Transport Across Membranes

Question 0

What is meant by the term flaccid?

Answer 0

When a cell becomes soft and can no longer support the plant due to water loss

Question 1

Movement of molecules from a high to low concentration down a concentration gradient

Answer 1

Diffusion

Question 2

What does the term turgid mean?

Answer 2

the cytoplasm is pushed against the cell wall, making it stretched to the maximum and the vacuole is swollen

Question 3

What is meant by the term plasmolysed?

Answer 3

When the vacuole shrinks and the cytoplasm is pulled away from cell wall as a result of excessive water loss

Question 4

What type of solution makes a cell turgid?

Answer 4

A dilute solution

Question 5

What type of solution makes a cell plasmolysed?

Answer 5

A concentrated solution

Question 6

What is a selectively permeable membrane?

Answer 6

It controls the entry and exit of certain materials into and out of a cell

Question 7

What is osmosis?

Answer 7

It is the diffusion of water molecules from a high to a low concentration through a selectively permeable membrane

Question 8

What is the difference in concentration that exists between two regions, resulting in diffusion?

Answer 8

Concentration gradient

Question 9

Movement of molecules from low to high concentration, requiring energy

Answer 9

Active transport

Question 10

What is a solution called with a higher water concentration than another solution?

Answer 10

Hypotonic

Question 11

What is a solution called with a lower water concentration than another solution?

Answer 11

Hypertonic

Question 12

What is two solutions with the same water concentration called?

Answer 12

Isotonic

Question 13

What does the membrane have to let substances pass through?

Answer 13

Pores

Question 14

What are diffusion and osmosis also know as?

Answer 14

Passive processes

Question 15

What are carrier proteins?

Answer 15

They pick up specific molecules and move them through the cell membrane against the concentration gradient

Question 16

What do cells need to provide energy to carry out active transport?

Answer 16

Mitochondria

Question 17

What are the types of molecules that the cell membrane is made of?

Answer 17

lipid (fat) and protein

Question 18

What is the double layer that the lipid molecules form?

Answer 18

Lipid bilayer (makes the membrane strong but flexible)

Question 19

Why is the cell membrane called a fluid mosaic?

Answer 19

Because of the random arrangement of the protein molecules and how the membrane is a flexible