Students are presented with two different diagrams showing the use of gases in
cellular respiration and photosynthesis and asked to explain which is correct.
1
• Student A says model A is correct because oxygen is a product of
photosynthesis and a reactant for cellular respiration
Student B says model B is correct because carbon dioxide is a product of
photosynthesis and a reactant for cellular respiration
Which student is correct and how could the model be improved?
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Ответ:
(d) None of the above
Explanation:
The pH of your stomach must be highly acidic, because the optimum pH for pepsin, the chief stomach enzyme, is 1.5.
(a) and (b) are wrong, because both conditions are basic.
(c) is wrong, because pH 7 is neutral.