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Worksheetsbchm II quiz 1
Total questions: 37
Worksheet time: 19mins
the digestion of dietary carbohydrates always yields ____.
polysaccharides
glucose
monosaccharides
disaccharides
in order to complete the glycolytic process under anaerobic conditions, pyruvate must be _____ so that the pathway can produce the metabolite ____.
oxidized to lactate -- NADH
reduced to lactate -- NADH
oxidized to lactate -- NAD+
reduced to lactate -- NAD+
which of the following glycolytic components has a sufficiently energetic free energy of hydrolysis to provide the work potential needed to produce ATP?
lactate
F-1,6-P
1,3 bisphosphoglycerate
pyruvate
which of the following reactions is catalyzed by the enzyme phosphofructokinase?
F-6-P --> F-1,6-P
pyruvate --> lactate
1,3 BPG --> 3-phosphoglycerate
G-6-P --> F-6-P
complete the reaction: ADP + ___ ---> ATP + ___
ATP -- AMP
ADP --AMP
AMP -- ADP
AMP -- ATP
which of the following sets of anatomical sites supports the reactions that accomplish the digestion of starch?
mouth and stomach
mouth and intestinal lumen
intestinal lumen and liver
stomach and pancreas
the agent NAD+ is formed by the glycolytic pathway as ____.
pyruvate is reduced to lactate
lactate is oxidized to pyruvate
pyruvate is oxidized to lactate
lactate is reduced to pyruvate
how many mM of ATP would be produced as four mM of G-3-P are converted to lactate by the second stage of glycolysis?
2
12
4
8
the portion of the glycolytic pathway that starts with G-6-P and ends with lactate will produce ___ mM of lactate and ___ mM of ATP (net) per mM of G-6-P used.
2 -- 4
2 -- 3
1 -- 2
2 -- 2
the pentose pathway is responsible for the production of the carbohydrate ____, that is used in polynucleotide formation, and the coenzyme ___.
ribose -- NADPH
fructose -- NAD+
glucose -- NADPH
fructose-6-P -- NADP+
the absorption of glucose from the intestinal lumen into the intestinal mucosal cells requires the concomitant absorption of ___ from the intestinal lumen to the intestinal mucosal cells.
Fe3+
Ca2+
K+
Na+
the first stage of glycolysis starts with glucose, ends with ____, and consumes ___ mM of ATP per mM of glucose.
lactate -- 4
dihydroxyacetone-P -- 2
G-6-P -- 2
lactate -- 2
which of the following sets of sugars does not need to be digested before they are absorbed from the intestinal lumen?
ribose & lactose
sucrose & honey
galactose & fructose
honey & lactose
the conversion of four moles of fructose-6-P to lactate via the glycolytic pathway will net ___ moles of ATP.
12
16
8
3
complete the reaction: ___ + ADP ---> ___ + ATP
pyruvate -- lactate
lactate -- pyruvate
phosphoenolpyruvate -- pyruvate
glucose -- G-6-P
pyruvate must be ____ before it can be made into lactate.
reduced
oxidized
phosphorylated
isomerized
according to the phosphogluconate pathway, ____ is (are) used to convert one mole of glucose-6-phosphate into one mole of ribulose-5-phosphate
two moles of F-6-P
one mole of carbon dioxide
two moles of NAD+
two moles of NADP+
the digestion of lactose involves the ___.
oxidation of galactose
reduction of glucose
hydrolysis of a β 1-4 linkage
hydrolysis of a α 1-4 linkage
the glycolytic pathway occurs completely in the cellular ___ and ATP production is accomplished by ___.
cytosol -- substrate-level phosphorylation
mitochondrion -- oxidative phosphorylation
mitochondrion -- substrate-level phosphorylation
cytosol -- oxidative phosphorylation
under anaerobic conditions, the glycolytic pathway ends with the formation of the agent ____.
pyruvate
phosphoenolpyruvate
lactate
F-6-P
how many mM of ATP are produced by the segment of the glycolytic pathway starting with 4 mM of F-6-P and ending with pyruvate? (note: assume anaerobic conditions)
8
16
4
12
which of the following dietary carbohydrates is a simple sugar?
starch
sucrose
fructose
amylose
when glycolysis is performed in the absence of oxygen, the final metabolite in the pathway is ___.
lactate
pyruvate
F-6-P
G-3-P
which of the following simple sugars is found in the glycolytic pathway and the pentose phosphate pathway?
dihydroxyacetone-P
galactose
F-6-P
phosphoenolpyruvate
under aerobic conditions, the glycolytic pathway ends with the formation of the agent ____.
pyruvate
lactate
F-6-P
1,3 bisphosphoglycerate
the activity of the enzyme PFK-1 is increased as the concentration of ____.
ATP increases
Pi increases
ADP decreases
AMP increases
the oxidation of G-6-P by the pentose phosphate pathway results in the formation of ___.
NADP+ and CO2
CO2 and ribulose-5-P
ribose-5-P and 1,3-BPG
NADPH and pyruvate
which of the following sets of metabolites has a sufficiently large free energy of hydrolysis that each of them can power the reaction: ADP + Pi ---> ATP + H2O during glycolysis?
F-6-P and G-6-P
G-6-P and glyceraldehyde-3-P
1,3-BPG and PEP
1,3-BPG and 2,3-BPG
what is the net ATP production from the portion of the glycolytic pathway from F-6-P to lactate starting with one mM of F-6-P? (note: answers are in mM of ATP)
1
2
3
4
which of the following is a summary of the first stage of glycolysis?
glucose ---> DHAP
lactate ---> pyruvate
G-3-P ---> PEP
G-6-P ---> F-1,6-P
which of the following carbohydrates does not need to be digested?
amylose
sucrose
HFCS
starch
the glycolytic reaction that converts NADH to NAD+ is ____.
PEP ---> pyruvate
pyruvate ---> lactate
1,3-BPG ---> 3-phosphoglycerate
F-6-P ---> F-1,6-P
when one mole of glyceraldehyde-3-P is converted to lactate via the reactions of the glycolytic pathway, ____ mole(s) of ATP and ____ mole(s) of lactate will result.
2 -- 2
1 -- 4
4 -- 1
2 -- 1
which of the following components of the pentose pathway is also found in the glycolytic pathway?
ribose-5-P
pyruvate
F-1,6-P
glyceraldehyde-3-P
during glycolysis, substrate-level phosphorylation requires the metabolite ____ to provide the energy needed to produce ATP.
G-6-P
pyruvate
phosphoenolpyruvate
F-1,6-P
the pentose pathway relies on the oxidizing agent ____ to oxidize G-6-P and produce ____, that can be used in generating nucleotides.
NADP+ -- ribose-5-P
NADP+ -- G-3-P
NADH -- F-6-P
NAD+ -- F-1,6-P
allosteric control of the glycolytic pathway is accomplished as the agent ____ inhibits the enzyme ____.
NAD+ -- phosphofructokinase
lactate -- hexokinase
ATP -- PFK
NADH -- lactate dehydrogenase
