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

A lot of DNA does not code for polypeptides.


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

Satellite DNA.


What does satellite DNA contain?

Simple base sequences repeated many times.


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.


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

20 thousand.