Biology Paper 2 Revision Mix

Name The 3 Enzymes Involved in the Hydrolysis of Proteins
1) Endopeptidasdes 2) Exopeptidases 3) Dipeptidases
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Why are the combined actions of Endo- & Exo- peptidases more efficient? (Than just exopeptidases)
Endopeptidases hydrolyse internal peptide bonds, allowing an increase in Surface Area for the end-breaking Exopeptidases.
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Explain Why The Addition of a Respiratory Inhibitor stops absorption of amino acids.
There is no ATP produced, so the sodium ions do not move ; therefore there is no diffusion gradient for the sodium.
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What do xerophytic external hairs do?
Trap water vapour.
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What does a waxy cuticle do (xerophytically)?
Reduces evapouration from the plant.
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Why might the rate of water uptake in the plant be different from the transpiration rate?
Any of these 4 reasons : 1) Water is used for supporting the plant's stability 2) The water may be used in photosynthesis to create Oxygen & Glucose 3) The water may be used in the hydrolysis of chemicals 4) It is created in respiration
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Why is the body of a worm efficient for gas exchange?
It is thin, so there is a short diffusion pathway. It is flat & long, giving a large Surface Area to Volume Ratio.
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Why would a freshwater creature die in saltwater?
Saltwater has a much higher water potential than freshwater, so water would leave the worm & it would die from lack of oxygen & dehydration.
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Why would the removal of hedges result in a decrease in the diversity of species?
There would be fewer food sources & habitats, so competition would increase & only the strongest would survive.
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What comes first 1 or 4?
The 1 is always last. (4 : 1)
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Why might a seed respond to seasonal changes?
The seeds will remain inactive in winter (dependent on seed), will develop in the spring, then photosynthesis when warmest, because that is also when the most sunlight comes down.
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Why could a mutation of the CCR5 gene result in a non functional protein receptor?
The mutation causes a change in the DNA base, which changes the primary structure of the proteins, alters the position of the protein bonds & causes a change in the tertiary structure.
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Why would people with the mutation of CCR5 have a greater resistance to developing AIDS.
Because the receptor is not complimentary to the virus, so there is no replication.
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Sugar Transport in Plant Stems. Name the stages.
1. (At source) sucrose is actively (transported) into the phloem/sieve element/tube; 2. By companion/transfer cells; 3. Lowers water potential in phloem/sieve element/tube and water enters by osmosis; 4. (Produces) high (hydrostatic) pressure; 5. Mas
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Other cards in this set

Card 2

Front

Why are the combined actions of Endo- & Exo- peptidases more efficient? (Than just exopeptidases)

Back

Endopeptidases hydrolyse internal peptide bonds, allowing an increase in Surface Area for the end-breaking Exopeptidases.

Card 3

Front

Explain Why The Addition of a Respiratory Inhibitor stops absorption of amino acids.

Back

Preview of the front of card 3

Card 4

Front

What do xerophytic external hairs do?

Back

Preview of the front of card 4

Card 5

Front

What does a waxy cuticle do (xerophytically)?

Back

Preview of the front of card 5
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