Chapter 3 Section 2

Question 1

All cells are surrounded by a ____, these are said to be ________. The exchange of materials between a cell and its environments takes place at the cell’s membrane.

Answer 1

cell membrane

selectively permeable

Question 2

What does selectively permeable mean?

Answer 2

The pores in the cell membrane allow only certain particles to pass in and out of the cell

Question 3

Define DIFFUSION

Answer 3

The process in which small particules move across a selectively permeable membrain from an area of high concentration to an area of low concentration using no energy

Question 4

Is energy needed for diffusion?

Answer 4

no

Question 5

In what direct do molecules move during diffusion?

Answer 5

High to low

Question 6

Suppose a permeable membrane separates sugar solutions with concentrations of 5g/L an 7g/L.

Answer 6

The sugar will move from an area of high concentration (7 g/L) to an area of low concentration (5g/L)

Question 7

_______ is the diffusion of water molecules through a selectively permeable membrane.

Answer 7

Osmosis

Question 8

Calls cannot function properly without an adequate supply of _____. This is why osmosis is important.

Answer 8

Water!

Question 9

If a plant is wilted, then I water it.

What is the result of the plant and why is this happening?

Answer 9

The water is pulled from the roots of the cell. The water fills the vacuole and the plant becomes firm again. This is the process of OSMOSIS.

Question 10

Draw a picture and use words describing passive transport. Give examples of the substances being moved.

Answer 10

Passive transport is diffusion and osmosis.

Examples of what is being moved are oxygen and water.

Question 11

Moving small particles can be done in 2 ways. What are those ways? Do they require energy?

Answer 11

Active and Passive Transport.
Energy is required for Active.
Energy is not required for Passive.

Question 12

Draw a picture and use words describing active transport.Give examples of substances being moved.

Answer 12

Active transport is the process in which particles move across a selectively permeable membrane from an area of low concentration to an area of high concentration using energy.

Question 13

Moving large particles can be done in 2 ways. What are those 2 ways? These 2 ways also use active transport.

Answer 13

Endocytosis and exocytosis

Question 14

Explain the process of endocytosis and exocytosis. Give examples of what is being moved. Use pictures and words to help you.

Answer 14

HANDOUT?

Protein and single celled organisms are what is being moved.