DNA, genes and chromosomes

Question 1

Where is a gene located?

Answer 1

A locus

Question 2

What does a gene code for?

Answer 2

The amino acid sequence of a polypeptide

or functional RNA

Question 3

Features of genetic code?

Answer 3

Universal - Each triplet codes for the same amino acid

Degenerate - Some amino acids are coded for by multiple triplets

Non overlapping - Each triplet is distinct from the other triplets

Question 4

What are the regions of non coding DNA

Answer 4

Introns - removed through splicing of the mRNA. Found with the gene between exons.

Between genes there are non coding multiple repeats

Question 5

How is DNA stored

Answer 5

Combine with histone proteins to form DNA - histone complexes

DNA histone complex coils

Coils fold and form loops

Loops coil together to form chromosomes

Question 6

What us the DNA histone complex called?

Answer 6

Chromatin

Question 7

Role of histone proteins?

Answer 7

Orchestrate the folding into coils and then looped structures

Holds DNA in position