The oxidation of glucose in the presence of oxygen involves glycolysis. pyruvate oxidation, and the citric acid cycle (Krebs cycle). Some energy is captured in glycolysis when glucose is converted to pyruvate (pyruvic acid). In the citric acid cycle (Krebs cycle), more energy is captured in the form of reduced electron carriers, NADH and FADH_2. Select the best explanation for why the eventual reoxidation of NADH and FADH_2 is crucial for the continuation of the citric acid (Krebs) cycle. In order for the cycle to continue, oxidized electron carriers must be available. Without oxidized electron carriers, oxygen will not accept the electrons at the end of the electron transport chain Phosphate cannot attach to ADP to form ATP without oxidized electron carriers. The presence of reduced forms of the electron carriers prevents the formation of ATP.
Show transcribed image textThe oxidation of glucose in the presence of oxygen involves glycolysis. pyruvate oxidation, and the citric acid cycle (Krebs cycle). Some energy is captured in glycolysis when glucose is converted to pyruvate (pyruvic acid). In the citric acid cycle (Krebs cycle), more energy is captured in the form of reduced electron carriers, NADH and FADH_2. Select the best explanation for why the eventual reoxidation of NADH and FADH_2 is crucial for the continuation of the citric acid (Krebs) cycle. In order for the cycle to continue, oxidized electron carriers must be available. Without oxidized electron carriers, oxygen will not accept the electrons at the end of the electron transport chain Phosphate cannot attach to ADP to form ATP without oxidized electron carriers. The presence of reduced forms of the electron carriers prevents the formation of ATP.
Consider a bacterial cell that performs anaerobic respiration. If that bacterial cell had access to six molecules of glucose to use, how many ATP molecules would it be able to produce?
a.
2
b.
34
c.
36
d.
6
e.
12
1 points
QUESTION 3
The oxygen that organisms need to live is used exclusively in which of the following metabolic pathways?
a.
Electron transport chain
b.
Anaerobic respiration
c.
Glycolysis
d.
Krebs cycle
e.
ATP-Synthase
1 points
QUESTION 4
The electron transport chain uses the energy in NADH and FADH2 to pump H+ ions from the matrix to the innermembrane space. The H+ gradient is then used to power ATP-Synthase. Enough H+ is pumped from the energy in a molecule of NADH to produce ______ ATP molecules, while enough H+ is pumped from the energy in a FADH2 molecule to produce ______ ATP molecules.
a.
three; two
b.
three; three
c.
two; two
d.
two; three
1 points
QUESTION 5
Which of the following list contains only products of cellular respiration?
a.
glucose, oxygen, ADP
b.
ATP, carbon dioxide
c.
oxygen, ADP, carbon dioxide
d.
ATP, glucose, oxygen
e.
glucose, ATP
1 points
QUESTION 6
What powers the enzyme ATP-Synthase?
a.
NADH molecules
b.
oxygen (O2)
c.
ATP
d.
NADH and FADH2 molecules
e.
The H+ gradient between the matrix and inner-membrane space
1 points
QUESTION 7
Organisms exist which are able to survive using only glycolysis (i.e. without using oxidative phosphorylation).
True
False
1 points
QUESTION 8
Each ADP molecule contains ________ phosphates, and each ATP molecule contains ________ phosphates.
a.
three; three
b.
two; two
c.
one; two
d.
two; three
e.
one; three
1 points
QUESTION 9
Adding a phosphate group to ADP to form ATP is an endergonic reaction.
True
False
1 points
QUESTION 10
The majority of ATP produced during cellular respiration is produced during glycolysis.
True
False
1 points
QUESTION 11
Glycolysis occurs:
a.
on enzymes located in the inner-membrane.
b.
in the cytosol.
c.
in the inner-membrane space.
d.
in the nucleus of the cell.
e.
in the matrix of mitochondria.
1 points
QUESTION 12
Muscle soreness associated with strenuous exercise is due to:
a.
the production of alcohol during anaerobic respiration.
b.
a buildup of lactic acid.
c.
an excessive amount of ATP that builds up during exercise.
d.
the large amounts of CO2 building up in the muscle.
