DNA replication

Question 1

What is DNA a polymer of?

Answer 1

Nucleotides

Question 2

Does circular DNA carry more or less genes?

Answer 2

Less

Question 3

In terms of DNA in the nucleus, what doesn’t it code for?

Answer 3

Amino acids

Question 4

What is a gene?

Answer 4

A base sequence (length) of DNA that codes for the amino acid sequence of a polypeptide chain

Question 5

How could a change in a base sequence effect an enzyme?

Answer 5

• could alter triplet
• Meaning amino acid sequence would be changed (polypeptide chain)
• Would effect the primary structure
• Cause change in tertiary structure and shape of active site of enzyme
• Enzyme-substrate complex unable to be formed
• Enzyme is non functional

Question 6

Why does a mutation not always effect proteins?

Answer 6

degenerate nature of genetic code, most a/a coded for by more than one triplet

Question 7

What is the role of histones?

Answer 7

Fix the DNA into position

Question 8

What bond holds together amino acids?

Answer 8

Polypeptide bonds

Question 9

What bonds does DNA helicase break?

Answer 9

H bonds

Question 10

What are H bonds reformed by in transcription?

Answer 10

RNA polymerase

Question 11

What is an allele/where does it occur?

Answer 11

An alternative form of a gene that that occurs at the same locus on homologous chromosomes