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25 questions
Which of the following is not true of glycolysis?
it is the first stage of cellular respiration
it occurs in the cytoplasm
it only occurs if oxygen is present
means the breakdown of sugar
Which of the following terms means the chemical addition of a phosphoryl group (PO3-) to an organic molecule.
oxidation
phosphorylation
reduction
decarboxylation
Energy is stored in molecules when chemical bonds are broken.
True
False
The structure of ATP is most like that of a
simple sugar
fatty acid
amino acid
nucleotide
In cellular respiration, glucose and oxygen produce carbon dioxide, water, and energy.
True
False
Before a molecule of glucose can be broken down to release energy,
one ATP molecule must be added to glucose
two phosphate groups must be attached to glucose
three ATP molecules must be added to glucose
one ATP molecule must be taken away from glucose
Glycolysis depends upon a continuous supply of glucose and
NADH
pyruvate
NAD+
H2O
In the breakdown of glucose, a phosphorylated six-carbon compound is split into two three-carbon compounds called
PGAL
3-PGA
ATP
NADH
Which of the following compounds is phosphorylated in glycolysis?
glucose
water
1,3 DPGA
PGAL
The conversion of PGAL to pyruvate is accomplished by
anaerobic respiration
photophosphorylation
electron transport
Krebs cycle
substrate level phosphorylation
Substrate-level phosphorylation is a metabolic reaction that results in the formation of ATP by the direct transfer of a phosphate group to ADP from another phosphorylated
compound via an enzyme.
True
False
Fructose is a structural isomer of glucose. In the first stage of glycolysis, glucose-6-phosphate is converted into fructose-6-phosphate by the enzyme
hexokinase
aldolase
enolase
isomerase
Kinase catalyzes the conversion of Glucose to Glucose-6-Phosphate, Fructose-6-Phosphate to Fructose-1,6-Phosphate, 1,3DPGA to 3PGA, and PEP to Pyruvate. It can be inferred that kinase is responsible for what process?
oxidation
phosphorylation
reduction
chemiosmosis
Which of the following molecules does not contain an attached phosphate?
pyruvate and glucose
PEP and glucose
PGAL and glucose
PEP and PGAL
DHAP and PGAL
Which of the following is the end product of glycolysis?
acetyl CoA
oxaloacetic acid
pyruvate
citrate
Look at your diagram. Which of the following is the reactant of aerobic and anaerobic respiration?
acetyl CoA
ethanol
PGAL
pyruvate
What substance serves as an electron acceptor in glycolysis?
Water
NAD+
ATP
ADP
NADH
What substance in glycolysis is oxidized by NAD+?
NADH
PGAL
pyruvate
DHAP
Four of the five answers listed below are compounds in the glycolytic reactions. Select the exception
Fructose-1,6-Phosphate
3-Phosphoglycerate
Pyruvate
Phosphoenol pyruvate
isocitrate
Which of the following is not a product of Glycolysis?
Water
Pyruvate
NADH
NAD+
A Net of 2 ATP's
Insulin is responsible for the initiation of simple diffusion, which allows cells to uptake glucose.
True
False
Metabolism Problem Set Problem 1: Glucose conversion Glycolysis leads to the production of ____________ and two molecules of ATP. In the absence of oxygen, fermentation leads to the production of ______________. Glycolysis plus the citric acid cycle can convert the carbons of glucose to _________ , storing the energy as ATP, _____________ and ___________.
lactic acid, pyruvate, CO2, NADH, FADH2
pyruvate, lactic acid, CO2, NADH, FADH2
CO2, NADH, FADH2, lactic acid, pyruvate
O2, lactic acid, pyruvate, FADH2
At the end of glycolysis, each molecule of glucose has yielded 2 molecules of _______, 2 molecules of ________, and a net of 2 molecules of _________.
FAD; NAD+; ADP
CO2; NAD+; ADP
H2O; CO2; ATP
pyruvate, NADH, ATP
Metabolism Problem SetProblem 12: HexokinaseIn the first step of glycolysis, the enzyme hexokinase uses ATP to transfer a phosphate to glucose to form glucose-6-phosphate. The product continues to be oxidized forming pyryvate in glycolysis and is a precursor to acetyl-CoA for the citric acid cycle. Suppose that a cell has only glucose available for energy and that the activity of hexokinase is suddenly stopped in this cell. Which of the following conditions will occur?
The cell will continue to produce energy from mitochondrial electron transport.
The cell will continue to produce ATP using the citric acid cycle.
The cell will ultimately be unable to produce ATP.
The cell will be forced to switch to fermentation to produce ATP.
Glucose is a simple sugar, or monosaccharide, that belongs to what macromolecular group?
lipids
proteins
carbohydrates
nucleic acids
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