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Biology > B1 Cells And Organisation X Microscope > Flashcards

B1 Cells And Organisation X Microscope Flashcards

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1
Q

What is diffusion?

A

The movement of particles from high concentration to low conventration

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2
Q

What is the difference in concentration called?

A

Concentration gradiant (the bigger the concentration gradient the faster the diffusion rate)

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3
Q

Where does diffusion happen?

A

In solutions and gasses

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4
Q

What part of the cell lets stuff diffuse in and out of the cell

A

Cell membrane

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5
Q

What temperature creates a higher diffusion rate

A

Hotter

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6
Q

What is osmosis?

A

The movement of liquid from a high concentration to a low concentration

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7
Q

What does low and high concentration mean in liquid?

A

Low= more particles
High= less particles

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8
Q

Why does osmosis happen?

A

Because the liquid is trying to even up

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9
Q

What are the two things cells can be?

A

Prokaryotic and eukaryotic

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10
Q

Define the word tissue

A

Collection of cells of similar structure and function allworking together

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11
Q

Define the word organ

A

Collection of diffrent tissues working together to carry out a specific functiom

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12
Q

What does the digestion system do?

A

Digestion is the process where the large molecules into small molecules so they can be absorbed into the blood

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13
Q

What is active transport?

A

The movement of molecules across a cell membrane from a region of lower concentration to high concentration against a gradiant

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14
Q

How do you calculate magnification

A

Magnification=eyepiece lens x objective lens

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15
Q

What is resolution

A

The ability to distinguish between two seperate points in an image

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16
Q

What is the function of the nucleus

A

Contains DNA in the form of chromosones, contains the genetic code.

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17
Q

What is the function of the cytoplasm

A

Where chemical reactions take place

18
Q

What is the function of the cell membrane

A

Controls what comes in and out of the cell

19
Q

What is the function of mitochondria

A

This is where respiration takes place

20
Q

What is the function of the cellulose cell wall

A

The outside layer of plant cells and gives the plant strength and support

21
Q

What is the function of ribosomes

A

The location where proteins are made

22
Q

What is the function of chloropasts

A

Contains a chemical called chlorophyll. It traps sunlight energy which is needed for photosynthesis

23
Q

What happens to an animal cell when placed in a more dilute solution

A

The cell gains water through osmosis and it may burst

24
Q

What happens to an animal cell when placed in a more concentrated solution

A

The cell loses water and may shrivel

25
Q

What happens to a plant cell when placed in a more dilute solution

A

Gains water through osmosis however doesnt burst

26
Q

Why does a plant cell not burst when placed in a more dilute solution

A

The plant cell has a cell wall

27
Q

What happens to a plant cell when placed in a more concentrated solution

A

Loses water by osmosis and the cell membrane pulls away from the cell wall

28
Q

What types of cells dont have a nucleus

A

Prokaryotic cells

29
Q

What is the function of sperm cells

A

They fertilise the egg cell during sexual reproduction

30
Q

What is the function of nerve cells

A

Transmits electrical pulses around the body

31
Q

What is the function of muscle cells

A

Are specialised to contract quickly to move bones

32
Q

What is the function of root hair cells in plants

A

Specialised to absorb water by osmosis and mineral ions by active transport

33
Q

How do you calculate mm to nm

A

X1000

34
Q

Convert 20mm to nm

A

20mm x 1000=20,000nm

35
Q

What are the 8 main parts of the light microscope

A

Eyepiece lens, body tube, high and low power objective lenses, stage, mirror, rough focusing knob, fine focusing knob, handle.

36
Q

What is an organism

A

A living thing made up of cells

37
Q

What are 4 things animal and plant cells both have

A

Nucleus, cytoplasm, cell membrane, mitochondria

38
Q

What are three things plant cells have than animal cells dont

A

Cell wall, vacuole, chloropasts.

39
Q

What are multi cellular organisms

A

Made up of lots of cells

40
Q

What are unicellular organisms

A

Organisms made up of only one cell

Biology (11 decks)

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