Cell Cycle and Mitosis

Question 1

Describe binary fission in bacteria.

Answer 1

Replication of (circular) DNA;
Replication of plasmids;
cell membrane grows in the middle of cell separating cytoplasm forming identical daughter cells

Question 2

The offspring produced from farmed trout are sterile. Suggest and explain
why.

Answer 2

Too many/extra set/ of chromosomes;
(Homologous) chromosomes do not pair or separate
no meiosis

Question 3

Suggest and explain why ABZ could be used as a treatment for cancer
even though it affects some healthy cells

Answer 3

Cancer cells divide more/uncontrollably/rapidly

Question 4

Describe and explain what the student should have done when counting
cells to make sure that the mitotic index he obtained for this root tip was
accurate.

Answer 4

Examine large number of fields of view / many cells;
To ensure REPRESENTATIVE sample;

Question 5

Describe two aseptic techniques she would have used when transferring a
sample of broth culture on to an agar plate.
Explain why each was important.

Answer 5

Keep lid on Petri dish
To prevent unwanted bacteria contaminating the dish.

Use sterile pipette
To maintain a pure culture of bacteria

Question 6

what stages are in mitosis

Answer 6

PMAT and cytokinesis