Chapter 3. 3·8–3·11 Molecules move across membranes in several ways.

Show What You Know - Self Quiz

true

You must read each slide, and complete any questions on the slide, in sequence.

Instructions

Check your understanding of concepts from 3·8–3·11 Molecules move across membranes in several ways by answering the following questions.

1.

1. Which of the following is an example of osmosis?

flow of water out of a cell

pumping of water into a cell

flow of water between cells

Both A and B are correct.

Both A and C are correct.

Correct! (See section 3·9 Osmosis is the passive diffusion of water across a membrane.)

Incorrect. (See section 3·9 Osmosis is the passive diffusion of water across a membrane.)

2.

2. Which of the following is an INCORRECT comparison between facilitated and simple diffusion?

Facilitated diffusion uses a facilitated diffusion carrier, while simple difussion uses a simple diffusion carrier.

Facilitated diffusion uses transport proteins on the membrane's surface, while simple diffusion uses transport lipids.

Facilitated diffusion is necessary to maintain an equilibrium inside the cell, while simple diffusion is not necessary for cellular function.

Facilitated diffusion can function at a very high rate, while simple diffusion is always relatively slow.

All of the above are INCORRECT comparisons between facilitated and simple diffusion.

Correct! (See section 3·8 Passive transport is the spontaneous diffusion of molecules across a membrane.)

Incorrect. (See section 3·8 Passive transport is the spontaneous diffusion of molecules across a membrane.)

3.

3. If a cell is put into a solution with a higher concentration of solute than is present inside the cell, the solution is ____________. The cell will __________. If a cell is put into a solution with a lower concentration of solute than is present inside the cell, the solution is _____________. The cell will _________.

hypertonic; shrink; hypotonic; swell

hypotonic; shrink; hypertonic; swell

hypotonic; swell; hypertonic; shrink

hypertonic; swell; hypotonic; shrink

None of the above is correct.

Correct! (See section 3·9 Osmosis is the passive diffusion of water across a membrane.)

Incorrect. (See section 3·9 Osmosis is the passive diffusion of water across a membrane.)

4.

4. The transport of large molecules into the cell, across the membrane is accomplished via:

endocytosis.

active transport.

facilitated diffusion.

exocytosis.

passive transport.

Correct! (See section 3·11 Endocytosis and exocytosis are used for bulk transport of particles.)

Incorrect. (See section 3·11 Endocytosis and exocytosis are used for bulk transport of particles.)

5.

5. Mammalian cells take in many molecules including hormones, antibodies, and blood proteins. This process is coordinated by proteins that recognize their specific target molecule. This process is best described as:

diffusion.

cell absorption.

cohesion.

cell inclusion.

receptor-mediated endocytosis.

Correct! (See section 3·11 Endocytosis and exocytosis are used for bulk transport of particles.)

Incorrect. (See section 3·11 Endocytosis and exocytosis are used for bulk transport of particles.)

Activity results are being submitted...