All Biology Unit 2

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  • Created by: Sunset
  • Created on: 13-01-14 14:16
Why do plants need nitrates?
To make proteins
1 of 20
Name 3 structures that plant cells have and animal cells do not
Vacuole, Cell Wall and Chloroplasts
2 of 20
Describe how you would sample randomly with quadrats
Lay two tape measures at right angles to each other, generate random coordinates from a random number table and place at least 10 quadrats
3 of 20
What is a phenotype?
The characteristic present in an organism
4 of 20
How is a sperm cell specialised to swim to the egg?
Long tail with muscle like proteins, lots of mitochondria for energy, across me with digestive enzymes and nucleus containing DNA
5 of 20
Which type of cell division produces cells that are genetically identical?
Mitosis
6 of 20
Why are trained runners better than untrained runners?
They do less anaerobic respiration as they take more oxygen to muscles because they can pump more blood per beat and training makes more red blood cells to carry oxygen. Produce less lactic acid.
7 of 20
Which enzymes are produced by the stomach?
Pepsin
8 of 20
Name three limiting factors for photosynthesis?
Little light, low temperatures and shortage of oxygen
9 of 20
Name three cells in a plant leaf that photosynthesize.
Guard cells, palisade mesophyll cells and spongy mesophyll cells
10 of 20
What do bacteria cells contain?
Cell membrane and wall (not cellulose), cytoplasm, ribosomes, loops of DNA and plasmids
11 of 20
How can you measure oxygen levels?
Oxygen probe/electrode
12 of 20
Describe three different places where mummification can occur and why it occurs there.
Amber or tar pits have no oxygen/moisture, peat bogs are too acidic and glaciers are too cold (for microbes to decay)
13 of 20
Describe the process of speciation
Geographic separation, genetic variation due to mutations, something different so natural selection takes place and genetic differences mean they are unable to interbreed and have fertile offspring
14 of 20
What is the use of magnesium in plants?
Am. Chlorophyll
15 of 20
Why is bile addede to stomach juices?
Neutralise them and provide optimum pH for small intestine, emulsify fats to speed up fat digestion
16 of 20
Why do you use at least 10 quadrats for random sampling?
Improves validity
17 of 20
Why does breathing rate increase during exercise?
Moe respiration to release more energy for muscle contraction so need more oxygen
18 of 20
Describe the structure of yeast cells?
Nucleus, cytoplasm, mitochondria, vacuole, cell membrane and cell wall. 10x bigger than bacteria cells
19 of 20
Why don't heart rate and breathing rate immediately return to normal after exercise
Need to breathe out extra CO2 and pay back oxygen debt (turn lactic acid into CO2 and water
20 of 20

Other cards in this set

Card 2

Front

Name 3 structures that plant cells have and animal cells do not

Back

Vacuole, Cell Wall and Chloroplasts

Card 3

Front

Describe how you would sample randomly with quadrats

Back

Preview of the front of card 3

Card 4

Front

What is a phenotype?

Back

Preview of the front of card 4

Card 5

Front

How is a sperm cell specialised to swim to the egg?

Back

Preview of the front of card 5
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