Exam 2 BIOC 385 || Questions and 100% Verified Answers.
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Course
BIOC 385
Institution
BIOC 385
Which one of the following is involved in the breakdown of glycogen?
A. Amylase
B. ATP
C. Inorganic phosphate
D. phosphofructokinase correct answers C. Inorganic phosphate
Which enzyme catalyzes the formation of alpha(1,6) linkages during glycogen synthesis?
A. Glycogen synthase
B. Glycoge...
Exam 2 BIOC 385 || Questions and 100% Verified Answers.
Which one of the following is involved in the breakdown of glycogen?
A. Amylase
B. ATP
C. Inorganic phosphate
D. phosphofructokinase correct answers C. Inorganic phosphate
Which enzyme catalyzes the formation of alpha(1,6) linkages during glycogen synthesis?
A. Glycogen synthase
B. Glycogen phosphorylase
C. Branching enzyme
D. Debranching enzyme correct answers C. Branching enzyme
The activation of glycogen phosphorylase will lead to a(n) ____ in blood glucose concentrations
and is stimulated by the hormone _____.
A. Decrease; glucagon
B. Increase; glucagon
C. Decrease; insulin
D. Increase; insulin correct answers B. Increase; glucagon
Because muscles lack receptors for glucagon, what hormone activates muscle glycogen
phosphorylase?
A. Nitric oxide
B. Epinephrine
C. Epidermal growth factor
D. Insulin correct answers B. Epinephrine
Chylomicrons contain a monolayer on the outside of the particle consisting of ________.
A. Cerebrosides and phospholipid
B. Cholesterol and sphingolipids
C. Cerebrosides and sphingolipids
D. Phospholipids and cholesterol correct answers D. Phospholipids and cholesterol
The lipase-mediated release of fatty acids can always be expected to occur when a person is
______ and _____. (Choose the best two answers)
A. Running from a bear; hungry after school
B. Reading a book; studying biochemistry
C. Watching TV; singing a song
D. Eating a hamburger; walking to school correct answers A. Running from a bear; hungry after
school
Chylomicrons contain a monolayer on the outside of the particle consisting of______________.
A. Cerebrosides and sphingolipids.
B. Phospholipids and cholesterol.
C. Cholesterol and sphingolipids.
,D. Cerebrosides and phospholipids. correct answers B. Phospholipids and cholesterol.
How many moles of acetyl-CoA are delivered to cells for each mole of beta-hydroxybutyrate
generated in the ketogenic pathway?(3 is wrong)
A. 1
B. 2
C. 3
D. 4 correct answers B. 2
Snake venom often secretes phospholipase A2 enzymes, which cleave
A. Gangliosides
B. Sphingosines
C. Glycerophospholipids
D. ceramides correct answers C. Glycerophospholipids
Pork fat has a melting temperature of 40ºC and flaxseed oil has a melting temperature of -25ºC.
What contributes to this ~65ºC difference in melting temperature? Choose the ONE best answer.
A. Pork fat contains 40% palmitate and stearate, whereas flaxseed oil is 53% alpha-linolenate,
the difference in average a melting temperature is about 65ºC, so it makes sense.
B. Pork fat is solid and clumpy, whereas flaxseed oil is liquid, so their melting temperatures
reflect the difference in solids over liquids and the amount of enthalpic energy.
C. Animals eat high fatty food, whereas plants use photosynthesis in the hot sun, so the melting
temperature differences reflect the lifestyle of the two organisms.
D. Melting temperature reflects the chemistry and physics of hydrogenated fatty acids compared
to trans fat and polyunsaturated fats, so flaxseed is liquid and pork fat is not. correct answers A.
Pork fat contains 40% palmitate and stearate, whereas flaxseed oil is 53% alpha-linolenate, the
difference in average a melting temperature is about 65ºC, so it makes sense.
Which of the following proteins is activated by phosphorylation during glucagon-activated fatty
acid release from adipocytes?
A. Adipose triglyceride
B. Monoacylglycerol
C. Perilipin
D. Fatty acid binding protein 4 correct answers C. Perilipin
Triacylglycerols are transported through the blood as _____________.
A. Very low density lipoprotein particles
B. Cerebrosides
C. Sphingolipids
D. Glycerophospholipids correct answers A. Very low density lipoprotein particles
Order the following steps in glycogen particle synthesis.
__A branching enzyme adds α-1,6 linkages
__The glycogen synthase activity of glycogenin forms an α-1,4 glycosidic bonds that adds UDP-
glucose to an O-linked glucose residue.
, __The glycosyltransferase activity of glycogenin adds UDP-glucose to a tyrosine residue in
glycogenin.
__Glycogen synthase uses UDP-glucose to form α-1,4 glycosidic bonds that add to the
glycogenin primer
__The glycogen synthase activity of glycogenin uses UDP-glucose to extend the chain up to 7
residues.
__The glycogen synthase activity of glycogenin forms an α-1,4 glycosidic bond that adds UDP-
glucose to an O-linked glucose disaccharide. correct answers 6, 2, 1, 5, 4, 3
A patient is found to have a mutated enzyme that results in fewer branch points in glycogen.
Which one of the following would best characterize the way in which the patient's glycogen is
altered relative to normal glycogen?
A. Their glycogen has an altered stereochemical configuration at the reducing end.
B. Their glycogen contains a decreased ratio of nonreducing to reducing ends
C. Their glycogen has an increase in the proportion of mc075-1.jpg(1,6) linkages relative to
mc075-2.jpg(1,4) linkages.
D. Their glycogen has some β(1,4) linkages in place of mc075-3.jpg(1,4) linkages. correct
answers B. Their glycogen contains a decreased ratio of nonreducing to reducing ends
What is the energy cost in ATP equivalents for adding a molecule of glucose imported from the
blood to a growing glycogen chain?
A. 2 ATP
B. 3 ATP
C. 4 ATP
D. 1 ATP correct answers A. 2 ATP
Liver VLDL lipoprotein particles export two major types of lipids to other tissues,
triacylglycerols are one type, and ___________ is the other type.
A. ganglioside
B. cholesterol
C. Cerebroside
D. sphingophospholipid correct answers B. cholesterol
What is the chemical leaving group in the glycogen synthesis pathway after glucose is added to
the growing glycogen chain?
A. pi
B. glucose-1-phosphate
C. UDP-glucose
D. UDP correct answers D. UDP
What is the metabolic logic that explains why muscle cells lack glucagon receptors?
A. Muscle cells use glucose derived from glycogen degradation as a primary energy source for
muscle contraction.
B. Muscle cells do not need glucagon receptors because they lack the enzyme glycogen
phosphorylase, which is the target of glucagon signaling.
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