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BIOC 385 Exam 2 || Already Passed.
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Order the following steps in glycogen particle synthesis correct answers 1- The glycosyltransferase activity of glycogenin adds UDP-glucose to a tyrosine residue in glycogenin. 2- The glycogen synthase activity of glycogenin forms an α-1,4 glycosidic bonds that adds UDP-glucose to an O-linked glu...

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  • August 20, 2024
  • 9
  • 2024/2025
  • Exam (elaborations)
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  • order the following steps in glycogen particle syn

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BIOC 385 Exam 2 || Already Passed.
Order the following steps in glycogen particle synthesis correct answers 1- The
glycosyltransferase activity of glycogenin adds UDP-glucose to a tyrosine residue in glycogenin.
2- The glycogen synthase activity of glycogenin forms an α-1,4 glycosidic bonds that adds UDP-
glucose to an O-linked glucose residue.
3- The glycogen synthase activity of glycogenin forms an α-1,4 glycosidic bond that adds UDP-
glucose to an O-linked glucose disaccharide.
4- The glycogen synthase activity of glycogenin uses UDP-glucose to extend the chain up to 7
residues.
5- Glycogen synthase uses UDP-glucose to form α-1,4 glycosidic bonds that add to the
glycogenin primer
6- A branching enzyme adds α-1,6 linkages

Individuals with McArdle's disease has defects in muscle glycogen phosphorylase. As a result,
individuals with McArdle's disease have an exercise intolerance with fatigue and cramps,
however, after a period of exercise they experience a "second wind" of energy. The second wind
results from cardiovascular adjustments that allow glucose to be mobilized from liver glycogen
to fuel muscle contraction, though this is less efficient.

Choose the ONE best answer below that explains why the amount of ATP derived in the muscle
from circulating glucose is less than the amount of ATP that would be obtained by mobilizing
the same amount of glucose from muscle glycogen. correct answers The conversion of glucose to
lactate in muscle generates 2 ATP. If muscle glycogen could be mobilized, the energy yield
would be 3 ATP, since phosphorolysis of glycogen bypasses the hexokinase-catalyzed step of
glycolysis that consumes ATP.

Why is essential to vigorously agitate dirty clothes with liquid soap in water, why not just let the
soap soak into the dirt and then rinse it off? Choose the TWO best answers. correct answers -
Soaking the dirt with liquid soap does not allow the micelles to form, but rather just coats the
dirt.

- Vigorous agitation breaks up the fatty acids into micelles that are then rinsed away with the dirt
inside.

What would be the cost in ATP per glucose residue if glycogen phosphorylase and glycogen
synthase removed and added glucose, respectively, to the ends of glycogen at the same time?
Assume that the glucose used in these reactions comes from glucose-6P. Choose the ONE best
answer. correct answers 1 ATP/ glucose residue

The lipase-mediated release of fatty acids can always be expected to occur when a person is
correct answers running from a bear

Which particles transport triacylglycerols to adipose tissue for storage? correct answers
chylomicrons

, Pork fat has a melting temperature of 40ºC and flaxseed oil has a melting temperature of -24ºC.
What contributes to this ~65ºC difference in melting temperature? Choose the ONE best answer.
correct answers 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.

Starting from a molecule of glucose imported from the blood, what is the energy cost for adding
that molecule of glucose to a growing glycogen chain? correct answers 2 ATP

The role of glycogenin is to correct answers serve as the origin of the glycogen polymer.

Which type of phospholipid provides the fatty acid for lecithin-cholesterol acyltransferase to
produce cholesterol esters? correct answers Phosphatidylcholine

Which of the following statements is true concerning ketogenesis? correct answers ***The
correct answer is not given.


Ketogenesis is inhibited when carbohydrate sources are limited due to starvation.


Ketoacidosis is caused by high blood pH due to high ketogenesis activity producing more ketone
bodies than can be used by the body.


Acetyl-CoA and β-hydroxymyristate are known as ketone bodies.


The brain is unable to use ketone bodies as fuel.

Why is less ATP obtained from the average carbon in a sugar molecule than from a carbon in a
fat molecule? correct answers The sugar carbons require more water weight during cellular
storage.


The carbons in fatty acids are a more oxidized form of carbon than those in sugars.


***The correct answer is not given.


The sugar carbons yield more NADH than ATP.


The sugar carbons are derived from CO2.

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