Exam Questions

Question 1

Describe the structure of a plasma membrane

Answer 1

-glycolipids act as cell signallers
-phospholipid hydrophobic faces inwards
-cholesterol

Question 2

Describe the effect of high temperature on the structure of cell membranes

Answer 2

-high temp = increased KE
-bilayer is distorted
-glycolipids eventually denature
-bilayer becomes more fluid

Question 3

State 2 functions of membranes within cells

Answer 3

-separate components from cytoplasm
-form vesicles

Question 4

Describe the arrangement and functions of 2 named components of a cell surface membrane

Answer 4

-phospholipids form bilayer
-increases permeability
-hydrophobic tails inwards
-provides barrier to large ions

-glycoproteins stick out and act in cell signalling

Question 5

What is meant by cell signalling?

Answer 5

-communication

Question 6

Explain how cell surface membranes contribute to the process of cell signalling

Answer 6

-release of signal molecule by exocytosis
-glycoproteins act as receptors
-complementary
-attachment = causes change

Question 7

Outline how vesicles are moved from 1 organelle to another

Answer 7

-cytoskeleton
-vesicle moves along microtubules

Question 8

State 2 examples of active transport in cells

Answer 8

-ions into root hair cell
-ions across endodermis

Question 9

Explain why plant cells don’t bust when left in pure water

Answer 9

-strong cell wall