B1 Cell Biology (2)

Question 1

What is the movement of gas particles from high to low concentration?

Answer 1

Diffusion

Question 2

In diffusion only what sized molecules can diffuse through cell membranes?

Answer 2

Small

Question 3

In diffusion, what example of small molecules can diffuse though cell membranes?

Answer 3

Oxygen and glucose

Question 4

What three factors increase the rate of diffusion across a cell membrane?

Answer 4

•High concentration gradient
•high temperature
•Large surface area

Question 5

In diffusion what is meant by a high concentration gradient?

Answer 5

Loads of particles on one side and hardly any on the other

Question 6

What is Diffusion?

Answer 6

Movement of gas particles from high to low concentration

Question 7

What is meant by the movement of water molecules from high to low concentration across partially permeable membrane?

Answer 7

Osmosis

Question 8

What is osmosis?

Answer 8

Movement of water particles from high to low concerntration across partially permeable membrane

Question 9

What is active transport?

Answer 9

Movement of substances against concentration gradient (low to high concentration)

Question 10

Active transport requires energy from what?

Answer 10

Respiration

Question 11

What process allows mineral ions to be absorbed from soil to root hair cells?

Answer 11

Active transport

Question 12

What process allows glucose to be absorbed into the bloodstream from gut?

Answer 12

Active transport

Question 13

Mineral ions being absorbed from soil into root hair cells is for what?

Answer 13

Plant growth

Question 14

Glucose being absorbed into the bloodstream from the gut is for what?

Answer 14

Cell respiration

Question 15

Do single celled organisms have a larger or smaller SA: Vomume ratio?

Answer 15

Larger

Question 16

With single celled organisms, enough substances can pass across the outer surface to what?

Answer 16

Meet the needs of the organism

Question 17

Exchange surfaces are required for multi cellular organisms because have too many cells to get what? in and out?

Answer 17

Substances

Question 18

Exchange Surfaces typically have 4 things:

Answer 18

•large surface area
•Thin membrane
•Good blood supply
•Ventilation

Question 19

Large surface area is a feature of what?

Answer 19

Exchange surfaces

Question 20

Thin membrane is a feature of what?

Answer 20

Exchange surfaces

Question 21

Good blood supply is a feature of what?

Answer 21

Exchange surfaces

Question 22

Ventilation is a feature of what?

Answer 22

Exchange surfaces

Question 23

Why is a large surface area good for exchange surfaces?

Answer 23

Lots can diffuse at once

Question 24

Why is a thin membrane is good for exchange surfaces?

Answer 24

Short diffusion distance

Question 25

What are the 4 organs adapted for exchange?

Answer 25

•Leaves •Gills •Small intestine •Alveoli

Question 26

What exchange is leaves adapted for?

Answer 26

Gas exchange

Question 27

What exchange are gills adapted for?

Answer 27

Gas exchange in fish

Question 28

What exchange is small intestines adapted for?

Answer 28

Absorption of food molecules from gut to blood

Question 29

What exchange is Alveoli in lungs adapted for?

Answer 29

Gas exchange

Question 30

Leaves are adapted for gas exchange as they have a large surface area, shown by there what?

Answer 30

Flat shape

Question 31

Gills are adapted for gas exchange in fish as they have a large surface area, shown by what?

Answer 31

Lots of gill filaments

Question 32

Small intestines are adapted for absorption of food molecules from gut to blood, shown by their large surface area as they are what?

Answer 32

Covered in villi

Question 33

Small intestines are adapted for absorption of food molecules from gut to blood, shown by their thin membrane as they have what?

Answer 33

A Single layer of surface cells

Question 34

Alveoli in lungs is adapted for gas exchange as it has a large surface area, shown by the what?

Answer 34

Millions of alveoli

Question 35

Alveoli in lungs is adapted for gas exchange as it has a thin membrane, shown by its what?

Answer 35

Thin walls

Question 36

Alveoli in lungs is adapted for gas exchange as it has a good blood supply, shown by its what?

Answer 36

Capillary network

Question 37

Small intestines are adapted for absorption of food molecules from gut to blood, shown by their good blood supply as they have what?

Answer 37

A capillary network