WorksheetsAP.Bio Unit 3 Review Cellular Energetics
Total questions: 44
Worksheet time: 32mins
Enzymes are
proteins that function as catalysts
broken down in reactions that require energy input
used up in chemical reactions.
not needed for catabolic reactions
A degradative process such as cellular respiration can also be known as...
catabolic pathway
kinetic pathway
endergonic pathway
anabolic pathway
Which of the following statements is (are) true about enzyme-catalyzed reactions?
The reaction is faster than the same reaction in the absence of the enzyme.
The free energy change of the reaction is opposite from the reaction in the absence of the enzyme.
The reaction always goes in the direction toward chemical equilibrium
Enzyme-catalyzed are always exergonic/catabolic
What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
anabolic pathways
catabolic pathways
fermentation pathways
thermodynamic pathways
Which of the following statements describes NAD+?
NAD+ is reduced to NADH during glycolysis and the citric acid cycle.
NAD+ has more chemical energy than NADH.
NAD+ is oxidized by the action of hydrogenases.
NAD+ can donate electrons for use in oxidative phosphorylation.
In the absence of NAD+, glycolysis can still function.
Where does glycolysis take place in eukaryotic cells?
cytosol
mitochondrial outer membrane
mitochondrial intermembrane space
mitochondrial matrix
A partial degradation of sugars or other organic fuel that occurs without the use of oxygen
Aerobic Respiration
Fermentation
Cellular Respiration
Photosynthesis
Where does the citric acid cycle take place?
Golgi Apparatus
Cytosol
Chloroplast stroma
Mitochondrial matrix
Most of the CO2 from the catabolism of glucose is released during...
electron transport
glycolysis
the citric acid cycle
chemiosmosis and oxidative phosphorylation
During aerobic respiration, electrons travel downhill in which sequence?
glucose → pyruvate → ATP → oxygen
glucose → ATP → ETC → NADH
glucose → NADH → ETC → oxygen
glucose → ATP → FADH2 → citric acid
The oxygen consumed during cellular respiration is involved directly in which process or event?
glycolysis
the citric acid cycle
the reduction of NAD+ to NADH
accepting electrons at the end of the ETC
Which of the following binds to the active site of an enzyme?
water
ATP
substrate
another enzyme
Which of the following factors would you not expect to influence the action of enzymes?
Temperature of the cytoplasm
The amount of reactant in the cell
pH of the cytoplasm
Relative humidity
What does photosynthesis need to replenish the electrons used to produce high energy sugars?
Oxygen
ATP
Carbon Dioxide
Water
In oxidative phosphorylation, what is the most direct source of energy that is used to convert ADP + Pi to ATP?
energy released as electrons flow through the electron transport system.
energy released from substrate-level phosphorylation.
energy released from ATP synthase pumping hydrogen ions against their concentration gradient.
energy released from the movement of protons (H+) through ATP synthase.
No external source of energy is required because the reaction is exergonic.
A plant has a unique photosynthetic pigment. The leaves of this plant appear to be reddish yellow. What wavelengths of visible light are not being absorbed by this pigment?
red and yellow
blue and violet
green and yellow
blue, green, violet and red
Which of the following statements is true concerning the figure?
It represents cell processes to minimize photorespiration
It represents an adaptation to cellular respiraiton
It is an aerobic pathway that mimics photosynthesis
It represents the type of cell structures found in CAM plants
CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they
fix CO2 into organic acids during the night.
fix CO2 into organic acids in bundle-sheath cells.
fix CO2 into pyruvate in the mesophyll cells.
use photosystems at night
In which compartment of the plant cell do the light- independent reactions of photosynthesis take place?
thylakoid
stroma
outer membrane
mesophyll
Cyanobacteria are photosynthetic bacteria. They accomplish photosynthesis is nearly the same way as algae and plants but without
chloroplasts
chlorophyll
water
CO2
The enzyme creatine phosphokinase is known to directly participate in the phosphorylation of ADP to ATP. High levels of ADP would most likely
increase the activity of the enzyme
decrease the activity of the enzyme
over stimulate the enzyme's active site causing denaturation
act as an allosteric inhibitor
What do the electrons added to NAD+ do?
They become part of a fermentation pathway.
They go to another pathway for ATP production.
They energize the entry of the acetyl group into
the citric acid cycle.
They are converted to NADP.
An allosteric inhibitor does which of the following?
Binds to an enzyme away from the active site and changes the conformation of the active site, increasing its affinity for substrate binding
Binds to the active site and blocks it from binding substrate
Binds to an enzyme away from the active site and changes the conformation of the active site, decreasing its affinity for the substrate
Binds directly to the active site and mimics the substrate
Energy is stored long-term in the bonds of _____ and used short-term to perform work from a(n) _____ molecule.
ATP : glucose
an anabolic molecule : catabolic molecule
glucose : ATP
a catabolic molecule : anabolic molecule
Which of the following properly describes the metabolic role of fermentation in certain cells?
It is an exergonic reaction that fuels the endergonic phosphorylation of ADP to ATP
It oxidizes NADH to NAD+ allowing for glycolysis to continue
It produces FADH molecules used in oxidative phosphorylation
It removes the oxygen to produce an aerobic condition
Which statement is true according to the image?
A: endergonic; B: exergonic
A: exothermic; B: endothermic
A: exergonic; B: endergonic
A: endothermic; B: exothermic
