Lungs are to breathing as _____ are to cellular respiration.
a. alveoli
b. chloroplasts
c. mitochondria
d. bronchi
In an experiment, mice were fed glucose (C6H12O6) containing a small amount of radioactive oxygen. The mice were closely monitored, and in a few minutes, radioactive oxygen atoms showed up in __________.
a. ATP
b. water
d. carbon dioxide
As shown below, an electron carrier, such as __________, acts as an energy-storage molecule when it is __________.
a. NAD+ … reduced
b. NAD+ … oxidized
c. NADH … oxidized
d. NADH … reduced
In the equation shown below, during cellular respiration _____ is oxidized and _____ is reduced.
a. carbon dioxide … water
b. ATP … oxygen
c. glucose … oxygen
d. oxygen … ATP
How many NADH are produced by glycolysis?
a. 4
b. 1
c. 3
d. 5
e. 2
In glycolysis, ATP molecules are produced by _____.
a. photophosphorylation
b. oxidative phosphorylation
c. photosynthesis
d. cellular respiration
e. substrate-level phosphorylation
Which of these is NOT a product of glycolysis?
a. water
b. NADH + H+
c. FADH2
d. ATP
e. pyruvate
In glycolysis, what starts the process of glucose breakdown?
a. Pyruvate
b. FADH2
d. ATP
e. ADP
In glycolysis there is a net gain of _____ ATP.
a. 5
b. 3
c. 1
d. 4
e. 2
Which of these enters the citric acid cycle (also called the Krebs cycle)?
a. G3P
b. pyruvate
c. glucose
d. acetyl CoA
e. NADH + H+
In the citric acid cycle (also called the Krebs cycle), ATP molecules are produced by _____.
a. cellular respiration
b. photosynthesis
c. photophosphorylation
d. substrate-level phosphorylation
e. oxidative phosphorylation
Which of these is NOT a product of the citric acid cycle (also called the Krebs cycle)?
a. CO2
b. NADH + H+
c. FADH2
d. ATP
e. acetyl CoA
A scientist wants to study the enzymes of the citric acid cycle in eukaryotic cells. What part of the cell would she use as a source of these enzymes?
a. mitochondrial matrix
b. mitochondrial inner membrane
c. cytoplasm
d. plasma membrane
Through respiration, humans breathe in O2 and breathe out CO2. However, what would happen if we did not breathe in O2?
a. We would not be able to synthesize organic molecules from inorganic molecules.
b. We would not have enough enzymes to catalyze reactions.
c. We would not be able to perform lactic acid fermentation.
d. We would not make enough ATP to meet our energy requirements
A single glucose molecule produces about 38 molecules of ATP through the process of cellular respiration. However, this only represents approximately 38% of the chemical energy present in this molecule. The rest of the energy from glucose is _____.
a. used to make water from hydrogen ions and oxygen
b. stored as fat
c. used directly for energy
d. converted to heat
In muscle cells, fermentation produces _____.
a. pyruvate
b. carbon dioxide, ethanol, NAD+, and ATP
c. carbon dioxide, ethanol, NADH, and ATP
d. lactate and NAD+
e. lactate and NADH
Sports physiologists at an Olympic training center want to monitor athletes to determine at what point their muscles begin to function anaerobically. They could do this by checking for a buildup of _____.
a. lactic acid
b. carbon dioxide
c. ADP
d. ATP

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