Cell Biology Nat 5 exam study questions

What name is given to the basic units of life that can lead an independent existence?

Name FOUR structural features that a typical plant and animal cells have in common.

Identify THREE structural features present in an Elodea leaf cell but absent from a cheek epithelial cell.

Match the functions of the following structures:

• Cell membrane

• Control of movement of substances into and out of the cell

• Chloroplast

• Aerobic respiration

• Mitochondria

• Photosynthesis

• Nucleus

• Control of cell activities

Express 1 millimetre in micrometres

Mathematical Equivalence

ON

Express 1 micrometre as a decimal fraction of a millimetre.

1 micrometre = how many millimetres?

Mathematical Equivalence

ON

Name TWO types of molecules present in the cell membrane

Which of the molecules from the previous question would become denatured at 70*C?

Define the terms diffusion and concentration gradient.

Answer explanation

Diffusion is the movement of molecules of a substance from a high concentration to a low concentration until the concentration becomes equal throughout.

The concentration gradient is the difference between a region of high concentration and a region of low concentration.

Name TWO essential substances that enter an animal cell by diffusion