Cellular Respiration Practice Test/Quizzes/Quizizz Questions
How many ATP are gained through glycolysis?
2
Starting with one molecule of glucose, the energy-containing products of glycolysis are
2 NADH, 2 pyruvate, and 2 ATP
Each NADH molecule carrying hydrogen to the ETC can produce a maximum of ___ molecules of ATP.
3
Approximately how many molecules of ATP are produced from the complete oxidation of one molecule of glucose in aerobic respiration?
30-32
Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose?
64-68
What enzyme in the ETC is responsible for generating the ATP molecules?
ATP synthase
In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of
ATP, CO₂, and ethanol (ethyl alcohol)
A weightlifter is using heavy weights in short bursts for a competition. Because his muscle cells are not able to take in enough oxygen to make very much ATP the weightlifter begins to get fatigue in his muscles. Which process is most likely going on in the muscles of the weightlifter as he competes in his event?
As the cells run out of oxygen they switch to anaerobic respiration (fermentation), which allows the cell to make small amounts of ATP in the absence of oxygen.
Which of the following statements describes the results of this reaction? C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + energy - O₂ is oxidizes and H₂O is reduced - C₆H₁₂O₆ is oxidized and O₂ is reduced - C₆H₁₂O₆ is reduced and CO₂ is oxidized - O₂ is reduced and CO₂ is oxidized - CO₂ is reduced and O₂ is oxidized
C₆H₁₂O₆ is oxidized and O₂ is reduced.
Why is glycolysis considered to be one of the first metabolic pathways to have evolved?
It does not involve organelles or specialized structures, does not require oxygen, and is present in most organisms.
In liver cells, the inner mitochondrial membranes are about five times the area of the outer mitochondrial membranes. What purpose must this serve?
It increases the surface area for oxidative phosphorylation.
Two different species of bacteria are examine. Scientists find that species X always produces CO₂ and H₂O during cellular respiration. Species Y always produces ethyl alcohol and CO₂. Which conclusion can be made from these observations?
Only species Y is anaerobic.
Energy is released from ATP when
a phosphate group is removed.
In cellular respiration, the energy for most ATP synthesis is supplied by
a proton gradient (hydrogen ions) across a membrane.
The oxygen consumed during cellular respiration is involved directly in which process or event?
accepting electrons at the end of the electron transport chain
The starting molecule for the Krebs cycle is
acetyl CoA
Which molecule enters the Krebs cycle?
acetyl CoA
Which of the following intermediary metabolites enters the citric acid cycle and is formed, in part, by the removal of a carbon (CO₂) from one molecule of pyruvate? - acetyl CoA - lactate - glyceraldehyde-3-phosphate - citrate - oxaloacetate
acetyl CoA
The primary role of oxygen in cellular respiration is to
act as an acceptor for electrons and hydrogen, forming water.
The transport of pyruvate into mitochondria pends on the proton-motive force across the inner mitochondrial membrane. How does pyruvate enter the mitochondrion?
active transport
Glycolysis is a ___ process.
aerobic and anaerobic
Which process takes place in the presence of oxygen and produces nearly 20 times as much ATP as glycolysis alone?
aerobic respiration
Glycolysis is a ___ process. (catabolic or anabolic)
catabolic
What is the term for metabolic pathways that release stored energy by breaking down complex molecules?
catabolic pathways
Where does glycolysis occur?
cytosol
Where does glycolysis take pace in eukaryotic cells?
cytosol
Where does glycolysis take place in eukaryotic cells?
cytosol
Which phase of glycolysis do we see in the input of ATP?
energy investment
In chemiosmosis, what is the most direct source of energy that is used to convert ADP + P to ATP
energy released from movement of hydrogen ions (protons) through ATP synthase, against the electrochemical gradient
ATP hydrolysis is ___ (exergonic or endergonic).
exergonic
An organism is discovered that thrives both in the presence and absence of oxygen in the air. Curiously, the consumption of sugar increases as oxygen is removed from the organism's environment, even though the organism does not gain much weight. This organism is a(n)
facultative anaerobe.
During anaerobic respiration, electrons travel downhill in which sequence?
food → NADH → electron transport chain → oxygen
What are the reactants in the equation for cellular respiration?
glucose and oxygen
Which metabolic pathway is common to both cellular respiration and fermentation?
glycolysis
Which of the following normally occurs regardless of whether or not oxygen (O₂) is present? - oxidative phosphorylation (chemiosmosis) - citric acid cycle - glycolysis - fermentation - oxidation of pyruvate to acetyl CoA
glycolysis
Which process in eukaryotic cells will proceed normally whether oxygen is present or absent?
glycolysis
Which of the following occurs in the cytosol of a eukaryotic cell? - citric acid cycle - fermentation and chemiosmosis - oxidation of pyruvate to acetyl CoA - oxidative phosphorylation - glycolysis and fermentation
glycolysis and fermentation
Which of the following is the correct order of events in cellular respiration? - chemiosmosis → glycolysis → ET → Krebs cycle - ET → chemiosmosis → glycolysis → Krebs cycle - glycolysis → ET → Krebs cycle → chemiosmosis - glycolysis → Krebs cycle → ET → chemiosmosis
glycolysis → Krebs cycle → electron transport → chemiosmosis
Where is ATP synthase located in the mitochondria?
inner membrane
Where does ETC occur?
inner mitochondrial membrane
The substance that is oxidized in a redox reaction
loses electrons
The molecule that functions as the reducing agent (electron donor) in a redox reaction
loses electrons and loses potential energy
Where are the proteins of the electron transport chain located?
mitochondrial inner membrane
The electron transport chain pumps H⁺ into which location in eukaryotic cells?
mitochondrial intermembrane space
The Krebs cycle occurs in the
mitochondrial matrix
During aerobic respiration, H₂O is formed. Where does the oxygen atom for the formation of the water come from?
molecular oxygen (O₂)
Cellular respiration involves the net ___ of glucose.
oxidation
The loss of a hydrogen or electrons is known as
oxidation.
Which of the following produces the most ATP when glucose (C₆H₁₂O₆) is completely oxidized to carbon dioxide (CO₂) and water? - fermentation - oxidative phosphorylation (chemiosmosis) - citric acid cycle - oxidation of pyruvate to acetyl CoA - glycolysis
oxidative phosphorylation (chemiosmosis)
Which gas is a product released during photosynthesis that humans need for survival?
oxygen
after strenuous exercise, a muscle cell would contain decreased amounts of ___ and increased amounts of ___.
oxygen; lactic acid
NADH is a ___ form of NAD+.
reduced
During glycolysis, when each molecule of glucose is catabolized to two molecules of pyruvate, most of the potential energy in glucose is
retained in the two pyruvates
The ATP made during fermentation is generated by
substrate-level phosphorylation
The ATP made during glycolysis is generated by
substrate-level phosphorylation
What function does ATP carry out in living things?
used to capture and transfer energy
Which of these is a product of aerobic respiration? - water - oxygen - glucose - lactic acid
water
