Biology Unit 2

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What is the microscopy equation?
Image = Actual x Magnification
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what is the importance of muscle fibres in the arteriole wall?
muscle contracts; constricts so it regulates blood flow
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Why does rate of blood flow cause efficient gas exchange?
more time for exchange of substance
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When are gene mutations most likely to occur? Why?
Interphase; because DNA replication occurs
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How do new alleles combinations arise in gametes?
crossing over; exchange of alleles between chromatids
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What is the relationship between heat from respiration and surface area:volume of mammals?
Smaller mammal has greater surface area to volume ratio; Smaller mammal/larger SA:Vol ratio more heat lost (per unit body mass); Smaller mammal/larger SA:Vol ratio has greater rate of respiration/metabolism; Oxygen required for respiration
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How is genetic diversity decreased in a population?
reduced variety of alleles; Founder effect; few individuals from a population become isolated; (Genetic) bottlenecks;fall in size of population; Selective breeding
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How is tissue fluid delivered to tissue and back to the circulatory system?
hydrostatic pressure higher in the arteriole end; Water forced from blood to the tissue; water potential of blood reduced due to proteins so water returns to capillary at venous end when hydro pressure is lower; excess returns in lymph vessel
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Why is diversity index more useful than other measures?
Measures number of species and individuals; some species are present in smaller numbers so may be discounted
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Why was the shoot cut under water? (potometer)
Prevent air entering; maintaining vertical column
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What measurements need to be made? (potometer)
Distance and time; Radius of capillary tube
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Why is rate of transpiration not always equal to water uptake in the potometer?
water provides turgidity; used in photosynthesis; apparatus may not be sealed
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How does the reservoir allow repeat readings to be made?
Returns bubble (to start)
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What is the advantage of repeat readings?
Increases reliability (of results) / anomalous result can be identified;
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Other cards in this set

Card 2

Front

what is the importance of muscle fibres in the arteriole wall?

Back

muscle contracts; constricts so it regulates blood flow

Card 3

Front

Why does rate of blood flow cause efficient gas exchange?

Back

Preview of the front of card 3

Card 4

Front

When are gene mutations most likely to occur? Why?

Back

Preview of the front of card 4

Card 5

Front

How do new alleles combinations arise in gametes?

Back

Preview of the front of card 5
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