Intermediate 2 Biology

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Intermediate 2 Biology

• Unit 1 Revision

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Chapter 1 Structure and Function of Cells

• What structures are common to both plant and
  animal cells?
• Name the structures common to all plant cells.
• What is yeast?
• Give 3 commercial uses of yeast.

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Answers

• Cytoplasm, nucleus, cell membrane
• Cell wall, vacuole, (chloroplasts)
• Unicellular (single celled) fungus
• Beer making, bread making, wine making

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Chapter 2 Diffusion and Osmosis

1. What is diffusion?
2. Name two substances that diffuse into a cell.
3. Name a substance that diffuses out of a cell.
4. Describe a plant cell that is plasmolysed.
5. What does turgid mean?

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Answers

1. Movement of a substance from an area of high
   concentration to an area of low concentration
2. Oxygen, glucose
3. Carbon dioxide
4. The vacuole has shrunk and the cytoplasm and cell
   membrane have come away from the cell wall
5. A plant cell that has taken in a lot of water by
   osmosis and is swollen

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Chapter 3 Enzyme Action

1. What is the optimum temperature for all human
   enzymes?
2. What happens to enzymes at temperatures above
   40oC?
3. What other factor affects the activity of
   enzymes?
4. Amylase is an enzyme name its substrate and
   product.
5. Do enzymes get used up during their reactions?

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Answers

1. 37oC
2. Denatured and activity slows down and eventually
   stops
3. pH
4. Substrate starch Product maltose
5. No

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Chapter 4 Respiration

• Write the word equation for respiration.
• What energy conversion takes place during
  respiration?
• What is the name of the first stage of
  respiration?
• Write the equation showing the formation of
  energy.
• Name the substance produced in anaerobic
  respiration in
• a) a plant cell
• b) an animal muscle cell

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Answers

• Glucose Oxygen ? Carbon dioxide water
• Chemical energy in glucose ? chemical in ATP
• Glycolysis
• ADP Pi ? ATP
• a) alcohol
• b) lactic acid

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Chapter 5 Photosynthesis

• What are the raw materials for photosynthesis?
• What other factors must be present for
  photosynthesis?
• Name the product of photosynthesis and state
• a) the storage molecule it is converted into
• b) the structural molecule it is converted into
• What effect does the concentration of carbon
  dioxide have on the rate of photosynthesis?
• What effect does light intensity have on
  photosynthesis?

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Answers

• Carbon dioxide and water
• Light and green pigment chlorophyll
• Product glucose
• a) starch stored in starch grain
• b) cellulose for cell walls
• Rate of photosynthesis increases then levels off
  because another limiting factor is affecting the
  rate
• As above