Cell Homeostasis Answers

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Water makes up a large percentage of the body’s cells. For a cell to remain in homeostasis, there must be a mechanism to control water changes in the cells. The movement of water from an area of high water concentration to an area of low water concentration is

A
diffusion
B
osmosis
C
active transport
D
stable transport
2
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In which kind of solution is the concentration of solutes the same inside and outside of the cell?

A
isotonic
B
hypertonic
C
hypotonic
D
concentrated
3

Which motion of particles across a membrane requires energy?

A
from high concentration to low concentration
B
from low concentration to high concentration
C
with no concentration gradient
D
through dynamic equilibrium
4

Reptiles and birds excrete waste as an insoluble white solid that is called uric acid. How does this help them to maintain internal homeostasis in hot climates?

A
by retaining water
B
by conserving energy
C
by reducing body temperature
D
by maintaining heart rate
5

Which homeostatic process requires energy to move particles across the plasma membrane?

A
active transport
B
passive transport
C
dynamic equilibrium
D
osmosis
6

Which statement describes the ability of the cell membrane to allow various substance to move through it?

A
The cell membrane is selectively permeable.
B
The cell membrane is composed of lipids and phosphates.
C
The cell membrane is both hydrophilic and hydrophobic.
D
The cell membrane is a bilayer structure.
7

How does the contractile vacuole in a single-celled organism function to maintain homeostasis?

A
It pumps water into the cell.
B
It pumps water out of the cell.
C
It pumps solutes into the cell.
D
It pumps solutes out of the cell.
8

What would most likely happen to a unicellular organism if it was exposed to a hypotonic solution for an extended period of time?

A
It would shrivel and shrink.
B
It would swell but never burst.
C
It would swell and then burst.
D
It would not be affected.
9

The data in the graph are the result of a paramecium being placed in a hypertonic salt solution.What change would most improve the usefulness of the graph?

Question illustration
A
Replace the concentration descriptions with actual values.
B
Plot contractions per second instead of contractions per minute.
C
Remove the plotted points and just keep the line.
D
Remove the name of the organism from the title.
10

Which process is characterized by the movement of particles from an area of high concentration to an area of low concentration across the plasma membrane without the use of energy?

A
hypertonic transport
B
active transport
C
passive transport
D
dynamic equilibrium

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Cell Homeostasis Answers — 26-27 RPA- Biology 12…