site

Question 6

The exit site
tRNA leaves the ribosome

Answer 6

The E site

Question 7

Transcribe the templete DNA:

TAC GGG TCC ATT

Answer 7

AUG CCC AGG UAA

Question 8

Translate the mRNA:
AUG CCC AGG UAA

Answer 8

Met (Start), Pro, Arg, Stop

Question 9

What do we mean when we say the code is redundant?

Answer 9

There are several Codons for each amino acid.

Question 10

How many possible triplet codes can be generated from the four base letters?

Answer 10

64

Question 11

What is mutation?

Answer 11

change in base sequence

Question 12

Causes of mutation

Answer 12

viral infections, radiation (x-ray, UV)

Question 13

Changing one base

Answer 13

point mutation

Question 14

Deleting/ inserting so the things move around “downstream”

Answer 14

Frameshift

Question 15

What type of mutation is the following?

AUG GGA AAG UAA

AUG CGA AAG UAA

Answer 15

Point
Missense