_____ 1. What are all living things composed of?

a. only one cell

b. one or more cells

c. at least 100 cells

d. at least a trillion cells

_____ 2. About how much of the human body is water?

a. 10%

b. 50%

c. 70%

d. 99%

_____ 3. Which of the following is NOT a stimulus that living things sense and respond to?

a. DNA

b. light

c. hunger

d. sound

_____ 4. What is DNA?


a. carbohydrate

b. protein

c. nucleic acids

b. amino acids

_____ 5. What is true of all organisms?

a. Organisms grow and develop.

b. Organisms always remain the same size.

c. Organisms grow but never develop.

d. Organisms always shrink and divide.

_____ 6. Which of the following characteristics is shared by all organisms?
a. All organisms are composed of two cells.

c. All organisms can move.
b. All organisms can smell and taste.

d. All organisms have cells that contain DNA.

_____ 7. What is the smallest functional and structural unit of life?
a. the membrane

b. the cell

c. the stimulus

d. the metabolism

_____ 8. How do organisms carry out chemical activities of life?
a. through sexual reproduction

c. by using energy
b. through asexual reproduction

d. by increasing metabolism

Fill in the blanks below using the following terms:

asexual reproduction sexual reproduction

9. Most single-celled organisms produce offspring by ____________________ ____________________.

10. In the process of ____________________ ____________________, two parents produce offspring with traits of both parents.