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Exam 3 Solved - Principles of Biochemistry - Fall 2010 | BCH 4013, Exams of Biology

Mississippi State University (MSU)Biology
Prof. Jiaxu Li

is sand called sand because its near the sea and the land? Material Type: Exam; Professor: Li; Class: Principles of Biochemistry; Subject: Biochemistry; University: Mississippi State University;

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BCH 4013/6013 Exam 3 (11/04/2010)
There are 50 questions worth 0.4 points each (total 20 points)
1. Which of the following lipids is used for energy storage?
A) glycolipids
B) glycerophospholipids
C) sphingolipids
D) triacylglycerols
2. Compared to vegetable oil, beef fat is has a higher proportion of
A) long-chain unsaturated fatty acids
B) long-chain saturated fatty acids
C) short-chain unsaturated fatty acids
D) short-chain saturated fatty acids
3. Which of the following is true for biological membranes?
A) membranes are lipid bilayers.
B) membrane lipids have both hydrophobic and hydrophilic properties.
C) all of the above.
D) none of the above.
4. The fluidity of the lipid in the interior of a bilayer is generally increased by:
A) a decrease in temperature
B) an increase in fatty acyl chain length
C) an increase in the number of double bonds in fatty acids
D) the binding of water to the fatty acyl side chains
5. Lipid molecules are said to be amphipathic, when
A) they have asymmetric carbons and can exist in left- and right-handed forms.
B) they have a dual nature with part of the molecule being hydrophobic (unpolar) and the
other part hydrophilic (polar).
C) they are capable of moving out from a lipid bilayer.
6. Triacylglycerols are NOT found in cell membranes because they are
A) charged at biological pH
B) not abundant in cells
C) not amphipathic
D) amphipathic
7. Integral membrane proteins are proteins that
A) penetrate or span the membrane
B) loosely associated with the membrane
C) can be released from the membrane by changing the pH
D) can be released from the membrane by changing the ionic strength
8. Facilitated diffusion (passive transport) through a biological membrane is
A) driven by ATP hydrolysis
B) driven by the movement of lipids
C) driven by a concentration gradient
D) endergonic
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Download Exam 3 Solved - Principles of Biochemistry - Fall 2010 | BCH 4013 and more Exams Biology in PDF only on Docsity!

BCH 4013/6013 Exam 3 (11/04/2010)

There are 50 questions worth 0.4 points each (total 20 points)

  1. Which of the following lipids is used for energy storage? A) glycolipids B) glycerophospholipids C) sphingolipids D) triacylglycerols
  2. Compared to vegetable oil, beef fat is has a higher proportion of A) long-chain unsaturated fatty acids B) long-chain saturated fatty acids C) short-chain unsaturated fatty acids D) short-chain saturated fatty acids
  3. Which of the following is true for biological membranes? A) membranes are lipid bilayers. B) membrane lipids have both hydrophobic and hydrophilic properties. C) all of the above. D) none of the above.
  4. The fluidity of the lipid in the interior of a bilayer is generally increased by: A) a decrease in temperature B) an increase in fatty acyl chain length C) an increase in the number of double bonds in fatty acids D) the binding of water to the fatty acyl side chains
  5. Lipid molecules are said to be amphipathic, when A) they have asymmetric carbons and can exist in left- and right-handed forms. B) they have a dual nature with part of the molecule being hydrophobic (unpolar) and the other part hydrophilic (polar). C) they are capable of moving out from a lipid bilayer.
  6. Triacylglycerols are NOT found in cell membranes because they are A) charged at biological pH B) not abundant in cells C) not amphipathic D) amphipathic
  7. Integral membrane proteins are proteins that A) penetrate or span the membrane B) loosely associated with the membrane C) can be released from the membrane by changing the pH D) can be released from the membrane by changing the ionic strength
  8. Facilitated diffusion (passive transport) through a biological membrane is A) driven by ATP hydrolysis B) driven by the movement of lipids C) driven by a concentration gradient D) endergonic
  1. Which of the following transport processes requires no energy? A) Facilitated diffusion B) Primary active transport C) Secondary active transport
  2. Which of the following is NOT TRUE regarding the oxidation of fatty acids by the β- oxidation pathway? A) the reactions produce acetyl-CoA. B) the reactions DO NOT produce FADH2. C) the reactions produce NADH. D) the reactions occur in the mitochondria.
  3. In animal cells, where does fatty acid synthesis occur? A) in lysosome B) in the nucleus C) in mitochondria D) in the cytosol
  4. Fatty acids are activated to acyl-CoAs and the acyl group is further transferred to carnitine BECAUSE : A) acyl-carnitines readily cross the mitochondrial inner membrane, but acyl-CoAs do not. B) acyl-CoAs easily cross the mitochondrial membrane, but the fatty acids themselves will not. C) carnitine is required to oxidize NAD

to NADH.

  1. Fatty acids are oxidized in the ______. A) mitochondrial matrix B) cytosol C) endoplasmic reticulum D) nucleus
  2. Which of the following compounds serves to transport excess ammonia from muscle to liver for urea synthesis? A) alanine B) aspartic acid C) glycine D) serine
  3. Which of the following best defines an essential amino acid? A) an amino acid that cannot be made de novo by humans and must be obtained in the diet B) an amino acid that can be made by human C) all of the above is correct D) both A and B are correct
  4. At the subcellular level where does the urea cycle occur? A) mitochondrial matrix only B) mitochondrial matrix and the cytosol C) cytosol and nucleus D) cytosol only
  1. Which two amino acids serve as the primary nitrogen donors for the biosynthesis of the other amino acids? A) Aspartate and alanine B) Aspartate and asparagine C) Glutamate and glutamine D) Serine and glycine
  2. Enzymes that digest the triacylglycerols into free fatty acids and monoacylglycerol are called A) hydrases B) glyases C) lipases D) all of the above
  3. Cholesterol is not oxidized for energy within the body, but you might help eliminate it from your body if you could increase the formation of: A) Triacylglycerols B) Bile salts C) Mineralocorticoids D) Protein hormones
  4. How many rounds of β oxidation would be required for a 16-C fatty acyl chain to be degraded to acetyl-CoA? A) 16 B) 8 C) 7 D) none of the above
  5. The conversion of palmitoyl-CoA (16:0) to myristoyl-CoA (14:0) and 1 mol of acetyl-CoA by the beta-oxidation pathway results in the net formation of: A) 1 FADH 2 and 1 NADH B) 1 FADH 2 and 1 NADPH C) 1 FADH 2 , 1 NADH, and 1 ATP D) 2 FADH 2 and 2 NADH
  6. Free fatty acids in the bloodstream are: A) bound to hemoglobin B) carried by the protein serum albumin C) freely soluble in the aqueous phase of the blood D) nonexistent; the blood does not contain fatty acids
  7. Cholesterol is synthesized from: A) acetyl-CoA B) choline C) lipoic acid D) malate
  8. Which types of amino acids are ketogenic? A) those that are degraded to pyruvate. B) those that are degraded to acetyl-CoA.
  1. Glutamate can be synthesized directly from: A) oxaloacetate B) citrate C) α-ketoglutarate
  2. Nonessential amino acids: A) are synthesized by plants and bacteria, but not by humans. B) can be synthesized in humans.
  3. If a person's urine contains unusually high concentrations of urea, which one of the following diets has he or she probably been eating recently? A) High carbohydrate, very low protein B) Very high fat, very low protein C) Very low carbohydrate, very high protein

37. The drug called lovastatin is now used to decrease plasma cholesterol levels by

inhibiting the rate-limiting step of cholesterol synthesis. This step is catalyzed by:

A) HMG-CoA synthase B) HMG-CoA reductase C) thiolase D) acetyl-CoA carboxylase

  1. Each of the following statements are true for lipoproteins, EXCEPT. A) Lipoproteins are complexes of lipid and protein which are necessary for lipid transport in the blood. B) Atherosclerosis is not linked to high levels of LDL-bound cholesterol. C) Low density lipoproteins carry cholesterol and cholesterol esters.
  2. Which of the following statements about cholesterol is FALSE? A) Plant-based foods contain cholesterol. B) Cholesterol can be metabolized to bile acids. C) Cholesterol can be converted to cholesteryl ester for storage. D) Cholesterol is an essential component of all animal cell membranes.
  3. Triacylglycerols contain three fatty acid molecules esterified to the three hydroxyl groups of A) glycerol B) sphingasine C) pyruvate D) alanine
  4. The principal site of cholesterol synthesis is: A) The liver B) The ovaries C) The testes D) The intestines
  5. In steady-state metabolism: A) The rates of catabolism far exceed the rates of anabolism B) The rate of anabolism exceeds the rate of catabolism C) A balance exists between rates of anabolism and catabolism

Answer Key to Exam 3

  1. D
  2. B
  3. C
  4. C
  5. B
  6. C
  7. A
  8. C
  9. A
  10. B
  11. D
  12. A
  13. A
  14. A
  15. A
  16. B
  17. C
  18. C
  19. C
  20. A
  21. B
  22. A
  23. B
  24. B
  25. C
  26. C
  27. C
  28. B
  29. C
  30. A
  31. B
  32. A
  33. B
  34. C
  35. B
  36. C
  37. B
  38. B
  39. A
  40. A
  41. A
  42. C
  43. A
  44. C
  45. C
  46. D
  47. A
  48. B
  49. D
  50. B