Coding and Non-coding DNA Flashcards Preview

DNA, RNA and Protein Synthesis - Biology - Alevel > Coding and Non-coding DNA > Flashcards

Flashcards in Coding and Non-coding DNA Deck (5)
1

How much of the DNA in a eukaryotic cell is coding DNA?

2%
A lot of DNA does not code for polypeptides.

2

What are non-coding regions of DNA between a gene called?

Satellite DNA.

3

What does satellite DNA contain?

Simple base sequences repeated many times.

4

Name some functions of non-coding DNA?

Structural - helping to coil DNA molecule into chromosomes.
Controls function - regulating when genes are expressed.
Involved in DNA replication.
Contains unused copies of genes.

5

What is the estimated number of genes humans have for controlling our characteristics?

20 thousand.