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Worksheet 3: Movement and Biological Molecules
1. A piece of onion epidermis was placed in a sugar solution on a microscope
slide. All the onion cells became plasmolysed.
Which statement is correct?
A. The sugar solution diffused into the onion cells.
B. The sugar solution diffused out of the onion cells.
C. The water potential of the contents of the onion cells was higher than the
water potential of the sugar solution.
D. The water potential of the contents of the onion cells was lower than the
water potential of the sugar solution.
2. Which statement describes active transport?
A. The movement of substances down a concentration gradient with no need
for energy supplied by the cell
B. The movement of substances up a concentration gradient, with no need
for energy supplied by the cell
C. The movement of substances down a concentration gradient, using energy
from respiration
D. The movement of substances up a concentration gradient, using energy
from respiration
3. The process by which water enters the root hair cell is called ______.
A. Active transport
B. Diffusion
C. Osmosis
D. Phagocytosis
4. The diagram shows the results of an experiment after 3 hours the liquid in the
glass tube rose to point X from its initial level.
In a second experiment, what change could be made to cause the liquid to rise
higher than point X after 3 hours?
A.
B.
C.
D.
A larger container with the same volume of liquid
A smaller container with the same volume of liquid
Change the sucrose solution in the visking tubing to water
Change the sucrose solution in the container to water
5. The two gas jars shown below were left for a long time to let oxygen and carbon
dioxide molecules diffused through them.
6. Which of the following is not a reducing sugar?
A. Maltose
B. Glucose
C. Galactose
D. Sucrose
7. Which carbohydrate is usually stored in the human body?
A. Glucose
B. Glycogen
C. Glycerol
D. Starch
8. The diagram below shows the breakdown of three types of organic molecules.
X
y
Z
What are the identities of X, Y and Z?
A
B
C
D
X
Carbohydrate
Carbohydrate
Protein
Protein
Y
Fat
Protein
Carbohydrate
Fat
Z
Protein
Fat
Fat
Carbohydrate
9. Which element is found in all proteins, but not in carbohydrates and fats?
A. Carbon
B. Hydrogen
C. Oxygen
D. Nitrogen
10. Which of the following is not a disaccharide sugar?
A. Maltose
B. Lactose
C. Galactose
D. Sucrose