Exam Questions on unit 2 (snab)

Exam style questions on some of the key points in unit 2

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  • Created on: 06-06-10 11:42
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1. Identify these two organelles from their descriptions and state their functions:
a. An oval shaped organelle surrounded by a double membrane. The inner membrane is
folded and projects into the inner space, which is filled with grainy material
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b. A collection of flattened membrane sacs arranged roughly parallel to each other,
getting smaller. Small, circular structures are seen at the edges of these sacs, for
transportation.
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2. Describe how to prepare a root tip to observe mitosis
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Page 2

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Explain what crossing over is and how it leads to genetic variation
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b. Explain how independent assortment leads to genetic variation
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4.
a. Describe the fertilisation process in mammals, starting with the acrosome reaction
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Page 3

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In what type of plants does double fertilisation occur?
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5.
a. Define totipotent
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b. Define pluripotent
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c. Describe how differential gene expression results in the production of specialised
cells
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6.
a. Describe the term niche.
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Page 4

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Explain how natural selection can lead to adaptations becoming more common in
populations
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7. Compare the structure and function of Xylem vessels and Sclerenchyma fibres
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Page 5

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Describe an experiment you could carry out to investigate the effects of nitrate deficiency
on a plant.
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9.
a. Describe how William Withering discovered and tested the drug digitalis
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Page 6

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A new drug made from a plant extract would have to go trough clinical trials before
it's made available to patients. Describe the process.
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