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AP Biology MCQ
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11
What regulates the flux through the irreversible steps in glycolysis?
A:
Concentration of substrates
B:
Activity levels of specific enzymes
C:
Availability of oxygen
D:
All of these factors
12
In which cellular component does substrate-level phosphorylation occur during glycolysis?
A:
Mitochondria
B:
Cytoplasm
C:
Nucleus
D:
Endoplasmic reticulum
13
Which reaction generates water as a byproduct during glycolysis?
A:
Conversion of glucose to glucose-6-phosphate
B:
Conversion of phosphoenolpyruvate to pyruvate
C:
Conversion of dihydroxyacetone phosphate to glyceraldehyde-3-phosphate
D:
None generate water directly
14
What does the term “ATP investment phase” refer to in glycolysis?
A:
The phase where no ATP is consumed.
B:
The phase where ATP is generated.
C:
The initial steps where ATP is consumed.
D:
The final steps where energy is released.
15
How many molecules of NADH are produced per molecule of glucose during glycolysis?
B:
1
C:
2
D:
4
16
Which compound serves as an allosteric regulator derived from a glycolytic intermediate?
A:
Lactate
B:
Acetyl-CoA
C:
2,3-Bisphosphoglycerate
D:
Fructose-2,6-bisphosphate
17
Which enzyme regulates one of the key irreversible steps in glycolysis by converting fructose-6-phosphate into fructose-1,6-bisphosphate?
A:
Hexokinase
B:
Phosphofructokinase-1
C:
Pyruvate kinase
D:
Aldolase
18
Which metabolic pathway does pyruvate enter when oxygen is present?
A:
Glycolysis
B:
Fermentation
C:
TCA cycle
D:
Lipid synthesis
19
What happens to glucose when it enters glycolysis?
A:
It remains unchanged.
B:
It gets phosphorylated.
C:
It gets oxidized directly.
D:
It forms fatty acids.
20
The conversion of which molecule leads to the production of lactate in anaerobic conditions?
A:
Glyceraldehyde-3-phosphate
B:
Fructose-1,6-bisphosphate
C:
Pyruvate
D:
Acetyl-CoA
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