1) how does oxygen enter cells?

by diffusion.

2) which part of the cell uses the most oxygen?

the mitochondria.

3) why are root hair cells useful for plants?

they have a large surface area (absorb more water and minerals).

4) why must equipment be sterilised?

to prevent cross contamination.

5) why is bone marrow a tissue?

its a group of cells working together to make blood cells.

6) why are there clear areas on agar jelly?

bacteria was killed by disinfectant?

7) which disinfectant is best?

the one with the largest clear zone (kills most bacteria).

8) what is osmosis?

movement of water from high to low concentration through a semi-permeable membrane.

9) what is mitosis?

the process of cell division that produces 2 identical cells.

10) how does asexual reproduction happen?

by mitosis (no gametes ,identical offspring).

11) 3 differences between prokaryotes and eukaryotes:

Prokaryotes have no nucleus They are smaller They have no membrane-bound organelles (eukaryotes have all of these)

12) what are the 2 functions of the nucleus?

Controls cell activities Contains genetic material (DNA).

13) what is the formula for magnification?

magnification= image size divided by actual size