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Bio Chapter 5 Quiz
| Question | Answer |
|---|---|
| Which characteristic of a phospholipid contributes to the fluidity of the membrane? a. its head b. cholesterol c. a saturated fatty acid tail d. double bonds in the fatty acid tail | d. double bonds in the fatty acid tail |
| What is the primary function of carbohydrates attached to the exterior of cell membranes? a. identification of the cell b. flexibility of the membrane c. strengthening the membrane d. channels through membrane | a. identification of the cell |
| Water moves via osmosis _________ a. throughout the cytoplasm b. from high concentration of other solutes to a lower one c. high concentration of water to lower concentration d. from low concentration of water to higher concentration | c. from an area with a high concentration of water to one of lower concentration |
| The principal force driving movement in diffusion is the ______ a. temperature b. particle size c. concentration gradient d. membrane surface area | c. concentration gradient |
| What problem is faced by organisms that live in fresh water? a. their bodies tend to take in too much water b. they have no way of controlling their tonicity c. their bodies tend to lose too much water to their environment | a. their bodies tend to take in too much water |
| Active transport must function continuously because _______ a. plasma membranes wear out b. not all membranes are amphiphilic c. facilitated transport opposes active transport d. diffusion is constantly moving solutes in opposite directions | d. diffusion is constantly moving solutes in opposite directions |
| How does the sodium-potassium pump make the interior of the cell negatively charged? a. by expelling anions b. by pulling anions c. by expelling more cations than are taken in d. by taking in and expelling an equal number of cations | c. by expelling more cations than are taken in |
| What is the combination of an electrical gradient and a concentration gradient called? a. potential gradient b. electrical potential c. concentration potential d. electrochemical gradient | d. electrochemical gradient |
| What happens to the membrane of a vesicle after exocytosis? a. it leaves the cell b. it is disassembled by the cell c. it fuses with and becomes part of the plasma membrane d. it is used again in another exocytosis event | c. it fuses with and becomes part of the plasma membrane |
| Which transport mechanism can bring whole cells into a cell? a. pinocytosis b. phagocytosis c. facilitated transport d. primary active transport | b. phagocytosis |
| In what way does receptor-mediated endocytosis differ from phagocytosis? b. it doesn't involve the pinching off of membrane c. it brings in only a specifically targeted substance d. it brings substances in, while phagocytosis removes substances | c. it brings in only a specifically targeted substance |
Created by:
mortehay000
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