Cell Transport Summative Assessment

1. What is the cell membrane made of?

• nucleic acids
• amino acids
• carbohydrates
• phospholipids

2. The cell membrane is said to be selectively permeable. Which of the following best describes this characteristic?

• allowing the passage of all substances through the membrane
• allowing the passage of only polar substances through the membrane
• allowing the passage of some substances through the membrane but not others
• not allowing any substances through the membrane

3. What is the function of the cell membrane? Check all that apply.

• serves as a boundary between the outside and inside of the cell
• controls what moves into and out of the cell
• produces proteins to be exported from the cell
• helps cells maintain homeostasis

4. In which direction do molecules move during diffusion?

• equally in both directions
• from high concentration to low concentration
• from low concentration to high concentration
• the molecules do not move during diffusion

5. Food coloring spreading out in a beaker of water is an example of

• diffusion.
• active transport.
• exocytosis
• osmosis.

6. Molecules will continue to move across the membrane until they reach

• the nucleus
• the other side of the cell.
• equilibrium.
• turgor pressure.

7. Which of the following is a characteristic of facilitated diffusion?

• It requires a carrier protein.
• It moves substances against a concentration gradient.
• it is a type of active transport
• It requires energy input.

8. The diffusion of water is called

• solubility.
• selective transport.
• diffusion
• osmosis.

9. Which molecule supplies the energy needed in active transport?

• ATP
• DNA
• lipids
• glucose

10. When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria use energy to try to pump the antibiotic out of their cells. Which of the following mechanisms is used by the Streptococcus pneumoniae to pump the antibiotic out of their cells?

• active transport
• diffusion
• osmosis
• facilitated diffusion