Cell membranes (Parts Of The Specification Missed)

Question 1

1. How does the cell membrane appear under the electron microscope?

Answer 1

as a double line.

Question 2

What happen to the extracellular sides of the protein?

Answer 2

The extracellular sides of the proteins are glycosylated to form a glycocalyx.

Question 3

draw a simple diagram to illustrate the fluid mosaic model including the labels: phospholipid bilayer, proteins, hydrophilic pores/channels (in some proteins), glycoproteins

Answer 3

Look in textbook

Question 4

How does water move through the plasma membrane?

Answer 4

Movement of water through the plasma membrane via aquaporins, protein channels specialised for water transport.

Question 5

What is cotransport?

Answer 5

Cotransport is a type of facilitated diffusion in which two substances are simultaneously transported across a membrane by one protein, or protein complex which does not have ATPase activity

Question 6

What is phagocytosis?

Answer 6

Phagocytosis is where a large particle may enter the cell, become enclosed by a membrane to form a vesicle and be transported through the cytoplasm

Question 7

Draw a diagram to illustrate phagocytosis

Answer 7

Look in textbook