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GCSE AQA Biology (old spec) > B2.1 Cells, Tissues And Organs > Flashcards

B2.1 Cells, Tissues And Organs Flashcards

(48 cards)

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1
Q

What’s the function of a nucleus?

A

Controls all activities of the cell. Contains genes of the chromosomes

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2
Q

What’s the function of a cell membrane?

A

Controls the passage of substances into and out of the cell.

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3
Q

What are ribosomes?

A

Where protein photosynthesis takes place

In both animal and plant cells

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4
Q

What are mitochondria?

A

Structures in the cytoplasm in both animal and plant cells.

Where oxygen is used and most of the energy is released during respiration

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5
Q

What’s the cell wall?

A

Made of cellulose

Strengthens the cell and gives it support

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6
Q

What are chloroplasts ?

A

Found in all green plants of a plant and they contain chlorophyll
Make food by photosynthesis

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7
Q

What’s the vacuole?

A

Space in the cytoplasm of a plant cell filled with cell sap. Supports the plant

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8
Q

What are three features that are in a plant cell but not an animal cell?

A

Vacuole
Cell wall
Chloroplasts

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9
Q

What’s the equation of aerobic respiration?

A

Glucose + oxygen -> carbon dioxide + water +energy

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10
Q

What’s the equation for anaerobic respiration in plants?

A

Glucose -> ethanol + CO2 + little energy

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11
Q

What are the features in a yeast cell?

A

Nucleus
Cell wall
Cytoplasm

(Same as animal cell but has a cell wall)

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12
Q

What features are there in a bacteria cell?

A 
Cell membrane
Cytoplasm
Genetic material - NO NUCLEUS
Slime capsule
Cell wall
Plasmids
Flagella
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13
Q

Name three types of microorganism

A

Bacteria
Virus
Fungi

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14
Q

How can bacteria be useful?

A

Used in medicine and foods eg. Yoghurt

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15
Q

Why is yeast useful?

A

Used in foods like bread an drinks like alcohol

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16
Q

How does yeast reproduce?

A

Asexually reproduces

Splits into two identical copies

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17
Q

Define plasmids

A

A genetic structure in a cell that can replicate independently of the chromosomes

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18
Q

Define fermentation

A

The chemical breakdown of a substance by bacteria, yeasts or other micro organisms

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19
Q

What is the job of a root hair cell?

A

To collect water and nutrients for a plant to help it

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20
Q

What are the specialised features of a root hair cell?

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A

Long and wavy to collect as many nutrients as possible
Strong base
Thin membrane
Large surface area

21
Q

What are the features and functions of a fat cell?

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A

Features - mitochondria, little cytoplasm, expands 1000x itself
Function - stores energy

22
Q

What are the features and functions of neurones?

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A

Features - long and thin, can carry electrical impulses

Function - carry information from the brain to rest of body

23
Q

What are the features and functions of palisade cells?

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A

Large surface area
Many tightly packed chloroplasts

Where photosynthesis happens to produce food

24
Q

What are the features and functions of red blood cells?

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A

Features - large surface area, small diameter, no nucleus

Functions - to carry oxygen around the body

25
What are the features and functions of sperm cells?
Features - large nucleus, contain digestive enzymes, many mitochondria Functions - carries half the info to fertilise an egg with
26
What are the features and functions of guard cells?
Features - half circle shape, found in pairs, they close when they're full of water Function - they allow oxygen into a plant and let CO2 out
27
What happens in cytoplasm?
Chemical reactions which are controlled by enzymes
28
What is diffusion?
Where a net of particles spreads from a high concentration to a low concentration. This happens in gases or liquids.
29
What happens to diffusion as temperature increases?
Particles move quickly so therefore rate of diffusion increases
30
The greater the difference in __________ the _________ the rate of diffusion. This difference between two areas of concentration is called the concentration ________.
Concentration Faster Gradient
31
Where does diffusion happen in the body?
The lungs - cell membrane is thin and large SA so oxygen can diffuse in and carbon dioxide can diffuse out Small intestine - lots of villi that push the nutrients along the intestine, large SA and thin membrane Placenta - thin membrane so nutrients can diffuse to foetus easily, good blood supply.
32
Where does diffusion take place in the plant?
The leaf - thin cell membrane so oxygen and carbon dioxide can diffuse. Guard cells open and close
33
What's a tissue and give an example.
Group of specialised cells all carrying out the same function Muscular tissue, glandular tissue, mesophyll tissue
34
What's an organ and give an example.
Made up of tissues, several tissues working together | Stomach, kidneys, brain, heart etc.
35
Describe the digestive system.
The food you eat is made up of large insoluble molecules and they need to be broken down. Through your mouth, gullet, diaphragm, stomach, liver, gall bladder, bile duct, pancreas, small and large intestine, appendix and rectum, enzymes break down these large molecules so your body can absorb the useful nutrients.
36
Name the plant organs and their functions
Leaves - collects nutrients and carries out photosynthesis Stem - supports the plant and makes it stand up right Roots - collects water and nutrients from the ground but also supports the plant
37
How are plant cells adapted to diffusion?
The concentration of CO2 is greater outside the cell than inside so co2 diffuses into the cell. Vice versa with oxygen. The cell membrane is thin so the gases can diffuse. The cells are wide with a spongy layer inside to provide a large surface area to collect the gases.
38
How are tissues adapted?
Very thin | Alveoli to make sure the gases sufficiently pass through
39
How are organs adapted?
Large surface area | Extensive capillary network to exchange gases and diffusion can happen quicker
40
Why is diffusion important?
Means gases and substances can flow to all parts of your body and the environment
41
LEARN CROSS SECTION OF A LEAF
LEARN LEARN LEARN GO GO GO !!!!!!!!!!!!!!!!!!!!!!!
42
What's the equation for anaerobic respiration in animal cells?
Glucose -> lactic acid + energy
43
What does a waxy cuticle do?
Reduces water loss
44
What does the epidermis do?
No chloroplasts so allows light to penetrate
45
What do stomata and guard cells do?
Allows carbon dioxide and oxygen out | Controls water loss
46
What does the palisade (mesophyll) do?
Many chloroplasts to trap light | Near top of leaf for receiving more light
47
What does the spongy mesophyll do?
Air spaces for rapid movement of gases
48
What do the phloem and xylem do?
Transport water and nutrients through the plant

GCSE AQA Biology (old spec) (14 decks)

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