Coding and Non-coding DNA Flashcards
1
Q
How much of the DNA in a eukaryotic cell is coding DNA?
A
2%
A lot of DNA does not code for polypeptides.
2
Q
What are non-coding regions of DNA between a gene called?
A
Satellite DNA.
3
Q
What does satellite DNA contain?
A
Simple base sequences repeated many times.
4
Q
Name some functions of non-coding DNA?
A
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
Q
What is the estimated number of genes humans have for controlling our characteristics?
A
20 thousand.
