B1: Cells And Organisation Flashcards

1
Q

What is diffusion?

A

When particles move from an area of high concentration to an area of low concentration

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2
Q

What are examples of diffusion in everyday life?

A

When water is mixed with juice
When a lynx can is sprayed

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3
Q

Is energy needed for diffusion to happen?

A

No because it is a passive process

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4
Q

What is a concentration gradient?

A

The difference in concentration between two areas

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5
Q

What happens to the rate of diffusion if the concentration gradient is steeper?

A

The rate of diffusion is faster

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6
Q

What is Osmosis?

A

The movement of particles from a dilute solution (high concentration of water) to a more concentrated solution (less concentration of water) across a partially permeable membrane

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7
Q

What are partially permable membranes?

A

Membranes that only let certain molecules through

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8
Q

Why is osmosis important in plants?

A

Plants rely on the movement of water to survive

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9
Q

If a cell is turgid what does it mean?

A

The cell is very strong and not flimsy

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10
Q

If a cell is flaccid what does that mean?

A

It is flimsy and not very firm

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11
Q

What is active transport?

A

When particles move up (or against) a concentration gradient using energy

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12
Q

Is energy needed for active transport?

A

Yes

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13
Q

In active transport do the particles go from high to low concentration or low to high concentration?

A

Low to high concentration

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14
Q

When particles are using active transport to enter a cell, what must they pass through using active transport?

A

The cell membrane

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15
Q

How do you figure out the real size of something in a magnified image?

A

You work out the image size after magnification using a ruler

You then divide the image size by the magnification

e.g
Image size = 10
Magnification = 50

10/50 = 0.2mm

0.2mm = real size

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16
Q

What features do plant cells have that animal cells do not?

A

Cell Wall
Chloroplasts
Permanent Vacuole

17
Q

What does the cell membrane do?

A

Controls which substances pass in and out of the cell

18
Q

What does the nucleus do?

A

Contains genetic material (DNA)

19
Q

What does the cytoplasm do?

A

It is where chemical reactions take place

20
Q

What does the mitrochondria do?

A

Provide cells with the energy they need to function

21
Q

What does the ribosome do?

A

It is the site of protein synthesis

22
Q

What does the cell wall do?

A

Supports and structures the cell

23
Q

What does the chloroplast do?

A

It is where photosynthesis takes place

24
Q

What does the permanent vacuole do?

A

Contains sell sap (mixture of sugars, salts and water) to help keep the cell turgid

25
Q

What is 1 thing in a prokaryotic cell that is not in a eukaryotic cell?

A

Plasmids