Week 3 - Proteins

Question 1

Functions of proteins

Answer 1

1. Structural - provides structural framework of various body parts
2. Regulatory- acts as hormone receptors, messengers and gene regulators
3. Contractile- allow for shortening of muscles to produce motion
4. Immunological - antibodies aid responses that protect against foreign and invading substances
5. Catalytic - acts as enzymes to regulate biochemical responses.
6. Transport

Question 2

Simple diffusion

Answer 2

Movement of small hydrophobic molecules from high concentration to low concentration across the phospholipid bilayer.

Question 3

Osmosis

Answer 3

Movement of water molecules across a semipermeable membrane from high solvent to low solvent.

Question 4

Phagocytosis

Answer 4

Referred to as cellular eating. The cells take in large pieces of solid material and the cell membrane pinches off to form a vesicles that travels in the cytoplasm. It is used to digest bacteria and dead cells.

Question 5

Pinocytosis

Answer 5

Known as cellular drinking. Cells take in smaller material. A vesicle forms around extra cellular fluid and dissolves solutes.