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AQA AS Biology
BIOL2 ­ The variety of living organisms



Common Exam Questions and Answers

DNA

Name the two components that make up the DNA backbone
Deoxyribose
Phosphate

Explain how a DNA mutation can result in a nonfunctioning enzyme
Change in the triplet code
Changes amino acid sequence (primary structure)…

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AQA AS Biology
BIOL2 ­ The variety of living organisms






Compare the structural features of arteries and veins
Structural features Arteries Veins
Valves Absent Present
Relative thickness of walls Thick Thin
Elastic Tissue More Less
Smooth muscle More Less
Lumen Narrow Wide

Explain how smooth muscles in arterioles can reduce…

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AQA AS Biology
BIOL2 ­ The variety of living organisms



The tracheoles lead to each cell where oxygen diffuses into the cell
Ventilation by pumping of the abdomen can replenish the air in the trachea
The body is covered with a water proof waxy cuticle
Spiracles can close when the…

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AQA AS Biology
BIOL2 ­ The variety of living organisms



Immunological evidence
Inject serum containing proteins of species A into an animal
Obtain serum containing antibodies from this animal
Add the serum containing proteins of species B into the serum containing antibodies
The amount of precipitate formed indicates the relationship…

Page 5

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AQA AS Biology
BIOL2 ­ The variety of living organisms



Extend the line (extrapolate)

When viewing tissue cells through an optical microscope why is it important that the
sample is thin?
Need only a single layer of cells
So light can pass through
Detail is not obscured by cells underneath…

Comments

Emma

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These are brilliant,

 Thank You!

Eliza Reid

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These are really useful, thank you so much!

Mariam

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you absolute lifesaver thank you so much

Clare

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These are great, thank you!

Louisa Bourlet

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Thanks!

Saatvik M.Reddy

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this is great!


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