Week 2 Quiz

1) Diffusion is the net movement of molecules from a _________ concentration to a _________ concentration.

• high/low
• low/high
• medium/high
• low/medium

2) These molecules make up the bilayer of the cell membrane.

3) Which of the following make up the cell membrane? Pick all that apply.

• Carbohydrates
• Lipids
• Proteins
• Nucleic Acids

4) Which molecule is embedded and functions for ions and molecules can travel into and out of the cell?

• cholesterol
• integral protein
• peripheral protein
• glycoprotein

5) Which molecule serves as recognition and reception?

• cholesterol
• integral protein
• peripheral protein
• glycoprotein

6) What are the two parts of a phospholipid? (Write your answer as 2 words with "and" between them; ______ and ______)

7) Once equilibrium is reached, molecules will continue to move across a membrane....

• in one direction
• uniformly
• randomly
• all at once

8) If molecules go DOWN the concentration gradient of a cell, energy is being used.

• True
• False

9) What kind of molecules can go directly across the membrane? (Choose all that apply.)

• Ions
• Small polar molecules
• Large molecules (like sugars)
• Small nonpolar molecules

In Diffusion, substances move from…

• High to Low Concentration
• Low to High Concentration