Based Upon the Comparisons of Anoxygenic and Oxygenic Photosythesis, the Entry

question 9

Multiple Choice

Based upon the comparisons of anoxygenic and oxygenic photosythesis, the entry of oxygen into the atmosphere is most directly attributed to

• A)photoreactivation.
• B)photosystem I.
• C)photosystem II.
• D)bacteriorhodopsin.
• E)the Calvin cycle.