Cell Homeostasis Answers

0 verified answers
1
Free Preview

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
Free Preview

Which best describes the difference between osmosis and diffusion?

A
Osmosis is the movement of particles from a high to a low particle concentration, while diffusion is the movement of water from a high to a low water concentration.
B
Diffusion is the movement of particles from a high to low particle concentration, while osmosis is the movement of water from a high to a low water concentration.
C
Diffusion is the movement of particles from a low to a high particle concentration, while osmosis is the movement of water from a low to a high water concentration.
D
Osmosis is the movement of particles from a low to a high particle concentration, while diffusion is the movement of water from a low to a high water concentration.
3

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
4

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
5

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
6

For diffusion to occur, which condition must be met?

A
A concentration gradient must exist.
B
A hypotonic external environment must exist.
C
A hypertonic external environment must exist.
D
Dynamic equilibrium must exist.
7

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

A
active transport
B
passive transport
C
dynamic equilibrium
D
osmosis
8

Which homeostatic process moves particles against a concentration gradient?

A
dynamic equilibrium
B
passive transport
C
osmosis
D
active transport
9

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.
10

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

Did you find these answers helpful?