Biochemistry : Other Glycolysis Concepts
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Example Question #11 : Other Glycolysis Concepts
Which of the following processes occurs in the cytoplasm of a cell?
Oxidative phosphorylation
Krebs cycle
Glycolysis
All of these occur in the cytoplasm
Electron transport chain
Glycolysis
Glycolysis is the only of the above choices that occurs in the cytoplasm. The remaining occur in different parts of the mitochondria. The Krebs cycle occurs in the mitochondrial matrix. Both oxidative phosphorylation and the electron transport chain occur along the inner mitochondrial membrane.
Example Question #12 : Other Glycolysis Concepts
When during cellular respiration is 
The Krebs cycle
The electron transport chain
The oxidative phase of the pentose phosphate pathway
Glycolysis
The non-oxidative phase of the pentose phosphate pathway
The oxidative phase of the pentose phosphate pathway
Example Question #13 : Other Glycolysis Concepts
Which statement is false regarding glycolysis?
Glucose is oxidized.
Hexokinase catalyzes the conversion of glucose to glucose-6-phosphate.
Every step is irreversible.
2 NADH are produced
2 Pyruvate are produced.
Every step is irreversible.
In glycolysis, glucose is oxidized, and the final products are 2 pyruvate, 2 ATP, and 2 NADH. The first step is irreversible, and is the conversion of glucose to glucose-6-phosphate by the enzyme hexokinase. The only remaining answer choice is "every step is irreversible." That statement is false. Steps 1,3, and 10 are irreversible, but the remaining steps are reversible.
Example Question #14 : Other Glycolysis Concepts
How does fructose get metabolized by the body?
I. Fructose-1-phosphate is converted to glyceraldehyde.
II. Fructose is converted to fructose-1-phosphate by fructokinase in the liver.
III. Glyceraldehyde-3-phosphate from fructose is used in both glycolysis and gluconeogenesis.
III only
II only
II and III
I, II, and III
I and III
I, II, and III
Fructose is mainly metabolized by the liver from sugar, honey and fruits. Fructose can be converted to fructose-1-phosphate and then to dihydroxyacetone phosphate (DHAP) and glyceraldehyde.
Example Question #15 : Other Glycolysis Concepts
Which of the following is false of NADPH?
It is created during the oxidative phase of the pentose phosphate pathway.
All of these
It is typically consumed during anabolic reactions.
It is easily discriminated from NADH in the body.
It protects the cell from oxidative stress.
All of these
NADPH is a molecule created during the oxidative phase of the pentose phosphate pathway. It is used in anabolic reactions, specifically in the formation of fatty acids. Another important role is that it acts as an anti-oxidant. Finally, NADPH is easily discriminated from NADH in the body because of an additional attached phosphate group. This allows the body to regulate the concentrations of the two similar molecules independently.
Example Question #16 : Other Glycolysis Concepts
Which of the following are true about lactate dehydrogenase?
I. Lactate dehydrogenase converts reversibly pyruvate to lactate under anaerobic conditions.
II. Lactate dehydrogenase is also important in gluconeogenesis by converting lactate to pyruvate.
III. Lactate dehydrogenase oxidizes NADH to prevent its accumulation in anaerobic conditions.
IV. There are 5 lactate dehydrogenase isoenzymes that differ in their tissue distribution.
II, III, and IV
I, II, III and IV
I and IV
I and II
I, II, and III
I, II, III and IV
A dehydrogenase is an enzyme that removes hydrogen ions from a molecule, thereby oxidizing it.Lactate dehydrogenase converts lactate to pyruvic acid and NADH to NAD+ in glycolysis.The reaction is reversible, in which case it provides pyruvate for gluconeogenesis.Lactate dehydrogenase is present in most tissues with some isoforms more frequent than others. For example, isoenzyme LDH-1 is found in the heart, red blood cells, and brain.
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