UNIT 1: Key Area 1 b) Organisation of DNA Flashcards
1
Q
what do prokaryotes contain ?
A
- single circular chromosome
- smaller circular plasmids
- contains NO nucleas
2
Q
what do eukaryotes contain ?
A
- contains a nucleas
- several linear chromosomes
- packages with associated proteins ( histones)
- extra circular chromosomes out with nucleas (cytoplasm)
3
Q
how are eukaryotes packaged ?
A
DNA is tightly coiled
packaged with asscosiatwd proteins
(histones)
4
Q
what is special about yeast ?
A
it is a single called eukaryote
possesses circular plasmids in cytoplasm
5
Q
how is a sugar phosphate back bone created
A
chemical bond forms between a phosphate of one nucleotide and sugar of another nucleotide
creating a permanent strand
6
Q
why does the double helix strands twist?
A
to allow the bases to align with one another
7
Q
how does DNA become chromosomes
A
it’s tightly packaged with associated proteins (histones)
