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    Life on Earth - 8 Short Questions.

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    Life on Earth - Biological Concepts from the Non-Science Major Perspective

    Quiz: (1 point each)

    1. Describe the difference between and exergonic and endergonic reaction?

    2. Why do environmentalists claim that an increase in forests, i.e. rainforests, will slow down the effects of global warming?

    3. Explain how fats and proteins may be utilized as fuels in the cells?

    4. Describe the function of a catalyst in a biochemical reaction.

    5. List 4 factors that influence the rate of photosynthesis.

    6. How does the structure of the mitochondria relate to its function?

    7. As a biker pumps up a hill to the finish line his leg muscles begin to feel fatigue. Describe the processes at work to make him feel this way.

    8. How does aerobic respiration differ from anaerobic metabolism in terms of the reactants and the products?

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    Solution Preview

    Hi I've written the questions out again. I've added quite a lot of explanation. You'll need far less than this to get your one mark!

    1. Describe the difference between exergonic and endergonic reactions:

    The key to this one is the latin! gonic means energy and exer means gives out whilst endermeans takes in. Therefore an exergonic reaction releases energy whilst an endogonic one requires energy to be added. You may well have drawn graphs showing this.

    2. Why do environmentalists claim that an increase in forests, i.e. rainforests, will slow down the effects of global warming?

    Global warming is caused by the release of greenhouse gases. These trap the sun's heat warming the earth (just like a greenhouse). A major greenhouse gas is carbon dioxide- from burning fossil fuels. Plants use carbon dioxide in photosynthesis, so planting forests will reduce the quantity of carbon dioxide in the atmosphere and therefore decrease the warming of the earth.

    3. Explain how fats and proteins may be utilised as fuels in the cell.

    OK - I could give a huge and detailed answer to this, but for 1 point I'm guessing you want something not too complicated. Fats undergo glycolysis and enter the Krebs cycle. I don't know how much detail you've gone into but the advantage of using fats for respiration is that they release a large number of hydrogen ions. These can be used to produce ATP, and so fats produce more than double the energy of the same quantity of carbohydrate.

    Proteins are only used in cases of starvation. The amino ...