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Science > B1 Biology > Flashcards

B1 Biology Flashcards

1
Q

What are the 3 ways substances can move in and out of cells

A

Diffusion
Osmosis
Active transport

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2
Q

What is diffusion

A

Movement of ANY particle from HIGH to LOW concentration

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3
Q

What can speed up the rate of diffusion and WHY?

A

Temperature because the particles move faster

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4
Q

What is osmosis

A

The movement of WATER
From area of HIGH water concentration to LOW
Across a CELL MEMBRANE

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5
Q

What is active transport

A

Movement of ANY particle from LOW to high (the opposite way)

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6
Q

What do plant cells have that animal cells do not

A

Cell Wall / Chloroplast / Vacuole

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7
Q

What is the function of:

Nucleus -

A

Controls cell / DNA

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8
Q

What is the function of
Mitochondria

A

Release Energy / Respiration

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9
Q

What is the function of

Ribosomes

A

Make Protein

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10
Q

What is the function of

Chloroplasts

A

Contain Chlorophyll /Photosynthesis /
Traps the sunlight

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11
Q

What is the function of
Cell Wall

A

Supports the cell / Made from Cellulose

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12
Q

What is the function of
Cell membrane

A

Control what enters and leaves the cell

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13
Q

What is the function of
Vacuole

A

Store of water / Cell Sap

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14
Q

Give an example of a EUKARYOTIC
cell

A

Animal / Plant cell

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15
Q

Give an example of a
PROKARYOTIC cell

A

Bacteria Cell

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16
Q

What is missing in a prokaryotic cell?

A

A nucleus (they have spaghetti like DNA) or rings of DNA called plasmids

17
Q

What is a plasmid?

A

A ring of DNA found in a bacteria

18
Q

A bacterial cell is 0.003mm long. A magnified image of the cell is 18mm long.
What is the magnification

A

18÷0.003

19
Q

How do we work out mass change

A

End mass - starting mass

20
Q

How do we work out % mass change?

A

Mass change ÷ starting mass x 100

21
Q

Why is to mass change better than just mass change?

A

Because it does not matter what the starting size of the potato is

22
Q

What has happened if the plant cells (e.g. potato) get heavier?

A

Water has moved in by osmosis

23
Q

Osmosis required practical

Equipment -

Dependent V -

Control V -

A

Equipment- Test tube/Balances/Salt Solution
Dependent V- Mass of potato because it does not change
Control V-Type of potato/temperature

Science (2 decks)

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