18. Which one of the following factors should be on the x-axis of the graph to accurately describe enzyme reaction rate? а. pH b. temperature c. enzyme concentration d. substrate concentration CH, 19....

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Extracted text: 18. Which one of the following factors should be on the x-axis of the graph to accurately describe enzyme reaction rate? а. pH b. temperature c. enzyme concentration d. substrate concentration CH, 19. The structure shown to the right is a (nucleic acid / nucleotide NH neither). It contains (ribose / deoxyribose / neither), and the nitrogenous base is a (purine / pyrimidine / neither). -o-CH2 ÓH 20. Write the nucleotide sequence of the RNA formed from a segment of DNA, if the DNA template strand is: 5'- A CTGGA-3'. Be sure to indicate which is the 5' end and which is the 3' end 21. Pyruvate can be converted into three possible products depending on the conditions and the organism. Describe two of these products along with the conditions that lead to their formation. Reaction Rate