BIOC 385 exam 2 questions well
answered
The lipase-mediated release of fatty acids can always be expected to occur when a person is -
correct answer ✔✔running for a bear
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 answer ✔✔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.
Order the following steps in glycogen particle synthesis. - correct answer ✔✔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
, 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 answer ✔✔1 ATP/glucose residue
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 answer ✔✔2 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 answer
✔✔- 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.
Which particles transport triacylglycerols to adipose tissue for storage? - correct answer
✔✔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 answer ✔✔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.
The role of glycogenin is to - correct answer ✔✔serve as the origin of the glycogen polymer.
Match the class of lipid with specific membrane lipids. If the name of lipid does not match a
class of lipid then use "neither" as your answer. - correct answer ✔✔- glucocorticoid (neither)
-cerebroside (sphingolipid)
answered
The lipase-mediated release of fatty acids can always be expected to occur when a person is -
correct answer ✔✔running for a bear
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 answer ✔✔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.
Order the following steps in glycogen particle synthesis. - correct answer ✔✔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
, 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 answer ✔✔1 ATP/glucose residue
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 answer ✔✔2 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 answer
✔✔- 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.
Which particles transport triacylglycerols to adipose tissue for storage? - correct answer
✔✔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 answer ✔✔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.
The role of glycogenin is to - correct answer ✔✔serve as the origin of the glycogen polymer.
Match the class of lipid with specific membrane lipids. If the name of lipid does not match a
class of lipid then use "neither" as your answer. - correct answer ✔✔- glucocorticoid (neither)
-cerebroside (sphingolipid)
