Pentose Phosphate Pathway, catabolism unless stated

Question 1

when is PPP used

Answer 1

complicated pathway, used at same time as glycolysis or ED. intermediates include 3,4,5,6 and 7 carbon sugars

Question 2

step 1

Answer 2

glucose + ATP –> glucose-6-P +ADP product can enter PPP

Question 3

step 2 glucose-6-P

Answer 3

glucose-6-P is oxidized and NADP+ is reduced. NADPH is used for anabolism

Question 4

step 3 decarboxylation

Answer 4

decarboxylation of an intermediate produces the waste product C02

Question 5

step 4 G3P

Answer 5

G3P is produced, can remain in pathway and be oxidized to produce more NADPH

Question 6

step 5 G3P

Answer 6

alternatively G3P can be used to produced 2 ATP by SL(P), 1 NADH by redox and pyruvate

Question 7

anabolism

Answer 7

in addition to NADPH, PPP produces pentose phosphates, used to synthesize (deoxy)ribose and are precursors for some aa