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WorksheetsUnit 3
Total questions: 25
Worksheet time: 13mins
What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
Fermentation pathways
Anabolic pathways
Catabolic pathways
Thermodynamic pathways
Which of the following is likely to lead to an increase in the concentration of ATP in a cell?
an increased amino acid concentration
an increased influx of cofactor molecules
an increase in a cell's anabolic activity
an increase in a cell's catabolic activity
What does the chemiosmotic process in chloroplasts involve?
establishment of a proton gradient across the thylakoid membraneB
diffusion of electrons through the thylakoid membrane
reduction of water to produce ATP energy
movement of water by osmosis into the thylakoid space from the stroma
What molecule is the final electron acceptor at the end of the Electron transport chain of cellular respiration?
NAD
CO2
Oxygen
Glucose
The oxidation of glucose to two molecules each of pyruvate, ATP, and NADH is called ________ and occurs in the cytoplasm
fermentation
krebs cycle
glycolysis
ETC
Which is not produced in the light dependent reactions of photosynthesis?
ATP
Oxygen
NADPH
Pyruvates
Which of the following shows the correct sequence during cellular respiration?
Glycolysis → Electron transport chain → Krebs cycle
Glycolysis → Krebs cycle → Electron transport chain
Krebs cycle → Electron transport chain → glycolysis
Electron transport chain → glycolysis → Krebs cycle
The movement of which ion across the membrane from the intermembrane space to the matrix causes ATP synthase to spin and make ATP?
H+ ions
Water
Oxygen
Na+ ions
Why will the enzyme sucrase only act on sucrose and not bind to other disaccharides, such as maltose?
Because of sucrose’s molecular formula
Because sucrose has a 1-2 glycosidic linkage and maltose has a 1-4 glycosidic linkage
Because sucrose fits perfectly into sucrase’s active site, and other disaccharides do not
Because sucrose contains fructose
Which of the following is not an example of a catabolic pathway?
Glycolysis
Cellular Respiration
Citric Acid Cycle
Photosynthesis
Which part of photosynthesis takes place in the stroma, uses ATP and NADPH to convert CO2 to the sugar G3P, and returns ADP and NADP+?
Chemiosmosis
ETC
Light Reactions
Calvin Cycle
Which of the following reactions represents photosynthesis?
6CO2 + 6H2O + Energy → C6H12O6 + 6O2
C6H12O6 + 6O2 → 6CO2 + 6H2O + Energy
C4H6O5 + NAD+ → C4H4O5 + NADH + H+
Pyruvate + NADH + H+ → Lactate + NAD
Which of the following statements regarding enzymes is true?
Enzymes decrease the free energy change of a reaction.
Enzymes increase the rate of a reaction.
Enzymes change the direction of chemical reactions.
Enzymes are permanently altered by the reactions they catalyze.
The mechanism in which the end product of a metabolic pathway inhibits an earlier step in the pathway is known as
metabolic inhibition
feedback inhibition
allosteric inhibition
noncooperative inhibition
How does a non-competitive inhibitor decrease the rate of an enzyme reaction?
by acting as a coenzyme for the reaction
by changing the free energy change of the reaction
by changing the structure of the enzyme
by binding at the active site of the enzyme
An enzyme catalyzes a reaction by
supplying the energy to speed up a reaction
lowering the energy of activation of a reaction
changing the equilibrium of a spontaneous reaction
increasing the amount of free energy in a reaction
When a molecule of NAD⁺ gains a hydrogen atom, the molecule becomes
A) dehydrogenated.
B) oxidized.
C) reduced.
D) redoxed.
E) hydrolyzed.
Oxidized
Synthesized
Reduced
Hydrolyzed
The ATP made during glycolysis is generated by
Photophosphorylation
Chemiosmosis
Electron transport
Substrate-level phosphorylation
In addition to ATP, what are the end products of glycolysis?
CO₂ and H₂O
CO₂ and pyruvate
NADH and pyruvate
H₂O, FADH₂, and citrate
Where are the proteins of the electron transport chain located?
Mitochondrial matrix
Mitochondrial outer membrane
Mitochondrial intermembrane space
Mitochondrial inner membrane
Electrons increase in ________ as they move down the ETC
Electronegativity
Size
Neutrons
Mass
How many carbon atoms are fed into the citric acid cycle as a result of the oxidation of one molecule of pyruvate?
2
4
6
8
The primary role of oxygen in cellular respiration is to
yield energy in the form of ATP as it is passed down the respiratory chain
act as an acceptor for electrons and hydrogen, forming water
combine with carbon, forming CO₂
combine with lactate, forming pyruvate
One function of both alcohol fermentation and lactic acid fermentation is to
Reduce NAD⁺ to NADH
Reduce FAD⁺ to FADH₂
Oxidize NADH to NAD⁺
None of the above
An electron loses potential energy when it
shifts to a less electronegative atom
shifts to a more electronegative atom
moves further away from the nucleus of the atom
increases its activity as an oxidizing agent
