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spin [16.1K]
3 years ago
11

You are asked to test the biochemical oxygen demand (BOD) of a stream in your town. After observing the BOD over a week, you cal

culate that the water has a BOD of 150 mg of oxygen, which is a relatively high level. This leads you to conclude that: ______
a. the water has a high level of oxygen.
b. the water is likely contaminated with high levels of pollution or waste.
c. the water quality is safe for most aquatic organisms.
d. the high level of oxygen demand is likely caused by natural decomposition
e. the water is safe for drinking.
Biology
1 answer:
Lemur [1.5K]3 years ago
6 0
B. The water is likely contaminated with high levels of pollution or waste
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If acetyl-CoA is labeled with 14C at its methyl group, how many rounds of the cycle are required before 14CO2 is released?
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14 CO₂ will be released in the second turn of the cycle

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<u>Complete question goes like this</u>, "<em>The CO2 produced in one round of the citric acid cycle does not originate in the acetyl carbons that entered that round. If acetyl-CoA is labeled with 14C at the carbonyl carbon, how many rounds of the cycle are required before 14CO2 is released?</em>"

<u>The answer to this is</u>;

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  • Succinate converts into fumarate. Fumarate converts into malate, and malate converts into oxaloacetate. Because succinate is symmetrical, the oxaloacetate can have the label at C1 or C4.
  • When these condense with acetyl-CoA to begin the second round of the cycle, both of these carbons are discharged as CO2 during the isocitrate dehydrogenase and alpha-ketoglutarate dehydrogenase reactions (formation of alpha-ketoglutarate and succinyl-CoA respectively).

Hence, 14 CO₂ will be released in the second turn of the cycle.

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Answer:

??

Explanation:

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