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4.2-4.3 Glycolysis and Fermentation- Aerobic Respiration Questions and Answers 2024
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4.2-4.3 Glycolysis and Fermentation- Aerobic Respiration
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4.2-4.3 Glycolysis and Fermentation-Aerobic Respiration
Glycolysis begins in the __________ and ends in the _____________. - answer
cytoplasm; cytoplasm
The pathway in which glucose is broken down to form pyruvate is called - answer
Glycolysis
Which statement regarding the isomerase enzyme in the first half of glycolysis is true?
-Isomerase catalyzes a one-way reaction.
-Isomerase interconverts glyceraldehyde-3-phosphate to dihydroxyacetone phosphate,
and vice versa.
-Isomerase converts fructose-6-phosphate to fructose-1,6-biphosphate.
-Isomerase is not an enzyme that functions in the first half of glycolysis. - answer
Isomerase interconverts glyceraldehyde-3-phosphate to dihydroxyacetone phosphate,
and vice versa
In the energy investment phase of glycolysis - answer two molecules of ATP are
invested making glucose and its derivatives more reactive.
During two steps in glycolysis, ATP is hydrolyzed in order to form phosphorylated
intermediates. Which two enzymes mediate these respective reactions? -
answerHexokinase; Phosphofructokinase
An important goal of the energy investment phase of glycolysis is the -
answerphosphorylation of a 6-carbon molecule
The role of hexokinase in the first part of glycolysis is: - answerThe phosphorylation of
glucose
Glycolysis accounts for all of the following except
-production of H2O
-production of pyruvic acid
-production of ATP
-production of NADH - answerproduction of pyruvic acid
Which of the following molecules are not formed during glycolysis?
-ATP
-FADH2
, -NADH
-Pyruvate - answerFADH2
Glycolysis is an ________ process in which glucose undergoes _________. -
answerAnaerobic; oxidation
One round of glycolysis - answerinvolves the use of kinase enzymes to synthesize ATP.
During glycolysis - answerglucose is broken down and oxidized to form two pyruvate
molecules, a net of two ATP, and two NADH.
transfers a phosphate group from PEP to form ATP - answerPyruvate kinase
Which of the following molecules is reduced during alcohol fermentation?
-NAD+
-ethanol
-acetaldehyde
-pyruvate - answeracetaldehyde
Fermentation - answerFermentation does not require oxygen. Fermentation is actually a
mechanism for ATP production in the absence of oxygen. Fermentation oxidizes
NADPH + H+ to form NAD+, which is necessary for glycolysis to take place. By
recycling NAD+ in fermentation, the cell is able to exist on the ATP provided by
glycolysis alone in the absence of oxygen.
An important principle of fermentation is that - answerO2 is not used as a final electron
acceptor.
What is the electron acceptor during lactic acid fermentation? - answerpyruvate
Fermentation enables - answerNADH + H+ to be oxidized to form NAD+ so that
glycolysis will continue.
Which of the following statements is true regarding fermentation?
-It is done only in prokaryotic cells.
-It produces a NAD+
-It produces two additional ATP.
-It recycles glucose. - answerIt produces a NAD+
Which statement regarding fermentation is true? - answerIn alchohol fermentation,
pyruvate is first converted to acetaldehyde in a decarboxylation reaction and then
converted to ethanol, forming NAD+
True or false?
Glycolysis yields more ATP than fermentation alone - answerTrue.
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