Cells and Organisation Flashcards Preview

Biology GCSE > Cells and Organisation > Flashcards

Flashcards in Cells and Organisation Deck (31):
1

How do you calculate total magnification

Eyepiece lens x objective lens

2

Define the term resolution

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

3

What is the role of the nucleus

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

4

What is the role cytoplasm in a cell

This is where chemcial reactions take place

5

What is the function of the cell membrane

Controls what enters and leaves the cells.

6

What is function of the mitochondria is cells

This is the site of respiration.
Glucose + Oxyen --> Carbon dioxide + water vapour + ATP energy

7

Define the word 'magnification'

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

8

Function of the cellulose cell wall

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

9

Why are ribosomes needed in a cell?

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

10

Converting Units

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

11

What is the function of chloroplasts in plant cells?

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

12

What is the role of the vacuole

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

13

1km = ?m

1000m

14

1m = ?cm

100cm

15

1cm = ?mm

10mm

16

1mm = ?um

1000um

17

1um =?nm

1000nm

18

Diffusion

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

19

Higher concentration gradient --->

Diffusion happens faster

20

Lower concentration gradient --->

Diffusion happens slower

21

Osmosis

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

22

Where does osmosis happen

Across a partially permeable membrane.

23

What type of process is osmosis

It is a passive process

24

What two things are in a dilute solution

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

25

What two things are in a concentrated solution

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

26

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

Lysis

27

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

Crenated

28

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

Turgid

29

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

Plasmolysed

30

Active transport

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

31

Active transport requires:

ATP energy
Carrier proteins in the cell membrane