B2, B3, B4

Question 1

What is the definition of osmosis?

Answer 1

Osmosis is the movement of water molecules through a partially permeable membrane eg cell membrane

Question 2

What is crenation?

Answer 2

Animal cells placed in concentrated solution will lose water and therefore shrivel

Question 3

What is lysis?

Answer 3

Animal cells placed in a dilute solution will take in water and therefore burst

Question 4

How do you find the magnification

Answer 4

Size of image divided by the size of real object

Question 5

How do you find size of real object

Answer 5

Size of image divided by magnification

Question 6

What is the cytoplasm

Answer 6

A liquid gel where all chemical reactions take place needed for life to exist

Question 7

What is the mitochondria

Answer 7

Structures in the cytoplasm where aerobic respiration takes place which releases energy from the cell

Question 8

Are all animals eukaryotes

Answer 8

Yes

Question 9

What do eukaryotic cells contain

Answer 9

A cell membrane cytoplasm and genetic material (DNA)

Question 10

What is an example of a prokaryotes

Answer 10

Bacteria

Question 11

Does bacteria have cell walls

Answer 11

Yes

Question 12

What are nerve cells designed to do

Answer 12

To carry electrical impulses around the body of an animal

Question 13

What are muscle cells designed to do

Answer 13

They contract and relax when in pairs to move the bones of the skeleton

Question 14

What does the nucleus do?

Answer 14

The nucleus controls all the activities of the cell and is surrounded by the nuclear membrane

Question 15

What does the cell membrane do

Answer 15

Controls the passage of substances going in and out of the cell

Question 16

What does the mitochondria do

Answer 16

Structures in the cytoplasm where aerobic respiration takes place releasing energy from the cell

Question 17

What does the ribosomes do

Answer 17

Where protein synthesis takes place making all the proteins needed in the cells

Question 18

What do the chloroplasts do

Answer 18

They contain chlorophyll which makes light running so photosynthesis can occur

Question 19

What is diffusion

Answer 19

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

Question 20

How does the rate of diffusion increase

Answer 20

• Having a large surface area
• Being thin to provide a short diffusive distance
• Being ventilated

Question 21

Carbon dioxide + water –> ??

Answer 21

Oxygen + glucose

Question 22

What is the waste product of respiration

Answer 22

Carbon dioxide

Question 23

What is the difference between osmosis and diffusion

Answer 23

Diffusion involved gas or dissolved molecules, but osmosis involves the movement of water

Question 24

What happens when cells are placed in distilled water

Answer 24

Cells swell and burst. This is called lysis

Question 25

What happens when cells are placed in concentrated salt solution

Answer 25

Cells will shrink and shrivel. This id called crenation

Question 26

What does turgid mean

Answer 26

When the cell wall is structured not to burst

Question 27

What does flaccid mean

Answer 27

When the cell shrivels it causes the cytoplasm to pull away from the cell wall so it becomes flaccid