BIOC 385 Exam 2 (well answered)
already passed
Why is is essential to vigorously agitate dirty clothes with liquid soap in water, why not just let
the soap into the dirt and rinse it off? - correct answer ✔✔Vigorous agitation breaks up the
fatty acids into micelles that are then rinsed away with the dirt inside.
Soaking the dirt with liquid soap does not allow the micelles to form, but rather just coats the
dirt.
Predict the structure of a fatty acid that is trans 16:2 (delta9,11). - correct answer ✔✔H2C-CH2-
CH2-CH2-CH=CH-CH=CH-CH2-CH2-CH2-CH2-CH2-CH2-CH2-COOH
Individuals with McArdle's disease has defect 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.
The lipase-mediated release of fatty acids can always be expected to occur when a person is -
correct answer ✔✔running from a bear.
,Which particles transport triacylglycerols to adipose tissue for storage? - correct answer
✔✔Chylomicrons
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. Chose the ONE best
answer. - correct answer ✔✔1 ATP/glucose residue
Order the following steps in glycogen particle synthesis. - correct answer ✔✔1) The
nontransferable activity of glycogen adds UDP-glucose to a tyrosine reside in glycogenin.
2) The glycogen synthase activity of glycogenin forms an alpha-1,4 glycosidic bonds that adds
UDP-glucose to an O-linked glucose residue.
3) The glycogen synthase activity of glycogenin form an alpha-1,4 glycosidic bond that adds
UDP-glucose to an O-linked glucose disaccharide.
4) The glycogen synthase activity of glycogenin used UDP-glucose to extend the chain up to 7
residues.
5) Glycogen synthase used UDP-glucose to form an alpha-1,4 glycosidic bonds that add to the
glycogenin primer.
6) A branching enzyme adds alpha-1,6 linkages.
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
Pork fat has a melting temperature of 40C and flaxseed oil has a melting temperature of -24C.
What contributes to this ~65C difference in melting temperature? Choose the ONE best answer.
, - correct answer ✔✔Pork fat contains 40% more palmitate and sterate, whereas flaxseed oil is
53% alpha-linolenate, the difference in average a melting temperature is about 65C, so it makes
sense.
The role of glycogenin is to - correct answer ✔✔serve as the origin of the glycogen polymer.
What explains the asymmetrical distribution of membrane lipids in the plasma membrane of
animal cells? Choose ONE best answer. - correct answer ✔✔The outer layer contains mostly
sphinoglolipids and the inner layer contains mostly glycerophospholipids because of differential
signaling and fluidity properties.
Which type of phospholipid provides the fatty acid for lecithin-cholesterol acyltransferase to
produce cholesterol esters? - correct answer ✔✔Phosphatidylethanolamine
Which type of fatty acid plays important roles in cell recognition such as in ABO blood groups? -
correct answer ✔✔Gangliosides
Why is less ATP produced from the average carbon in a sugar molecule than from a carbon in a
fat molecule? - correct answer ✔✔The correct answer is not given.
The carbons in fatty acids are a more reduced form of carbon than those in sugars.
Which of the following statements is true concerning ketogenesis? - correct answer ✔✔The
correct answer is not given.
Ketoacidosis is caused by low blood pH due to ketogensis activity producing more ketone bodies
than can be used by the body.
Acetly-CoA and delta-beta-hydroxybutyrate are known as ketone bodies.
already passed
Why is is essential to vigorously agitate dirty clothes with liquid soap in water, why not just let
the soap into the dirt and rinse it off? - correct answer ✔✔Vigorous agitation breaks up the
fatty acids into micelles that are then rinsed away with the dirt inside.
Soaking the dirt with liquid soap does not allow the micelles to form, but rather just coats the
dirt.
Predict the structure of a fatty acid that is trans 16:2 (delta9,11). - correct answer ✔✔H2C-CH2-
CH2-CH2-CH=CH-CH=CH-CH2-CH2-CH2-CH2-CH2-CH2-CH2-COOH
Individuals with McArdle's disease has defect 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.
The lipase-mediated release of fatty acids can always be expected to occur when a person is -
correct answer ✔✔running from a bear.
,Which particles transport triacylglycerols to adipose tissue for storage? - correct answer
✔✔Chylomicrons
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. Chose the ONE best
answer. - correct answer ✔✔1 ATP/glucose residue
Order the following steps in glycogen particle synthesis. - correct answer ✔✔1) The
nontransferable activity of glycogen adds UDP-glucose to a tyrosine reside in glycogenin.
2) The glycogen synthase activity of glycogenin forms an alpha-1,4 glycosidic bonds that adds
UDP-glucose to an O-linked glucose residue.
3) The glycogen synthase activity of glycogenin form an alpha-1,4 glycosidic bond that adds
UDP-glucose to an O-linked glucose disaccharide.
4) The glycogen synthase activity of glycogenin used UDP-glucose to extend the chain up to 7
residues.
5) Glycogen synthase used UDP-glucose to form an alpha-1,4 glycosidic bonds that add to the
glycogenin primer.
6) A branching enzyme adds alpha-1,6 linkages.
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
Pork fat has a melting temperature of 40C and flaxseed oil has a melting temperature of -24C.
What contributes to this ~65C difference in melting temperature? Choose the ONE best answer.
, - correct answer ✔✔Pork fat contains 40% more palmitate and sterate, whereas flaxseed oil is
53% alpha-linolenate, the difference in average a melting temperature is about 65C, so it makes
sense.
The role of glycogenin is to - correct answer ✔✔serve as the origin of the glycogen polymer.
What explains the asymmetrical distribution of membrane lipids in the plasma membrane of
animal cells? Choose ONE best answer. - correct answer ✔✔The outer layer contains mostly
sphinoglolipids and the inner layer contains mostly glycerophospholipids because of differential
signaling and fluidity properties.
Which type of phospholipid provides the fatty acid for lecithin-cholesterol acyltransferase to
produce cholesterol esters? - correct answer ✔✔Phosphatidylethanolamine
Which type of fatty acid plays important roles in cell recognition such as in ABO blood groups? -
correct answer ✔✔Gangliosides
Why is less ATP produced from the average carbon in a sugar molecule than from a carbon in a
fat molecule? - correct answer ✔✔The correct answer is not given.
The carbons in fatty acids are a more reduced form of carbon than those in sugars.
Which of the following statements is true concerning ketogenesis? - correct answer ✔✔The
correct answer is not given.
Ketoacidosis is caused by low blood pH due to ketogensis activity producing more ketone bodies
than can be used by the body.
Acetly-CoA and delta-beta-hydroxybutyrate are known as ketone bodies.
