Cells and Organisation

Question 1

How do you calculate total magnification

Answer 1

Eyepiece lens x objective lens

Question 2

Define the term resolution

Answer 2

Resolution is the ability to distinguish between two separate points in an image

Question 3

What is the role of the nucleus

Answer 3

Contains DNA in the form of chromosomes. Contains the genetic code.

Question 4

What is the role cytoplasm in a cell

Answer 4

This is where chemcial reactions take place

Question 5

What is the function of the cell membrane

Answer 5

Controls what enters and leaves the cells.

Question 6

What is function of the mitochondria is cells

Answer 6

This is the site of respiration.

Glucose + Oxyen –> Carbon dioxide + water vapour + ATP energy

Question 7

Define the word ‘magnification’

Answer 7

Magnification is how much bigger an image is compared to it’s actual size.
Can be calculated by using the IAM triange.

Question 8

Function of the cellulose cell wall

Answer 8

This is outer layer of plant cells. It is made of cellulose. It gives the plant strength and support.

Question 9

Why are ribosomes needed in a cell?

Answer 9

Ribosomes are the site (location) where proteins are made.

Question 10

Converting Units

Answer 10

nm / 1000 um / 1000 mm / 10 cm / 100 m / 1000 km

Question 11

What is the function of chloroplasts in plant cells?

Answer 11

Chloroplasts contain a green chemcial called chlorophyll. It traps sunlight energy which is needed for photosynthesis.

Question 12

What is the role of the vacuole

Answer 12

Is a space in the cytoplasm filled with cell sap. This is important for keeping the cells rigid to support the plant

Question 13

1km = ?m

Answer 13

1000m

Question 14

1m = ?cm

Answer 14

100cm

Question 15

1cm = ?mm

Answer 15

10mm

Question 16

1mm = ?um

Answer 16

1000um

Question 17

1um =?nm

Answer 17

1000nm

Question 18

Diffusion

Answer 18

The net random movement of particles from an area of high concentration to an area of low concentration.

Question 19

Higher concentration gradient —>

Answer 19

Diffusion happens faster

Question 20

Lower concentration gradient —>

Answer 20

Diffusion happens slower

Question 21

Osmosis

Answer 21

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

Question 22

Where does osmosis happen

Answer 22

Across a partially permeable membrane.

Question 23

What type of process is osmosis

Answer 23

It is a passive process

Question 24

What two things are in a dilute solution

Answer 24

More water molecules
Less solute (e.g.salt, sugar,ribena)

Question 25

What two things are in a concentrated solution

Answer 25

``` Less water molecules More solute (e.g. salt, sugar, ribena) ```

Question 26

Animal cell placed in a dilute solution is called...

Answer 26

Lysis

Question 27

Animal cell placed in a concentrated solution is called...

Answer 27

Crenated

Question 28

Plant cell placed in a dilute solution is called...

Answer 28

Turgid

Question 29

Plant cell placed in a concentrated solution is called...

Answer 29

Plasmolysed

Question 30

Active transport

Answer 30

The process by which molecules move from an area of low concentration to an area to an area of high concentration.

Question 31

Active transport requires:

Answer 31

ATP energy | Carrier proteins in the cell membrane