Topic 1 - Transport In And Out Of Cells

Question 1

What are the three ways substances are transported in and out of cells?

Answer 1

1. Diffusion
2. Osmosis
3. Active Transport

These mechanisms are essential for supporting life processes in cells.

Question 2

Define diffusion in the context of cellular transport.

Answer 2

A form of passive transport that does not require energy, where molecules move from an area of high concentration to low concentration

Molecules move in every direction and collide, but the net movement is towards lower concentration.

Question 3

What is osmosis?

Answer 3

A form of passive transport that involves the movement of water from a dilute solution to a more concentrated solution across a selectively permeable membrane

Movement can also be described as from an area of high solute concentration to lower solute concentration.

Question 4

What is the energy source for active transport?

Answer 4

ATP (adenosine triphosphate)

ATP is produced during cellular respiration.

Question 5

True or False: Active transport moves molecules from an area of high concentration to low concentration.

Answer 5

False

Active transport moves molecules against a concentration gradient.

Question 6

Fill in the blank: _______ is a form of transport that requires energy.

Answer 6

Active Transport

This process moves molecules against their concentration gradient.

Question 7

Explain the term ‘selectively permeable membrane’.

Answer 7

A membrane that allows certain substances to pass while blocking others

This property is crucial for maintaining homeostasis in cells.

Question 8

What happens during osmosis when the solute is salt?

Answer 8

Water moves from a less salty solution to a more salty solution

This movement helps balance solute concentrations on either side of a membrane.

Question 9

What type of transport involves molecules moving down their concentration gradient?

Answer 9

Passive Transport

This includes processes like diffusion and osmosis.

Question 10

In diffusion, what is the direction of net movement of molecules?

Answer 10

From high concentration to low concentration

This process continues until equilibrium is reached.