Question - Answer each of the following questions in 100 words max. t is important that you answer the questions in your own words; if it is necessary to quote from another source, please do so sparingly and provide the citation.
1) How is the reciprocal use of nucleotides useful in purine synthesis?
2) Which vitamin supplement is taken during the first trimester of pregnancy to prevent the birth defect known as spina bifida?
3) How is a chloroplast similar to mitochondria in regard to energy production?
4) Why are reactions of the Calvin cycle called the "dark reactions"?