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Biology-Holt Chap 4 Cells and Their Environment

Authored by Theresa Vonbecker

Biology

9th - 12th Grade

Used 1+ times

Biology-Holt Chap 4 Cells and Their Environment
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29 questions

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1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Why is it dangerous for humans to drink sea water? Choose two options.

Water would enter our cells through osmosis.resulting in dehydration.

Water would leave our cells through osmosis, resulting in dehydration.

Drinking sea water increases the concentration of salts in body fluids.

Drinking sea water decreases the concentration of salts in body fluids.

2.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

How does the sodium potassium pump work? Choose 2 options.

using energy from ATP, transports 3 potassium ions out of the cell, and brings in 2 sodium ions from outside the cell.

the ions move against their concentration gradient.

the ions move with(down) their concentration gradient.

using energy from ATP, transports 3 sodium ions out of the cell, and brings in 2 potassium ions from outside the cell.

3.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Why is the sodium potassium pump important?

This process prevents potassium from building up in the cell.

This process prevents sodium from building up in the cell. which can be toxic.

This process helps maintain the concentration gradients of sodium and potassium ions across the cell membrane.

This process helps maintain the pinocytosis of sodium and potassium ions across the cell membrane.

4.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Describe 3 ways in which the binding of a signal molecule to a receptor protein can change the activities of the receiving cell.

The receptor protein can act as an enzyme, chemically changing the molecules in the cytoplasm by activating other enzymes in the cell.

The receptor protein may cause the formation of a second messenger that can change the functioning of the cell by activating other enzymes or opening ion channels.

The receptor protein can cause channels in the membrane to open which changes the permeability of the cell membrane.

The receptor protein can cause channels in the membrane to disappear.

5.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Difference between diffusion and active transport. Choose 3 options.

Active transport requires energy to move particles against their concentration gradient.

Active transport only occurs in cells, but diffusion can occur anywhere that a concentration gradient exists.

Active transport can occur anywhere a concentration gradient exists but diffusion only occurs in cells.

Diffusion is the random movement of a substance down its concentration gradient and does not require energy

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The movement of free water molecules from high concentration to lower concentration is

exocytosis

endocytosis

osmosis

active transport

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Shields molecule from interior of lipid bilayer

equilibrium

carrier protein

second messenger

exocytosis

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