exam qs lqc 3

Question 1

Explain how goblet cells release mucus by exocytosis.

Answer 1

mucus contained in membrane bound vesicles inside the cell, these vesicles fuse with the cell membrane releasing the mucus

Question 2

Describe the function of carrier proteins in a cell surface membrane.

Answer 2

involved in facilitated diffusion, movement of large molecules from a high concentration to a low concentration, involved in active transport, needs ATP to move molecules against concentration gradient

Question 3

Describe how glucose enters muscle cells through the cell membrane.

Answer 3

carrier proteins located in the membrane, glucose enters by facilitated diffusion

Question 4

Explain how the partial permeability of the surface membrane of the cells lining the bronchi allows osmosis to take place.

Answer 4

partially permeable membrane is a barrier to some solutes but not water, enables a concentration of solutes