Clicker quiz 2!Have your clickers ready!

1. Cell membranes are made up (mostly) of:

1 2 3 4

25% 25%25%25%1. Proteins and complex carbs

2. Complex carbs and lipids

3. Lipids and proteins

4. Proteins and nucleic acids

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30

2. Which particles can diffuse directly through the lipid bilayer?

1 2 3 4

25% 25%25%25%1. Ions2. Small polar

molecules3. Gases4. Large non-polar

molecules

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30

3. Diffusion if ions through the cell membrane occurs through:

1 2 3 4

25% 25%25%25%1. Phospholipid bilayer

2. Channel proteins

3. Receptor proteins

4. Thin portions of the membrane

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30

4. Osmosis is:

1 2 3 4

25% 25%25%25%1. The opposite of diffusion.

2. A synonym for diffusion.

3. The diffusion of water through a membrane.

4. Absorption of any substance.

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5. If a solution has more salt than the interior of a cell, the solution is:

1 2 3

33% 33%33%1. Hypertonic2. Hypotonic3. Isotonic

when compared with the interior of the cell.

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30

6. Water entered the osmometer in last week’s lab because it was placed in a ____ solution.

1 2 3

33% 33%33%

1. Hypertonic2. Hypotonic3. Isotonic

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30