Problem :
Where does glycolysis take place in a cell?
In the cytosol.
Problem :
What is the name of the enzyme that catalyzes the phosphorylation of a
glucose molecule in the first step of glycolysis?
Hexokinase.
Problem :
In glycolytic steps one and three, what is the source of the phosphate groups
that are added to glucose and fructose-6-phosphate, respectively?
In both cases the phosphate source is ATP. ATP
molecules have three phosphate groups and after donating one phosphate group
become ADP, a two phosphate containing molecule.
Problem :
What class of metabolic reaction is catalyzed by phosphoglucose isomerase in
the second step of glycolysis? What are the starting and ending molecules in
this step?
An isomerization reaction occurs converting glucose-6-phosphate into
fructose-6-phosphate.
Problem :
In step four of glycolysis, why is dihyroxyacetone phosphate (DHAP) immediately
converted into glyceraldehyde-3-phosphate (GAP) by the enzyme triosphosphate
isomerase?
Of the two aldolase products of step four, DHAP and GAP, only GAP continues
on in the glycolytic pathway. DHAP is converted to GAP so that it can continue
in glycolysis.
