KS3 Cells Recap

• Biology
• Upper Secondary (Key Stage 4)
• GCSE

What is the function (job) of A?

1. Releasing energy through respiration.
2. Site of chemical reactions in the cell.
3. Controls what enters and exits the cell.
4. Contains DNA and controls the cell.

Nucleus

Cell membrane

Mitochondria

Cytoplasm

Structure

Function

Controls what enters and leaves the cell.

Contains DNA and controls the cell processes.

The site of respiration.

The site of chemical reactions in the cell.

Cell membrane

Mitochondria

Nucleus

Cytoplasm

Why might a muscle cell need lots of mitochondria?

Nucleus

Chloroplast

Mitochondria

Cytoplasm

Cell membrane

Cell wall

Vacuole

Which part of the cell is found in an animal cell and a plant cell.

1. Chloroplast
2. Nucleus
3. Cell wall
4. Vacuole

1. Animal cell
2. Plant cell

Structure

Function

Controls what enters and leaves the cell.

Contains DNA and controls the cell processes.

The site of respiration.

The site of chemical reactions in the cell.

Storing cell sap and keeping the cell rigid.

The site of photosynthesis. Contains chlorophyll.

Protects and supports the cell.

Cell membrane

Chloroplast

Cell wall

Vacuole

Mitochondria

Nucleus

Cytoplasm

Compare the functions (jobs) of the cell wall and the cell membrane.

Which letter controls what enters and leaves the cell?

1. A
2. B
3. C

What is the name of B?

1. Nucleus
2. Cytoplasm
3. Cell membrane
4. Mitochondria

Match the parts of a cell to their function

nucleus

ribosomes

cell membrane

mitochondria

chloroplasts

cytoplasm

cell wall

vacuole

Where does photosynthesis take place?

1. Cytoplasm
2. Vacuole
3. Chloroplast
4. Mitochondria

Which of the below is the site of energy release?

1. Cytoplasm
2. Vacuole
3. Chloroplast
4. Mitochondria

Which of the below is the site of most chemical reactions?

1. Cytoplasm
2. Vacuole
3. Chloroplast
4. Mitochondria

Which of the below contains cell sap and supports the cell

1. Cytoplasm
2. Vacuole
3. Chloroplast
4. Mitochondria

Which of the below produces proteins?

1. Cell wall
2. Ribosomes
3. Cell membrane
4. Nucleus

Which of the below controls what enters and leaves the cell?

1. Cell wall
2. Ribosomes
3. Cell membrane
4. Nucleus

02:40

If he used a x20 objective lens what would the total magnification be?

1. x20
2. x10
3. x200
4. x2000

03:47

Why is important to have a very thin sample?

04:59

Where does the slide go?

1. Objective lens
2. Stage
3. Base
4. Under the eyepiece

09:14

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Change to a higher power objective lens making sure it doesn't touch the sample

Ensure the lowest magnification lens is in place

Look at the sample from the side and move the lens/stage as close as possible

readjust focus if needed by making small movements of the fine focus knob

Carefully use the coarse focus knob to move the lens and focus the slide

After the coarse focus, use the fine focus for smaller adjustments

Fine Focus

Coarse Focus

Eyepiece

Slide Clips

Objective Lens

Stage

Light

Exam question practice

Describe how the student should adjust the microscope to see the cells on Slide A more clearly.
(1 mark)

Markscheme

 turn the (fine focusing) knob until the cells are in focus

allow focus it

do not accept increase magnification

ignore decrease magnification

ignore clear

ignore references to resolution / illumination

ignore zoom in / out

1

Describe how the student should adjust the microscope to see the cells on Slide B more clearly.
(2 marks)

Markscheme

  (rotate the) nosepiece / objective lens

allow change the (objective / eyepiece) lens

1

to a higher power (lens)

allow (to) increase the magnification

a comparator is required

ignore change / adjust the magnification

allow stronger or more powerful lens

ignore references to resolution / illumination unqualified

ignore zoom in / out

ignore references to an electron microscope

1