WorksheetsNon-Oxidative Phase of the Pentose Phosphate Pathway
Total questions: 14
Worksheet time: 7mins
What is the first step in process one of the non-oxidative phase?
Change ribulose 5-phosphate into glucose 6-phosphate
Convert ribulose 5-phosphate into xylose 5-phosphate
Transform ribose 5-phosphate into ribulose 5-phosphate
Isomerize ribose 5-phosphate into glucose 5-phosphate
Which enzyme catalyzes the transformation of ribose 5-phosphate into ribulose 5-phosphate?
Phosphopentose isomerase
Phosphopentose epimerase
Transaldolase
Transketolase
What is the stereochemical difference between ribulose 5-phosphate and xylose 5-phosphate?
They differ at the second carbon
They differ at the first carbon
They differ at the fourth carbon
They differ at the third carbon
What is produced in process two of the non-oxidative phase?
Ribulose 5-phosphate and xylose 5-phosphate
Fructose 6-phosphate and glyceraldehyde 3-phosphate
Ribose 5-phosphate and glucose 6-phosphate
Xylose 5-phosphate and ribulose 5-phosphate
What cofactor is required by transketolase in process two?
FADH2
ATP
NADPH
Thiamine pyrophosphate
What type of sugar is formed when a two-carbon group is transferred to ribose 5-phosphate?
Pentose
Hexose
Heptulose
Tetrose
What is the final product of process three?
Xylose 5-phosphate
Glyceraldehyde 3-phosphate
Fructose 6-phosphate
Ribulose 5-phosphate
Which enzyme is used in both process three and process four?
Phosphopentose epimerase
Transaldolase
Transketolase
Phosphopentose isomerase
What is the net input of ribose 5-phosphate molecules in the non-oxidative phase?
Two
Four
Three
Five
What is the role of glyceraldehyde 3-phosphate in the pathway?
It is an enzyme in the pathway
It is converted into glucose 6-phosphate
It is a precursor for ribose 5-phosphate
It is a glycolytic intermediate
How many xylose 5-phosphate molecules are produced in process one?
One
Two
Three
Four
What happens to ribose 5-phosphate when the cell needs more NADPH?
It is stored as glycogen
It enters the non-oxidative phase
It undergoes the oxidative phase
It is converted to glucose
What is the significance of the non-oxidative phase of the pentose phosphate pathway?
It generates ATP
It produces NADH
It links glycolysis and ribose metabolism
It synthesizes fatty acids
What type of sugar is citoheptulose 7-phosphate?
Pentose
Heptose
Triose
Hexose
