BCH 3053 Exam 2
Which enzyme in the pentose phosphate shunt creates both ribose-5-phosphate and xylulose-5-
phosphate? - correct answer ✔✔Transketolase
All of the molecules shown are used in the pentose phosphate pathway phase 2, which of them are
substrates for trans aldolase? - correct answer ✔✔Fructose-6-phosphate, erythrose-4-phosphate,
sedoheptulose-7-phosphate, and glyceraldehyde-3-phosphate
Which enzyme in the pentose-phosphate shunt can generate NADPH? - correct answer ✔✔6-
phosphogluconate dehydrogenase and glucose-6-phosphate dehydrogenase
In the pentose phosphate shunt phase 2, there are two enzymes. Which of the following is an enzyme
from one of these reactions? - correct answer ✔✔Reaction 1: C5 + C5 <-> C7 + C3 (transketolase)
Reaction 2: C3 + C7 <-> C6 + C4 (transaldolase)
Reaction 3: C4 + C5 <-> C6 + C3 (transketolase)
In the pentose phosphate shunt phase 1, there are two strong forward pulling reactions. Which of the
following is an enzyme from one of these reactions? - correct answer ✔✔Glucose-6-phosphate
dehydrogenase and 6-phosphogluconate dehydrogenase
You identify a protein with about 97% carbohydrate. This is best named as a - correct answer
✔✔Proteoglycan
Phase 1 of PPP produces - correct answer ✔✔2 mol NADPH and CO2
Phase 2 of PPP produces - correct answer ✔✔G6P, fructose-6-phosphate, and glyceraldehyde-3-
phosphate
Oxidative damage can be repaired by glutathione. What is needed to restore glutathione? - correct
answer ✔✔NADPH
