| 21. | It can salvage adenine from the polyamine biosynthetic pathway or from dietary sources of purines.
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| 22. | Homoserine dehydrogenase is an enzyme involved in the biosynthetic pathway of several key amino acids.
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| 23. | It is closely related in chemical structure to atropine, hyoscyamine, and biosynthetic pathway.
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| 24. | The particular biosynthetic pathway varies across eukaryotes.
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| 25. | The cyclization of the fatty acids is similar to the biosynthetic pathway cyclization of prostaglandins.
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| 26. | RNA is thought to have preceded DNA, because of their ordering in the biosynthetic pathways.
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| 27. | They also play important roles in biosynthetic pathways, including extracellular polysaccharide biosynthesis and cytochrome biogenesis.
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| 28. | Oxaloacetate produced by PC is an important intermediate, which is used in these biosynthetic pathways.
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| 29. | The encoded protein stimulates squalene monooxygenase which is a downstream enzyme in the cholesterol biosynthetic pathway.
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| 30. | The biosynthetic pathway of nicotine involves a coupling reaction between the two cyclic structures that compose nicotine.
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