Download Exam 2 Practice #3

Practice Exam 2
9.
1.
When the reactants have more free energy than the products of a reaction, that
reaction can be described as
a.
Exergonic
e.
A&C
b.
Endergonic
f.
A&D
c.
ΔG > 0
g.
B&C
d.
ΔG < 0
2.
T or F In biological systems all endergonic reactions are directly coupled to exergonic
reactions.
a.
True
b.
False
3.
When compounds such as NADH and FADH2 are ___________, energy is ________
a.
Reduced, released
b.
Reduced, absorbed
c.
Oxidized, released
d.
Oxidized, absorbed
e.
Phosphorylated, coupled
4.
Enzymes are generally _____________ that function as biological ___________.
a.
Proteins, catalysts
b.
Proteins, allosteric regulators
c.
Polynucleotides, energy carriers
d.
Polynucleotides, allosteric regulators
5.
T or F Enzymes change the amount of free energy released or absorbed in a
reaction.
a.
True
b.
False
6.
NADH is the ________________ form of NAD+
a.
Oxidized
b.
Reduced
c.
Coupled
d.
A&B
7.
If an enzyme requires an inorganic molecule to function, this molecule is known as a
a.
Cofactor
b.
Coenzyme
c.
Competitive Inhibitor
d.
Non-competitive Inhibitor
e.
Substrate
8.
Allosteric regulators of PFK include
a.
ATP
b.
ADP
c.
Glucose
d.
A&B
e.
All of the above
The net gain of energy per molecule of glucose in glycolysis is
a.
2 NADH and 4 ATP
b.
2 NADH and 2 ATP
c.
1 NADH and 2 ATP
d.
There is no net gain of energy
10. T or F Of all the energy available to a eukaryotic cell in a glucose molecule, most of this
energy is captured through glycolysis.
a. True
b. False
11. How many ATP are generated per pyruvate molecule in citric acid cycle (Kreb’s Cycle)?
a. 1
b. 2
c. 3
d. 6
e. None, all energy gain is in the form of e- carriers
12. Substrate-level phosphorylation generates __________ in _______________
a. NADH and ATP; Glycolysis and Krebs Cycle
b. NADH and ATP; Krebs Cycle
c. ATP; Glycolysis, Krebs Cycle, and the Electron Transport Chain
d. ATP; Glycolysis and Krebs Cycle
13. When chlorophyll absorbs a photon of light, what initially happens to the energy of the
absorbed photon?
It is transferred to CO2
a.
b. It is transferred to water
c. It is used to make ATP
d. It is transferred to an electron
e. It is transferred to NADPH
14. Cyclic electron flow in the chloroplast produces
a. Glucose
b. NADPH
c. ATP
d. A & B
e. A, B & C
15. In plants, which enzyme is responsible for utilizing the energy of a proton electrochemical
gradient in the production of ATP?
a. ATP synthase
b. H+ ATPase
c. NADPH
d. Plastoquinone
e. Ferredoxin
16. ______________ produces equal amounts of ATP and NADPH
a. Kreb’s Cycle
b. Electron transport chain
c. Cyclic electron flow
d. Non-cyclic electron flow
e. C & D
17. When RuBP carboxylase (rubisco) adds O2 instead of CO2 to RuBP
a.
b.
c.
d.
e.
Photorespiration occurs
CO2 partial pressure is low
A C3 plant is likely experiencing abundant moisture (wet conditions)
A&B
All of the above