Chapter 19 Reading Question 9 Part A Arrange the first 5 steps of the de novo bi

Question

Chapter 19 Reading Question 9

Part A

Arrange the first 5 steps of the de novo biosynthesis of cytosine triphosphate in their correct order:

1) cyclization to dihydroorotate
2) transfer of a carbamoyl group
3) conversion of bicarbonate to carbamoyl phosphate
4) nucleotide synthesis catalyzed by phosphoribosyltransferase
5) dehydrogenation to yield a conjugated enone system

Arrange the first 5 steps of the de novo biosynthesis of cytosine triphosphate in their correct order:

1) cyclization to dihydroorotate
2) transfer of a carbamoyl group
3) conversion of bicarbonate to carbamoyl phosphate
4) nucleotide synthesis catalyzed by phosphoribosyltransferase
5) dehydrogenation to yield a conjugated enone system

Explanation / Answer

The answer is
3-2-1-5-4

3) conversion of bicarbonate to carbamoyl phosphate

2) transfer of a carbamoyl group

1) cyclization to dihydroorotate

5) dehydrogenation to yield a conjugated enone system

4) nucleotide synthesis catalyzed by phosphoribosyltransferase

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