1. The principle action of the anaerobic phase of glycolysis (fast glycolysis) i
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Question
1. The principle action of the anaerobic phase of glycolysis (fast glycolysis) is to:
a. degrade glucose or glycogen into pyruvic acid or lactic acid and produce some ATP
b. form NADH and FADH
c. degrade lactic acid to pyruvic acid
d. generate high-energy compounds such as GTP
2. Most of the Aerobic production of ATP occurs:
a. in the mitochondria in a process called glycogenolysis
b. in the mitochondria in the electron transport chain
c. in the mitochondria in a process called beta oxidation
d. in the cytoplasm
3. Carbohydrate metabolism involves
a. the formation of pyruvate
b. the formation of Acetyl-CoA
c. the net yield of approximately 36-39 ATP for each molecule of glucose
d. all of the above
4. The substrate at the beginning of the Krebs cycle:
a. is acetyl Co a
b. may have originated from carbohydrates, lipids, or proteins
c. originates from carbohydrates only
d. a and b
e. a and c
5. The blood lactate threshold refers to:
the work rate or oxygen uptake where there is a systematic rise in aerobic metabolism
the work rate or oxygen uptake where there is a systematic rise in blood levels of lactic acid
the work rate or oxygen uptake where there is a systematic decrease in blood levels of lactic acid
d. all of the above are correct
6. Which statement is false concerning lactic acid?
It is formed during fast glycolysis
It is formed when hydrogens combine temporarily with pyruvate
It can diffuse into the blood and be carried away from the site of production
It is a by-product of a high rate of protein breakdown
7. Metabolic processes that are considered aerobic include:
Krebs cycle
electron transport chain
beta oxidation
all of the above
8. Which of the following is not a prerequisite for continuous aerobic production of ATP?
acetyl COA must be present
NAD and FAD must be available
oxygen must be present in the tissues
cellular enzymes must be present in sufficient concentration
all the above are necessary
9. This energy system has the most rapid ability to phosphorylate ADP and form ATP:
electron transport chain
ATP-PC
substrate-level phosphorylation via electron transport chain
Krebs cycle
10. Which statement is false concerning oxidative production of ATP in the electron transport chain?
It is a process of ATP production via the transfer of electrons from hydrogen to oxygen
only small amounts of ATP are produced in the ETC
3 ATP are formed for each NADH oxidized in the ETC
2 ATP are formed for each FADH oxidized in the respiratory chain
.11. The immediate energy system (ATP-PC) relies on:
a. the reactions of glycolysis
oxygen availability in the immediate cellular environment
the high-energy phosphates stored in muscle cells
the oxidation of lactate
12. Which of the following terms is/are associated with the body’s capacity to produce ATP aerobically
maximal oxygen uptake
aerobic capacity
oxygen consumption
all of the above
Explanation / Answer
1. Option A is correct.
Fermentation occurs during anaerobic conditions to produce ATP and to regenerate NAD+.
2. Option B is correct.
Most of the ATP production occurs during aerobic respiration by ETC.
3. Option D is correct.
Carbohydrate metabolism involves glycolysis, TCA cycle, and ETC.
4. Option D is correct.
Acetyl CoA is the starting molecule of TCA cycle. It is produced by carbohydrates, lipids, and proteins.
5. Option B is correct.
The blood lactate threshold refers to the work rate or oxygen uptake where there is a systematic rise in blood levels of lactic acid.
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