B1.2

Question 1

What is the roll of the nucleus

Answer 1

Controls the activities of the cell. It contains the genes and chromosomes needed to make new cells and organisms

Question 2

What is the roll of a cytoplasm

Answer 2

This is a liquid gel where most of the chemical reactions for the cell happens

Question 3

What is the roll of the cell membrane

Answer 3

Controls what comes in and out of the cell

Question 4

What is the roll of mitochondria

Answer 4

These are the organelles where respiration occurs. Oxygen and glucose are reacted to release energy

Question 5

What is the roll of ribosomes

Answer 5

This is where protein synthesis takes place. All the proteins needed in the cell are made here

Question 6

What is the roll of a cell wall

Answer 6

Made of cellulose. Gives the cell structure and the plant strength and support

Question 7

What are the roll of chloroplasts

Answer 7

Found in the green parts of the plan, site of photosynthesis

Question 8

What are the roll of chloroplasts

Answer 8

Found in the green parts of the plan, site of photosynthesis

Question 9

What is the roll of a permanent vacuole

Answer 9

Filled with sap. Important to support the plan by keeping the cells rigid

Question 10

What are the two important things regarding chloroplasts

Answer 10

1. They are not found in ever cell in the plant only the ones which photosynthesise
2. chloroplasts contains chlorophyll which is the chemical needed for photosynthesis. They are not the same thing

Question 11

Required practical: how to prepare a slide

Answer 11

1. Separate a thin layer of onion and add to the slide
2. Out two drops of iodine on to the onion tissue
3. Lower coverslip on to slide using mounted needle to help you- make sure there is no air bubbles
4. Use a piece of filter paper to soak up any excess liquid

Question 12

What is the additional practical in this topic

Answer 12

1. Swan the inside of your mouth
2. Rub the end of the swab on to the centre of a clean dry slide
3. Add a drop of methylene blue stain
4. Gently lower the cover slip, using the mounted needle on to the specimen
5. Use filter paper to remove any excess stain
6. View first using the lowest power of magnification

Question 13

How to set up the microscope

Answer 13

1. Plug in the microscope and turn on the light
2. Place your prepared onion slide on the stage, ensuring the specimen is in the center and secure with clips
3. Then the objective lens to its lowest magnification. This provides the biggest field of view to its easier to focus
4. Looking through the eyepiece and using the coarse focusing wheel, then it until the cells are in focus
5. Use the fine focus to bring the cells into clear focus
6. Repeat this process switching to a higher power
7. Draw and label a diagram of the cells, maginificafion scale must be included

Question 14

Name structures you would expect to find in a human cell

Answer 14

Nucleus, cell membrane, cytoplasm, mitochondria, ribosomes

Question 15

Name featured you would find in plant cells but not animal cells

Answer 15

Cell wall, permanent vacuole and chloroplasts

Question 16

What is the cell wall made from

Answer 16

Cellulose

Question 17

What is the role of the mitochondria in cells

Answer 17

Release energy from respiration

Question 18

Name a plant cell that would not contain chloroplasts

Answer 18

Root hair cell

Question 19

When using a microscope why do you always start on the lowest magnification

Answer 19

Bigger field of view so it’s easier to focus

Question 20

How do you minimise air bubbles when preparing a slide

Answer 20

Lower cover slip using a mounted needle