Unit 4 Translation

Question 1

Structure of Ribsome

Answer 1

2 sub units

big + small

made of rRNA + ribosomal protiens

1. site A: attachment site for all new tRNA
2. site P: polypeptide site: where amino acids join the chain
3. site E: tRNA exits ribosome

Question 2

Structure of tRNA

Answer 2

4 doubl-helical segments

looks like a 4 leaf clover

3’ end = amino acid attachment site
end loop = anti codon

tRNA + animo acid = aminoacyl-tRNA

Question 3

codon vs anti codon

Answer 3

codon: 3 mRNA bases
-codes for all 20 amino acids

anti codon: on tRNA opposite of codon

Question 4

reading frame:

Wobble hypothesis:

Answer 4

reading frame: codons are read in groups of 3
-frame reading is 1 possible way to read codones
-start codons make sure the frame reading is done correctly

Wobble hypothesis: the third base doesn’t matter much in a codon

Question 5

GTP used : amino acid

Answer 5

GTP used : amino acid
3: 1