Cell Membrane Part 2 Virtual Lab

Figure 5.12 Osmotic pressure changes the shape of red blood cells in hypertonic, isotonic, and hypotonic

solutions. (credit: Mariana Ruiz Villareal)

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Figure 5.16 Electrochemical gradients arise from the combined effects of concentration gradients and electrical

gradients. (credit: “Synaptitude”/Wikimedia Commons)

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Figure 5.19 An electrochemical gradient, created by primary active transport, can move other substances against

their concentration gradients, a process called co-transport or secondary active transport. (credit: modification of

work by Mariana Ruiz Villareal)

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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. Only salt water poses problems for animals that

live in it.

d. Their bodies tend to lose too much water to their

environmen

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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

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How does the sodium-potassium pump make the
interior of the cell negatively charged?

a. by expelling anions

b. by pulling in anions

c. by expelling more cations than are taken in

d. by taking in and expelling an equal number of

cations

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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

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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.

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Which transport mechanism can bring whole cells into
a cell?

a. pinocytosis

b. phagocytosis

c. facilitated transport

d. primary active transport

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In what important way does receptor-mediated
endocytosis differ from phagocytosis?

a. It transports only small amounts of fluid.

b. It does not involve the pinching off of

membrane.

c. It brings in only a specifically targeted

substance.

d. It brings substances into the cell, while

phagocytosis removes substances.

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Where does the cell get energy for active transport
processes?

Endoplasmic Reticulumn

Necliouse

Mitochondrians

Vesicels

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Cell Membrane Part 2 Virtual Lab

What problem is faced by organisms that live in freshwater?

Active transport must function continuously because__________.

How does the sodium-potassium pump make theinterior of the cell negatively charged?

What is the combination of an electrical gradient and aconcentration gradient called?

What happens to the membrane of a vesicle afterexocytosis?

Which transport mechanism can bring whole cells intoa cell?

In what important way does receptor-mediatedendocytosis differ from phagocytosis?

Where does the cell get energy for active transportprocesses?

What problem is faced by organisms that live in freshwater?

Active transport must function continuously because__________.

How does the sodium-potassium pump make theinterior of the cell negatively charged?

What is the combination of an electrical gradient and aconcentration gradient called?

What happens to the membrane of a vesicle afterexocytosis?

Which transport mechanism can bring whole cells intoa cell?

In what important way does receptor-mediatedendocytosis differ from phagocytosis?

Where does the cell get energy for active transportprocesses?

What problem is faced by organisms that live in fresh
water?

Active transport must function continuously because
__________.

How does the sodium-potassium pump make the
interior of the cell negatively charged?

What is the combination of an electrical gradient and a
concentration gradient called?

What happens to the membrane of a vesicle after
exocytosis?

Which transport mechanism can bring whole cells into
a cell?

In what important way does receptor-mediated
endocytosis differ from phagocytosis?

Where does the cell get energy for active transport
processes?

What problem is faced by organisms that live in fresh
water?

Active transport must function continuously because
__________.

How does the sodium-potassium pump make the
interior of the cell negatively charged?

What is the combination of an electrical gradient and a
concentration gradient called?

What happens to the membrane of a vesicle after
exocytosis?

Which transport mechanism can bring whole cells into
a cell?

In what important way does receptor-mediated
endocytosis differ from phagocytosis?

Where does the cell get energy for active transport
processes?