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Cellular Respiration and ATP Production
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Cellular Respiration and ATP Production
Cellular Respiration and ATP Production
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1
Question
How does digestion prepare food-derived molecules for cellular use?
0:05
Answer
Digestion breaks food into component chemical compounds and enables their movement into cells.
2
Question
How do digested nutrients reach tissue cells after entering circulation?
0:26
Answer
Nutrients enter the bloodstream, then pass through capillary walls into tissue cells.
3
Question
What happens to glucose during cellular respiration?
0:43
Answer
It is completely oxidized, releasing high-energy electrons.
4
Question
Why does cellular respiration convert food energy into ATP?
0:53
Answer
ATP is a storage form of energy used by most cells.
5
Question
Which four-stage process converts glucose energy into ATP?
1:00
Answer
Cellular respiration.
6
Question
Where does glycolysis occur within a cell?
1:09
Answer
Glycolysis occurs in the cytoplasm.
7
Question
What does the term glycolysis literally mean?
1:06
Answer
It means splitting sugars.
8
Question
Which two phases make up glycolysis?
1:15
Answer
An energy investment phase and an energy harvesting phase.
9
Question
How does the energy investment phase affect glucose?
1:21
Answer
Two ATP molecules transfer energy to glucose, forming a six-carbon sugar diphosphate molecule.
10
Question
What happens to the six-carbon intermediate during glycolysis?
1:29
Answer
It splits, beginning the energy-harvesting phase.
11
Question
How are the two three-carbon molecules processed during glycolysis?
1:35
Answer
They are converted to pyruvate, and ATP is formed.
12
Question
How many reaction steps and enzyme activities are involved in glycolysis?
1:45
Answer
Glycolysis is a 10-step reaction involving multiple enzymes.
13
Question
What is the net ATP yield of glycolysis per glucose molecule?
1:50
Answer
A net of two ATP molecules is produced.
14
Question
Which products does glycolysis yield per glucose besides ATP?
1:53
Answer
Two pyruvate molecules and two NADH molecules.
15
Question
What happens to pyruvate and NADH when oxygen is present?
2:01
Answer
They enter the mitochondria, where the next stage begins.
16
Question
Where does pyruvate move before undergoing oxidation?
2:21
Answer
Pyruvate moves into the mitochondria.
17
Question
Which compound is formed when pyruvate is converted during oxidation?
2:25
Answer
Acetyl-CoA.
18
Question
What happens to electrons during pyruvate oxidation?
2:32
Answer
Electrons are transferred to NAD, producing NADH.
19
Question
What carbon-containing product forms during pyruvate oxidation?
2:37
Answer
Carbon dioxide forms as a carbon is lost.
20
Question
Which alternative name is used for the citric acid cycle?
2:45
Answer
The Krebs cycle.
21
Question
Which starting compound binds acetyl-CoA in the citric acid cycle?
2:50
Answer
Oxaloacetate binds with acetyl-CoA.
22
Question
Why is the citric acid pathway called a cycle?
3:08
Answer
Oxaloacetate is both the pathway's starting and ending compound.
23
Question
How many times does the citric acid cycle run per glucose molecule?
3:16
Answer
It completes twice, once for each pyruvate molecule entering the mitochondria.
24
Question
Which products are generated by pyruvate oxidation and the citric acid cycle per glucose?
3:26
Answer
A net of 8 NADH, 2 FADH₂, 2 ATP, and 6 CO₂.
25
Question
How do NADH and FADH₂ contribute to the next respiration stage?
3:41
Answer
They bring their electrons to the electron transport chain.
26
Question
What structural arrangement characterizes the electron transport chain?
3:58
Answer
It is a series of membrane-bound carriers in the mitochondria that pass electrons from one carrier to another.
27
Question
How does electron transfer through the chain help produce ATP?
4:07
Answer
Energy captured as electrons pass between membrane proteins is used to produce ATP.
28
Question
What do proteins in the electron transport chain pump across a membrane?
4:16
Answer
They pump hydrogen ions across the membrane.
29
Question
How does the return flow of hydrogen ions drive ATP synthesis?
4:21
Answer
Hydrogen ions flow back across the membrane through ATP synthase, which synthesizes ATP.
30
Question
Which molecule serves as the terminal electron acceptor in aerobic respiration?
4:30
Answer
Oxygen accepts electrons at the end of the electron transport chain.