Translation/RNA Flashcards Preview

OCR A level biology > Translation/RNA > Flashcards

Flashcards in Translation/RNA Deck (15)
Loading flashcards...
1
Q

What are the 3 types of RNA?

A

rRNA, tRNA, mRNA

2
Q

What is the function of rRNA?

A

It is a component of ribosomes which are the site of protein synthesis

3
Q

What is the function of tRNA?

A

Transports an amino acid specific to its anticodon to the correct position along mRNA during translation

4
Q

What is the function of mRNA?

A

A sequence of bases which are complementary to a gene and so confer the gene so the protein it codes for can be made

5
Q

How many different anticodons are there?

A

64

6
Q

How many bases make up an anticodon region?

A

3

7
Q

What is the anticodon region?

A

3 bases complementary to a codon

8
Q

What are the 2 most important features of a tRNA molecule?

A
  • the anticodon region

- the region which attaches to a specific amino acid

9
Q

What is translation?

A

-the process by which the complementary code carried by mRNA is decoded by tRNA into a sequence of amino acids

10
Q

Where does translation occur?

A

At the ribosome

11
Q

What are the 3 steps in translation?

A
  • initiation
  • elongation
  • termination
12
Q

What occurs in initiation?

A

An initiation complex is formed, mRNA attaches to subunits of a ribosome. The mRNA attracts a tRNA with an anitcodon that is complementary to the codon on mRNA

13
Q

What occurs in elongation?

A
  • the second tRNa is attracted by codon-anticodon complementarity. A condensation reaction occurs between two amino acids with a peptide bond forming between them
  • the ribosome shift one codon along the mRNA and the first tRNA is released
  • the next tRNA attached to the mRNA due to base complementarity
  • this is repeated
14
Q

What occurs in termination?

A
  • when a stop codon is reached a polypeptide is released

- the protein will fold and the mRNA is released from the ribosome

15
Q

What happens to the tRNA when it is released from the mRNA?

A

It is activated in the cytoplasm to pick up another amino acid