Download Cellular Respiration Check-in Questions: THESE Questions are

Cellular Respiration Check-in Questions: THESE Questions are NOT meant to be an
exhaustive list of questions from this topic! These questions are meant for us to
practice on how to approach assessments for this course!
1. What would happen to the ATP production when a person is fasting or a lowcarbohydrate diet? Why?
2. Which statement(s) accurately describes the function of a metabolic
pathway?
a. The function of the citric acid cycle is oxidation of an acetyl group to
CO2 with production of high-energy reduced compounds and ATP.
b. The function of fermentation is to continue the oxidation of pyruvate
in the absence of oxygen.
c. The function of glycolysis is to begin catabolism by breaking glucose
into two molecules of pyruvate, with a net yield of two ATP.
3. In one or two sentences, describe the essential role(s) of each of the
following processes involved in energy transformations in cells. Include in
your answer the major products of each process.
a. Citric acid cycle
b. Fermentation
c. Respiratory electron transport chain
4. Drugs known as uncouplers facilitate diffusion of protons across the
membrane. When such a drug is added, what will happen to ATP synthesis
and oxygen consumption, if the rates of glycolysis and the citric acid cycle
stay the same?
a. Both ATP synthesis and oxygen consumption will decrease.
b. ATP synthesis will decrease; oxygen consumption will increase.
c. ATP synthesis will increase; oxygen consumption will decrease.
d. Both ATP synthesis and oxygen consumption will increase.
e. ATP synthesis will decrease; oxygen consumption will stay the same.
5. If the main purpose of cellular respiration is to produce ATP, why do
glycolysis and the Krebs cycle only make 4 ATP by the time glucose is
converted to carbon dioxide?
6. Calculation Question:
a. If one ATP molecule holds 7.3kcal of potential energy, how much
potential energy does one glucose molecule produce in cell
respiration?
b. One molecule of glucose actually contains 686kcal of potential energy.
Where does the remaining energy go when glucose is reduced?
c. What is the net efficiency of cell respiration if glucose contains
686kcal and only 277.4 kcal are produced?
7. Explain how it is better for a cell to use many reactions to oxidize glucose
even though each reaction needs a specific enzyme (which is costly to the cell
to produce).