Transport Across Cell Membranes MINI DECK

Question 1

What does ‘selectively permeable’ mean?

Answer 1

A membrane that allows certain molecules to pass while blocking others

This property is crucial for maintaining homeostasis in cells.

Question 2

What is ‘passive transport’?

Answer 2

The transport of molecules that does not require energy

Examples include diffusion and osmosis.

Question 3

Define ‘diffusion’.

Answer 3

The movement of molecules from an area of high concentration to an area of low concentration

This process occurs across a selectively permeable membrane.

Question 4

What is ‘osmosis’?

Answer 4

The movement of water molecules from an area of high water concentration to an area of low water concentration

This also occurs across a selectively permeable membrane.

Question 5

What is ‘active transport’?

Answer 5

A process that moves molecules against a concentration gradient and requires energy

This is essential for maintaining cellular functions and concentrations.

Question 6

Fill in the blank: The process of moving molecules from high concentration to low concentration is called _______.

Answer 6

[diffusion]

Question 7

True or False: Osmosis requires energy to occur.

Answer 7

False

Osmosis is a type of passive transport.

Question 8

Fill in the blank: _______ is the movement of water molecules across a selectively permeable membrane.

Answer 8

[osmosis]

Question 9

What is the main difference between passive transport and active transport?

Answer 9

Passive transport does not require energy, while active transport does

Active transport is necessary for moving substances against their concentration gradient.