MCAT GLYCOLYSIS QUESTIONS WITH
ANSWERS.
Glycolysis is the first step in cellular respiration, where sugars that are consumed are
converted into fuels. It is when glucose is converted into ...... molecules of................... -
Answers-2
pyruvate
Here is a pic of the steps of glycolysis - Answers-
List the enzymes that catalyze each step of glycolysis in order: - Answers-1. hexokinase
2. phosphoglucose isomerase
3. phosphofructokinase-1
4. aldolase
5. trios phosphate isomerase
6. glyceraldehyde 3-phosphate dehydrogenase
7. phosphoglycerate kinase
8. phosphoglycerate mutase
9. enolase
10. pyruvate kinase
Which steps of glycolysis are irreversible? - Answers-step 1: glucose -> glucose 6-P
step 3: fructose 6-P -> fructose 1,6-bis P.
step 10: phosphoenolpyruvate -> pyruvate
Which enzymes catalyze the irreversible steps? - Answers-- hexokinase (or glucokinase
in the liver and some pancreatic cells)
- Phosphofructokinase-1
- pyruvate kinase
When glucose is taken up by its target cells, we want to make sure it isn't taken up by
receptors and removed from the cell. Thats why hexokinase (or glucokinase)
phosphorylates glucose, making it into................... and trapping it in the cell. - Answers-
glucose 6-P
What is the most common biological role for a kinase? - Answers-Adds a phosphate
group
Hexokinase is most active when glucose is................ and glucokinase is most active
when glucose is................. - Answers-scarse
abundant
Hexokinase and glucokinase are regulated differently. How is hexokinase regulated? -
Answers-By negative feedback. It is inhibited by glucose 6-P
ANSWERS.
Glycolysis is the first step in cellular respiration, where sugars that are consumed are
converted into fuels. It is when glucose is converted into ...... molecules of................... -
Answers-2
pyruvate
Here is a pic of the steps of glycolysis - Answers-
List the enzymes that catalyze each step of glycolysis in order: - Answers-1. hexokinase
2. phosphoglucose isomerase
3. phosphofructokinase-1
4. aldolase
5. trios phosphate isomerase
6. glyceraldehyde 3-phosphate dehydrogenase
7. phosphoglycerate kinase
8. phosphoglycerate mutase
9. enolase
10. pyruvate kinase
Which steps of glycolysis are irreversible? - Answers-step 1: glucose -> glucose 6-P
step 3: fructose 6-P -> fructose 1,6-bis P.
step 10: phosphoenolpyruvate -> pyruvate
Which enzymes catalyze the irreversible steps? - Answers-- hexokinase (or glucokinase
in the liver and some pancreatic cells)
- Phosphofructokinase-1
- pyruvate kinase
When glucose is taken up by its target cells, we want to make sure it isn't taken up by
receptors and removed from the cell. Thats why hexokinase (or glucokinase)
phosphorylates glucose, making it into................... and trapping it in the cell. - Answers-
glucose 6-P
What is the most common biological role for a kinase? - Answers-Adds a phosphate
group
Hexokinase is most active when glucose is................ and glucokinase is most active
when glucose is................. - Answers-scarse
abundant
Hexokinase and glucokinase are regulated differently. How is hexokinase regulated? -
Answers-By negative feedback. It is inhibited by glucose 6-P
