1 

2.  Nerve cells are essential to an animal because they directly provide

a.	 Communication between cells
b.	Transport of nutrients to various organs
c.	Regulation of reproductive rates within other cells
d.	An exchange of gases within the body

3.

4.  The cells that make up the skin of an individual have some functions different from the cells that make up liver because
a. all cells have a common ancestor
b. different cells have different genetic material
c. environment and past history have no influence on cell function
d. different parts of genetic instructions are expressed in different cells

5 
Some human body cells are shown in the diagrams below.

These groups of cells represent different

(1) tissues in which similar cells function together           (2) organs that help to carry out a specific life activity
(3) systems that are responsible for a specific life activity      (4) organelles that carry out different functions
	
6 
The diagram below represents an event that occurs in the blood.

Which statement best describes this event?
(1) Cell A is a white blood cell releasing antigens to destroy bacteria.
(2) Cell A is a cancer cell produced by the immune system and it is helping to prevent disease.
(3) Cell A is a white blood cell engulfing disease-causing organisms.
(4) Cell A is protecting bacteria so they can reproduce without being destroyed by predators.	
7 
The diagram below represents two cells, X and Y.

Which statement is correct concerning the structure labeled A?

(1) It aids in the removal of metabolic wastes in both cell X and cell Y.
(2) It is involved in cell communication in cell X, but not in cell Y.
(3) It prevents the absorption of CO2 in cell X and O2 in cell Y.
(4) It represents the cell wall in cell X and the cell membrane in cell Y.

	
8 
Which diagram best represents the levels of organization in the human body?

	
9 

Identify an organelle in cell A that is the site of autotrophic nutrition. [1]
__________________________________________	
10 

Which statement best describes these cells?
(1) Cell B lacks vacuoles while cell A has them.
(2) DNA would not be found in either cell A or cell B.
(3) Both cell A and cell B use energy released from ATP.
(4) Both cell A and cell B produce antibiotics.
	
11 
The diagram below represents a plant cell in tap water as seen with a compound light microscope.

Which diagram best represents the appearance of the cell after it has been placed in a 15% salt solution for two minutes?

12 
In the cell shown below, which lettered structure is responsible for the excretion of most cellular wastes?

(1)	A          (2) B         (3) C              (4) D
	
13 
What is the main function of a vacuole in a cell?

(1) storage
(2) coordination
(3) synthesis of molecules
(4) release of energy 	
14 
The diagram below shows molecules represented by X both outside and inside of a cell.

A process that would result in the movement of these molecules out of the cell requires the use of 
A.	DNA
B.	ATP
C.	Antigens
D.	Antibodies

15 

The trend shown on the graph would most likely result in

(1) a decreased demand for deforestation

(2) an increase in available freshwater

(3) a decrease in air pollution

(4) an increased demand for land use

The graph below shows data on human population growth.