Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

GCSE Bioligy > B1 - Cells And Organisation > Flashcards

B1 - Cells And Organisation Flashcards

You may prefer our related Brainscape-certified flashcards:
GCSE Religious Studies - Edexcel Route A flashcards GCSE Religious Studies - Eduqas Route A flashcards GCSE Geography - AQA flashcards GCSE Religious Studies - Edexcel Route B flashcards GCSE Religious Studies - Eduqas Route B flashcards
1
Q

Can a solid diffuse?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Can a liquid diffuse?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Can a gas diffuse?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Whats the definition of diffusion?

A

The net movements of particles from an area of high concentration to an area of low concentration. Due to the random movement of particles. A passive process which means that no energy is needed.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Whats a difference in concentration between two areas?

A

Concentration gradient

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

List some factors that affect diffusion

A

Concentration gradient
Temperature
Large surface area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

There is faster diffusion when there is…

A

Large concentration gradient
Higher temperature
Larger surface area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Surface Area to Volume Ratio means that…

A

The surface area to volume ratio falls as the object gets bigger.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does dilute mean?

A

Weak

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What does concentrated mean?

A

Strong

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Definition of osmosis:

A

Osmosis is the movement of water molecules from a region of higher water concentration to a region of lower water concentration across a partially permeable membrane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Definition of isotonic:

A

If the concentration of the solutes in the solution outside the cell is the same as the internal concentration, the solution is isotonic to the cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Definition of hypertonic

A

If the concentration of the solutes in the solution outside the cell is higher than the internal concentration, the solution is hyertonic to the cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Definition of hypotonic

A

If the concentration of solutes in the solution oustside the cell is lower than the internal concentration, the solution is hypotonic to the cell.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is the function of the cell membrane?

A

Controls what enters and leaves the cell

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are eukaryotes?

A

They are cells that are complex and include all animal and plant cells

17
Q

What are Prokaryotic cells?

A

Prokaryotic cells are single-celled organisms and are much smaller and simpler ( e.g. bacteria)

18
Q

What are plasmids?

A

Small rings of DNA

19
Q

What is the function of a ribosome?

A

It is where all the protiens are made in the cell and it is the place where protein synthesis happens

20
Q

What is the function of the mitochondria?

A

It is the site of aerobic respiration ( release of energy from food )

21
Q

What is the function of a cytoplasm?

A

It is the place where chemical reactions take place in the cell

22
Q

What is the function of the nucleus?

A
  • controls the cell
  • contains the genetic information called DNA
23
Q

What is the function of the cellulose and the cell wall?

A

The cell wall is made of cellulose and it supports the cell and strengthens it

24
Q

What is the formula for magnification?

A

Magnification x real size

25
Q

How do you prepare a slide for the microscopy practical?

A

1) add a drop of water to the middle of a clean slide
2) cut up an onion and use tweezers to peel of some tissue and put it into the water of the slide
3) Add a drop of iodine solution
4) Place a cover slip on top of the iodine and onion and try to not get any airbubbles

26
Q

How do you use the light microscope in the microscopy practical?

A

1) clip in the prepared slide onto the stage
2) select the lowest power objective lens first
3) look down the eyepiece lens
4) Turn the coarse adjustment knob to move the stage upwards and get the slide roughly in focus
5) Turn the fine adjustment knob to get a clear image of whats on the slide
6) Select the medium power objective lens and repeat steps 3 and 4

27
Q

How do you calculate percentage change?

A

Percentage change = final value - original value x100
Original value

28
Q

How do you do the osmosis practical?

A

1) You cut up a potatoe into identical cylinders and get some beakers with different sugar solutions in them ( 1 should be with water and another with a very concentrated sugar solution )

2) You measure the mass of the cylinders and then leave one cylinder in each beaker for 24h

3) Later, you take them out and dry them with a paper towel and measure their masses again

4) If the cylinders have drawn in water by osmosis, they’ll have increased in mass. If the water has been drawn out then they will have decreased in mass.

29
Q

What are root hair cells specialised to do?

A

They are specialised to have a higher surface area therefore water and minerals could be absorbed easyer

30
Q

What is active transport?

A

Active transport is the movement of dissolved molecules into or out of a cell through the cell membrane, from a region of lower concentration to a region of higher concentration. The molecules move against the concentration gradient , using energy released during respiration.

31
Q

What do you do to get from mm to um to nm

A

mm x1000 um x1000 nm

32
Q

What is the function of a Vacuole?

A

Stores cell sap

33
Q

What do chloroplasts do?

A

They contain chlorophyll which absorbs light needed for photosynthesis and is the place where photosynthesis happens which makes food for the plant.

GCSE Bioligy (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions