Cell Homeostasis Answers

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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
2
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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.
3

Which solution would most likely cause a plant placed in it to become firmer and more rigid?

A
hypertonic
B
hypotonic
C
isotonic
D
osmotic
4

Which adaptation helps polar bears maintain a constant internal temperature (thermal homeostasis) in cold weather?

A
three layers of fur
B
blubber
C
finding shade underground
D
white skin
5

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.
6

Which homeostatic process moves particles against a concentration gradient?

A
dynamic equilibrium
B
passive transport
C
osmosis
D
active transport
7

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
8

Which best describes dynamic equilibrium?

A
There is a difference in concentration on either side of the cell membrane.
B
There is an uneven distribution of particles inside and outside the cell.
C
Particles are moving into and out of the cell, but their concentrations remain stable.
D
A concentration gradient is forcing water out of the cell and particles into the cell.
9

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
10

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.

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Cell Homeostasis Answers — GCS 2025-2026 Biology…