Cmp,ump,and Tmp All Have ________________ as a Common Precursor
CMP,UMP,and TMP all have ________________ as a common precursor.
Which of the following is not true of the reaction catalyzed by ribonucleotide reductase?
A)Glutathione is part of the path of electron transfer.
B)It acts on nucleoside diphosphates.
C)Its mechanism involves formation of a free radical.
D)There is a separate enzyme for each nucleotide (ADP,CDP,GDP,UDP).
E)Thioredoxin acts as an essential electron carrier.
Which one of the following statements correctly describes the biosynthetic pathway for purine nucleotides?
A)Purine deoxynucleotides are made by the same path as ribonucleotides,followed by reduction of the ribose moiety.
B)The first enzyme in the path is aspartate transcarbamoylase (ATCase).
C)The nitrogen in the purine base that is bonded to ribose in the nucleotide is derived originally from glycine.
D)The pathway occurs only in plants and bacteria,not in animals.
E)The purine rings are first synthesized,then condensed with ribose phosphate.
A cell that is unable to synthesize or obtain tetrahydrofolic acid (H4 folate)would probably be deficient in the biosynthesis of: