<span>Other mutagens act by chemically modifying the bases of DNA. For example, nitrous acid (HNO2) reacts with bases that contain amino groups. Adenine is oxidatively deaminated to hypoxanthine, cytosine to uracil, and guanine to xanthine. ... Uracil pairs with adenine rather than with guanine.</span><span>
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In the nucleus, the part on the cell that contains all the genome
I believe the answer is B.
Reduction
Reduction is the second step of the Calvin cycle which would be affected first by a lack of NADPH.
The Calvin cycle is the group of chemical processes that occur within the chloroplasts during photosynthesis . The three main steps in Calvin cycle are carbon fixation (Carboxylation), reduction, and regeneration of the starting molecule. In the reduction step, NADPH acts as a reducing agent which functions by transferring electrons that allow carbohydrates to be synthesized from carbon dioxide. During these step, there is transfer of two electrons and one proton to the phosphorylated compound by NADPH which produces one phosphate group to form the triose phosphates.
