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What are the four differences between prokaryotic and eukaryotic DNA?
Prokaryotic DNA is shorter than Eukaryotic DNA
Prokaryotic DNA is circular whereas Eukaryotic DNA is linear
Prokaryotic DNA does not wrap around histones so do not form chromosomes unlike Eukaryotic DNA
Prokaryotic DNA does not contain introns whereas Eukaryotic does
When are chromosomes visible?
During cell division
What is the point at which sister chromatids are joined called?
Centromere
A single thread of DNA is called what?
A Chromatid
What is a homologous pair?
Two chromosomes that carry the same genes but not necessarily the same alleles
What is an allele?
A version of a gene
What is a mutation?
A permanent change to the base sequence of DNA
How can a mutation result in an enzyme not working?
The mutation results in a different base sequence.
This may lead to a change in the order of amino acids.
This leads to a change in the primary structure of the protein.
This leads to different bonds in the tertiary structure.
Which means that the active site of the enzyme changes shape and is no longer complementary to the substrate.
Note 
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