Cells

Question 1

How do you work out the :

High power field of view ?

Answer 1

Low power magnification
————————– X low power f.o,v
High power magnification

Question 2

How do you work out the size of a cell

Answer 2

No of cells that fit across

Question 3

How do you work out the scale?

Answer 3

Cell size

Question 4

1 mm is equal to how many micrometers (um)

Answer 4

1000um

Question 5

The cell membrane does what?

Answer 5

Forms a border around the cell and the nucleus, it allows nutrients to enter and leave the cell

Question 6

Endoplasmic reticulum

Answer 6

Acts like a highway, helps movement of nutrients around the cell

Question 7

The nucleus does what

Answer 7

Controls the activities of the cell

Question 8

Chromosomes do what?

Answer 8

Carry all the chemical recipes for genes

Question 9

Nucleolus

Answer 9

Involved in the manufacture of chemicals used in the ribosome

Question 10

Vacuoles

Answer 10

Used for storage and transport of chemicals

Question 11

Chloroplasts

Answer 11

Where photosynthesis occurs

Question 12

Cell walls

Answer 12

Gives fixed shale and limits the expansion of the cell membrane

Question 13

Golgi apparatus

Answer 13

Packages and stores chemicals and helps in getting rid of wastes

Question 14

Ribosomes

Answer 14

Where proteins are made

Question 15

Centrioles

Answer 15

Involved in the reproduction of cells

Question 16

Mitochondria

Answer 16

They are the energy releasing organelles, where most of the chemical reactions for respiration occur.

Question 17

Cytoplasm

Answer 17

Jelly like substance, holding all the other organelles in place

Question 18

Lysosome

Answer 18

Contains enzymes that digest particles and disintegrate the cell after its death

Question 19

The difference between smooth and tough er?

Answer 19

Smooth- stores lipids

Rough- stores ribosomes

Question 20

What is an eukaryotic cell??

Answer 20

• Large
• multicellular
• has nucleus and organelles
• dna
• large ribosomes
• mitosis/ meiosis

Question 21

Prokaryotic cells

Answer 21

-small
-unicellular
-no nucleus
-no membrane bound organelles
-ribosomes are small
-

Question 22

The six factors affecting cell transport

Answer 22

1. Surface area and volume ratio
2. Surface area
3. Thickness of membrane
4. Amount of moisture
5. Vascular
6. Concentration gradient.

Question 23

How does the surface area vs volume ratio affect cell transport

Answer 23

In smaller cells= high SA to volume, therefore more cell transport

High SA: more space for materials to move in, but less volume to satisfy

Ex. Large and small cell, the oxygen will diffuse at the same rate but will reach the smaller cells centre quicker

Question 24

How does surface area affect cell transport

Answer 24

High SA: larger amount of materials can be exchanged in a shorter period of time

Question 25

How does thickness of a membrane affect cell transport

Answer 25

Thin tissues / layers of cells means there is less distance molecules have to travel.

Question 26

The amount of moisture affects cell transport how?

Answer 26

All cells are surrounded by a layer of moisture and substances call only diffuse and use cell grad lost when dissolved

Question 27

Being vascular affects cell transport how?

Answer 27

Rich supply of blood vessels- blood is always transporting materials

Question 28

Concentration gradient affects cells transportation how?

Answer 28

Concentration gradient has to be maintained

Ex. Lungs have high O2 concentration rather than blood vessels

Question 29

How do u work out magnification

Answer 29

Ocular magnification x objective magnification