This document contains a 10 question multiple choice test about cell membranes and transport. The questions cover topics like: - Which parts of the cell membrane are hydrophobic - Where cholesterol is located in the membrane - Which components allow ion movement - Which molecules have specific functions like transporting ions or stabilizing layers - Types of transport like diffusion, facilitated diffusion, active transport, and osmosis - Processes that require ATP energy like endocytosis and exocytosis - The sequence of events in protein secretion by exocytosis - Examples of exocytosis and endocytosis - Determining water potential differences based on cell appearance after placement in solutions

1. 11
4 Cell membranes and transport
Click on the correct answer to each question.
1 The diagram shows a small part of a cell surface membrane.
1
2
3
4
Which regions are hydrophobic?
A 1 and 2 only
B 1 and 4 only
C 2 and 3 only
D 3 and 4 only
2 The diagram shows part of a cell surface membrane. In addition to the
molecules shown, cholesterol is also present.
D
C
B
A
In which region is cholesterol found?
Multiple-choice test
© Cambridge University Press 2013 Multiple-choice test: Chapter 4

2. 22
3 Which component of a cell surface membrane allows the movement of
ions across the membrane?
A cholesterol
B fatty acids
C phospholipid
D protein
4 The molecules which make up biological membranes have different
functions.
Which row matches molecules with their functions?
Separating
dissolved ions
Transporting
ions
Stabilising the
hydrophobic layer
Recognising self
and non-self
A cholesterol glycoprotein phospholipid protein
B glycolipid phospholipid protein cholesterol
C phospholipid protein cholesterol glycoprotein
D protein cholesterol glycoprotein phospholipid
5 A substance moves into a cell through a protein pore.
Which of the following describes this movement?
A an ion moving against its concentration gradient by active
transport
B glucose moving down its concentration gradient by diffusion
C oxygen moving against its concentration gradient by facilitated
diffusion
D carbon dioxide moving against its concentration gradient by
osmosis
Multiple-choice test: Chapter 4 © Cambridge University Press 2013

3. 33
6 Which of the following correctly describes the movement of water by
osmosis?
A from a region of higher water potential to a region of lower
water potential through a fully permeable membrane
B from a region of higher water potential to a region of lower
water potential through a partially permeable membrane
C from a region of lower water potential to a region of higher
water potential through a fully permeable membrane
D from a region of lower water potential to a region of higher
water potential through a partially permeable membrane
7 Which of the processes that transport materials across a cell surface
membrane require energy from the cell’s supply of ATP?
Key:  = requires energy from ATP  = does not require energy from ATP
Endocytosis Exocytosis Facilitated diffusion Osmosis
A    
B    
C    
D    
8 A protein is synthesised by a ribosome in an animal cell.
What is the sequence of events leading to the secretion of the protein
by exocytosis?
1 protein modified by the Golgi apparatus
2 protein enters the endoplasmic reticulum
3 secretory vesicles fuse with the cell surface membrane
4 secretory vesicles formed by the Golgi apparatus
5 vesicles bud off from the endoplasmic reticulum
A 1 → 2 → 5 → 4 → 3
B 2 → 5 → 1 → 4 → 3
C 3 → 4 → 1 → 5 → 2
D 5 → 4 → 3 → 2 → 1
© Cambridge University Press 2013 Multiple-choice test: Chapter 4

4. 44
9 Examples of the bulk transport of materials into or out of cells are listed.
1 white blood cell engulfing a bacterium
2 plant cell building up its cell wall
3 pancreas cell releasing digestive enzymes
4 ovum taking up liquid nutrients from a follicle cell
Which are examples of exocytosis?
A 1 and 2 only
B 1 and 4 only
C 2 and 3 only
D 3 and 4 only
10 A small piece of plant tissue was placed into each of three solutions,
P, Q and R. After one hour, the tissues were examined using a light
microscope and the appearance of the cells was recorded.
P Q R
What conclusion can be made about the water potentials of the three
solutions?
A The water potential of P is greater than that of R.
B The water potential of Q is greater than that of R.
C The water potential of R is greater than that of P.
D The water potential of Q is greater than that of P.
Multiple-choice test: Chapter 4 © Cambridge University Press 2013