_____ 1. What are all living things composed of?

Aonly one cell

Bone or more cells

Cat least 100 cells

Dat least a trillion cells

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

A10%

B50%

C70%

D99%

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

ADNA

Blight

Chunger

Dsound

_____ 4. What is DNA?

Acarbohydrate

Bprotein

Cnucleic acids

Bamino acids

_____ 5. What is true of all organisms?

AOrganisms grow and develop.

BOrganisms always remain the same size.

COrganisms grow but never develop.

DOrganisms always shrink and divide.

_____ 6. Which of the following characteristics is shared by all organisms?

AAll organisms are composed of two cells.

CAll organisms can move.

BAll organisms can smell and taste.

DAll organisms have cells that contain DNA.

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

Athe membrane

Bthe cell

Cthe stimulus

Dthe metabolism

_____ 8. How do organisms carry out chemical activities of life?

Athrough sexual reproduction

Cby using energy

Bthrough asexual reproduction

Dby increasing metabolism

Fill in the blanks below using the following terms:


asexual reproduction sexual reproduction

1. Most single-celled organisms produce offspring by ____________________ ____________________.
   
   
2. In the process of ____________________ ____________________, two parents produce offspring with traits of both parents.