Glycolysis occurs: a. only in the presence of oxygen b. only in eukaryotic cells
ID: 11715 • Letter: G
Question
Glycolysis occurs:a. only in the presence of oxygen
b. only in eukaryotic cells
c. whether or not oxygen is present
d. in mitochondria
e. in cells without the assistance of enzymes
Glycolysis:
a. releases all the of the chemical energy in the original glucose molecule
b. occurs in mitochondria
c. produces two molecules that contain much of the chemical energy in the original glucose molecule
d. does not produce any ATP molecules
e. does not require enzymes
The citric acid cycle:
a. produces carbon dioxide. Most of the chemical energy is transferred to the reduced coenzyme NADH
b. directly produces most of ATP formed by breakdown of a glucose molecule
c. is located in the cytoplasm
d. occurs in both prokaryotic and eukaryotic cells
e. does not require enzymes
In anaerobic environments, yeast cells:
a. cannot make any ATP
b. continue to make ATP by oxidative phosphorylation
c. make more ATP than they do when they are in an aerobic environment
d. transfer electrons from NADH to pyruvate so that glycolysis can continue
e. immediately die
I have looked everywhere in the chapter and cannot quite find the answers. These questions seem ambiguous; can someone enlighten me?
Explanation / Answer
Hello!
Glycolysis occurs:
a. only in the presence of oxygen
b. only in eukaryotic cells
c. whether or not oxygen is present (Glycolysis simply requires glucose and ATP input, not oxygen.)
d. in mitochondria
e. in cells without the assistance of enzymes
Glycolysis:
a. releases all the of the chemical energy in the original glucose molecule
b. occurs in mitochondria
c. produces two molecules that contain much of the chemical energy in the original glucose molecule (Glycolysis produces 2, 3-Carbon molecules -- Pyruvate -- which proceed on to the Citric Acid cycle. All of the chemical energy in the original glucose molecule does not get "released" until processing via the Citric Acid Cycle.)
d. does not produce any ATP molecules
e. does not require enzymes
The citric acid cycle:
a. produces carbon dioxide. Most of the chemical energy is transferred to the reduced coenzyme NADH (The citric acid cycle transfers electrons to carriers like NADH by oxidizing carbon sources like Pyruvate, which comes from Glycolysis.)
b. directly produces most of ATP formed by breakdown of a glucose molecule
c. is located in the cytoplasm
d. occurs in both prokaryotic and eukaryotic cells
e. does not require enzymes
In anaerobic environments, yeast cells:
a. cannot make any ATP
b. continue to make ATP by oxidative phosphorylation
c. make more ATP than they do when they are in an aerobic environment
d. transfer electrons from NADH to pyruvate so that glycolysis can continue (This is called anaerobic respiration or fermentation. Essentially, the yeast cell loops back to glycolysis rather than proceed to the citric acid cycle in the absence of oxygen.)
e. immediately die
I hope this helps! Please rate if it does : )
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