Multiple choice

1. The tiny particles that comprise an element are called

A. ions. 

B. protons. 

C. atoms.

D. nuclei.

2. In cells, a form of active transport is

A. osmosis. 

B. a sodium-potassium pump. 

C. simple diffusion.

D. facilitated diffusion.

3. In the leaves of flowering plants, where does the process of photosynthesis occur?

A. In chloroplasts 

B. In stomata 

C. In glucose

D. Between chlorophylls

4. According to the octet rule, an atom with two electron shells is most stable when it contains eight

A. protons. 

B. isotopes. 

C. electrons.

D. neutrons.