8.2 DNA and chromosomes Flashcards
1
Q
How are DNA molecules in prokaryotic cells?
A
- short
- circular
- not associated with proteins
2
Q
How are DNA molecules in the nucleus of eukaryotic cells?
A
- very long
- linear
- associated with proteins
3
Q
What is the protein called that DNA is associated with?
A
Histones
4
Q
How does a chromosome form?
A
By combining DNA molecule and histones
5
Q
Which two organelles also contain DNA? How are their DNA different to DNA in nucleus?
A
Mitochondria and chloroplast. Their DNA are short, circular and not associated with protein.
6
Q
What is chromatid?
A
One of the two strands of a chromosome that are joined together by a centromere before cell division.
7
Q
What is allele?
A
One of a number of alternative forms of a gene.
