Cellular respiration quizzes
Predict how many molecules of carbon dioxide are produced from the mitochondrial "burning" of one molecule of glucose?
6
The main function of cellular respiration is to produce:
ATP
The enzyme phosphofructokinase (PFK) catalyzes a key step in glycolysis. PFK is inhibited by high levels of which of the following molecules?
ATP and citrate
Chemiosmosis in mitochondria directly results in the synthesis of:
ATP.
Which of the following statements best describes the primary role played by oxygen in cellular respiration?
It serves as the final acceptor for electrons from the electron transport chain.
Alcohol is a waste product produced by yeast in the presence of sugar and the absence of ________.
O2
Following glycolysis and the citric acid cycle, but before the electron transport chain and oxidative phosphorylation, the carbon skeleton of glucose has been broken down to CO2 with some net gain of ATP. Most of the energy from the original glucose molecule at that point in the process, however, is stored in the form of which of the following molecules?
NADH
Which electron carrier(s) function in the citric acid cycle?
NADH and FADH2
When oxygen is present:
most animal cells utilize aerobic cellular respiration
Carbon dioxide (CO2) is released during which of the following stages of cellular respiration?
oxidation of pyruvate to acetyl CoA and the citric acid cycle
In the absence of oxygen, suppose a single yeast cell undergoes fermentation and uses 100 molecules of glucose. How many molecules of ATP will be generated?
200
Which of the listed statements describes the results of the following reaction? C6H12O6+ 6 O2→ 6 CO2+ 6 H2O + Energy
C6H12O6 gets oxidized and O2 gets reduced
A cell has enough available ATP to meet its needs for about 30 seconds. What is likely to happen when an athlete exhausts his or her ATP supply?
Catabolic processes are activated that generate more ATP.
During which stage of cellular respiration is the majority of the ATP produced?
Electron transport chain
Which stage of cellular respiration requires oxygen that you breathe?
Electron transport chain
Identify the stage (or stages) of cellular respiration that occurs entirely outside of the mitochondria.
Glycolysis
Why does yogurt taste sharp?
The taste is from the lactic acid it contains, and acids taste sharp.
Can energy be harvested by the cells from glucose without oxygen?
Yes, but much less than with oxygen.
In the presence of oxygen, the three-carbon compound pyruvate can be catabolized in the citric acid cycle. First, however, the pyruvate (1) loses a carbon, which is given off as a molecule of CO2, (2) is oxidized to form a two-carbon compound called acetate, and (3) is bonded to coenzyme A. Which of the following sets of products result from these reactions?
acetyl CoA, NADH, and CO2
In chemiosmosis, what is the most direct source of energy that is used to convert ADP + i to ATP?
energy released from movement of protons through ATP synthase, down their electrochemical gradient
The anaerobic breakdown of glucose is called:
fermentation.
From the beginning of glycolysis to the end of the Krebs cycle, what has the cell gained from the breakdown of each molecule of glucose?
four molecules of ATP, 10 of NADH, and two of FADH2
During glycolysis, two ATP molecules are "spent" in order to convert glucose to the highly reactive molecule:
fructose 1,6-bisphosphate
In human muscle cells, fermentation (by itself) produces:
lactate
Which parts of the mitochondria are directly involved in the synthesis of ATP during chemiosmosis?
matrix and inner membrane
Where are the proteins of the electron transport chain located?
mitochondrial inner membrane
Which of the following processes generates a proton-motive force in mitochondria?
pumping of hydrogen ions from the mitochondrial matrix across the inner membrane and into the intermembrane space
The end product of glycolysis is
two pyruvate molecules.
