Why Isn't Oxygen Produced by Organisms That Perform Anoxygenic Photosynthesis

question 77

Multiple Choice

Why isn't oxygen produced by organisms that perform anoxygenic photosynthesis?

• A)their photosystems do not utilize the Calvin cycle
• B)they use a different enzyme for the initial reactions of the Calvin cycle ​
• C)they use electron donors other than water ​
• D)their membranes lack ATP synthase ​
• E)their chlorophyll contains an iron center rather than magnesium ​

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Proportional Tax

A tax system where the tax rate remains constant regardless of the amount subject to tax, meaning everyone pays the same proportion of their income.

Regressive Tax

A tax imposed in such a manner that the tax rate decreases as the amount subject to taxation increases, disproportionately affecting lower-income individuals.

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