PCC 1_ DNA and Genetics

Question 1

What are PURINES?

Answer 1

Guanine
Adenine

Question 2

What are PYRIMIDINES?

Answer 2

Cytosine
Thymine

Question 3

If 18% of the bases found in the DNA of an organism are made up of adenine, what percentage of cytosine will be found in that DNA?

Answer 3

32

Question 4

What is the role of Helicase in DNA replication?

Answer 4

It separates double-stranded DNA into single strands

Question 5

Replication of DNA takes place during which phase of the cell cycle?

Answer 5

S

Question 6

Why telomeres are importnat?

Answer 6

They are linked with cancer protection ageing

Question 7

In the translation process, an amino acid is carried to the growing polypeptide chain by doing what?

Answer 7

Transferring RNA

Question 8

What statement is correct for the transcription of DNA?

Answer 8

A - DNA is transcribed in the nucleus of a cell
C - Nucleotides are added to the mRNA strand during the elongation process of DNA transcription
D - RNA polymerase builds the mRNA molecule from 3’ to 5’ direction

Question 9

Mismatch repair mechanism is responsible for?

Answer 9

Repair of deletion mutations in a DNA sequence

Question 10

In the replication process what is essential;?

Answer 10

A - DNA polymerase
B - Free DNA nucleotides
C - DNA primase

Question 11

How does the process of mRNA translation differ between prokaryotic and eukaryotic cells?

Answer 11

Eukaryotic mRNA has a 5’cap and poly-A tail for protection