Cell Cycle

Question 1

What protein sticks chromatids together in G2

Answer 1

Cohesin- go round the two chromatids and stick them together

Question 2

Which protein drives condensing in early prophase

Answer 2

Condensins- phosphate groups stuck to them activate them which causes them to condense DNA

Question 3

What are lamins

Answer 3

Proteins which are phosphorylated which triggers the breakdown of the nuclear envelope during late prophase

Question 4

What does seperase do in metaphase

Answer 4

Esperase cleaves the cohesions, triggering the start of anaphase

Question 5

What happens to lamins in telophase

Answer 5

Lamins are not phosphorylated so nuclear envelope reforms

Question 6

Define a synaptonemal complex

Answer 6

Homologous chromosomes held together and in perfect alignment by a protein lattice.

Question 7

Define chiasmata

Answer 7

Cross overs between non-sister chromatids of homologous chromosomes