How many molecules of adenosine triphosphate has the cell invested by the end of the fifth step of glycolysis?
AOne molecule
BTwo molecules
CThree molecules
DFour molecules
Answer & Solution
Correct answer: B. Two molecules
1. Step one spends one adenosine triphosphate when hexokinase phosphorylates glucose.
2. Step three spends a second one when phosphofructokinase adds another phosphate.
3. At the end of the fifth step there is a net investment of energy from two such molecules per glucose.
4. No further investment is needed, because the sixth step adds its phosphate without spending any.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.2 Glycolysis_
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