2.3 - Test mistakes Flashcards
1
Q
Why are species that reproduce asexually genetically identical to their parents?
A
Asexual reproduction occurs due to mitosis
When DNA replication takes place
Sister chromatids divided equally into each cell
Therefore cells have no genetic variation
2
Q
Explain the role of DNA ligase in DNA replication?
A
Repairs breaks in phosphodiester backbone
By forming phosphodiester bonds
Between phosphate and sugar
3
Q
Why is it important to make sure an appropriate stain is used when observing cells?
A
Stain is used to see chromosomes that aren’t usually visible
Stains attach to chromosomes
4
Q
The role of the cell cycle
A
Increase cell numbers
Produce clones
5
Q
How will the cell cycle be affected if cells become cancerous?
A
Shorter G phase
Faster cycle
Cells don’t become specialised
