carbons 31. which of the following would yield the most highly mobile phospholip

Question

carbons 31. which of the following would yield the most highly mobile phospholipid (listed as number of and number of double bonds, respectively)? A) 24 carbons with 1 double bond B) 15 carbons with 2 double bonds C) 20 carbons with 2 double bonds D) 16 carbons with no double bonds 32. The enzymes that add the sugars to the lipids to generate the glycolipid the s are confined to the inside of A) Endoplasmic reticulum C) Cytosol B) Golgi apparatus D) Plasma membrane 33. Which of the statements is true about coupled transport? A) It requires ATP B) It relies on light as an energy source. C) It can be either symport or antiport. D) It is a form of passive transport. 34. When glucose is transported from the lumen of the gut through a gut epithelial cell, what form of transport is occurring at the apical surface of the cell? A) Glucose driven sodium symport B) Sodium driven glucose symport C) Passive transport of glucose D) Sodium driven glucose antiport 35. What happens immediately after the sodium (Nat) potassium (Kt) pump hydrolyzes ATP? A) Sodium is bound. B) ADP is bound. C) The pump is phosphorylated. D) The pump changes conformation. - 36. What prevents the action potential that is moving down an axon from returning to the cell body? A) There are insulatory barriers called the nodes of ranvier that prevent backwards propagation. B) The concentration of ions is not sufficient to cause a backward flow up the gradient. C) An inactive state of the sodium channel prevents the backward flow of the action potential. D) The membrane potential closed to the cell body is more negative due to influx of Cr. 37. Although the extracellular environment has a high sodium ion concentration and the intracellular environment has a high potassium ion concentration, both must be neutralized by negatively charged molecules. In the extracellular case, what is the principal anion? A) HCO3 C) PO43- B) C - D) OH 38. A hungry yeast cell lands in a vat of grape juice and begins to feast on the sugars there, producing carbon dioxide and ethanol in the process: C6H12O6 + 2ADP + 2Pi + H+ 2CO2 + 2CH3CH20H + 2ATP + 2H2O Unfortunately, the grape juice is contaminated with proteases that attack some of the transport proteins in the yeast cell membrane, and the yeast cell dies. Which of the following could account for the yeast cell's demise? A) toxic buildup of carbon dioxide inside the cell B) toxic buildup of ethanol inside the cell

Explanation / Answer

31) B. 15carbons and 2 double bond will increase the fluidity of plasma membrane, as fatty acids with shorter chain length and double bonds increases fluidity.

32) A. Endoplasmic reticulim.

33) C. Coupled transport can be either symport or antiport

34) B.Sodium drive glucose symport

35) C. Pump is phosphorylated

36) C An inactive state of sodium ion channel prevents the backflow of action potential.

37) B. Cl-

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