Which of the following structures contains the greatest amount of cholesterol? A

Question

Which of the following structures contains the greatest amount of cholesterol? A) Mitochondrial membrane of animal cells. B) Plasma membrane of animal cells. c) Mitochondrial membrane of bacteria. D) Plasma membrane of animal bacteria. E) All of the above structures contain similar amount of cholesterol. What is the phospholipid to protein ratio in the E coli cell membrane? A) 4:1 B) 3:1 C) 1:3 D) 1:4 E) Answer cannot be determined from the information given. Which of the following statements regarding the plasma membrane is false? A) Different organisms have different membrane lipid composition. B) Different tissues of a given organism have different membrane lipid composition. C) Different organelles of given cell have different membrane lipid composition. D) In general, the plasma membrane contains phospholipids than proteins. E) In general, the plasma membrane contains more phospholipids than sterols.

Explanation / Answer

Answer:

1) Which of the following structures contains the greatest amount of cholesterol?

A) mitochondrial membrane of animal cells

B) Plasma membrane of animal cells - Correct Answer (Cholesterol is an essential component of animal cell's plasma membrane and plays an important role in maintaining membrane fluidity, Bacterial cells don't contain Cholesterol but similar compounds called as Hoponoids)

C) Mitochondrial membrane of bacteria

D) Plasma membrane of bacteria

E) All of the above structures contains similar amount of cholesterol

2) What is the phospholipid to protein ratio in E.coli cell membrane?

A) 4:1

B) 3:1

C) 1:3 - Correct Answer (Phospholipid to protein ratio in E.coli cell is 25 :75 (% by weight) or 1:3

D) 1:4

E) Answer cannot be determined from the information given

16) Which of the following statements regarding the plasma membrane is false?

A) Different organisms have different membrane lipid composition

B) Different tissues of a given organism have different membrane lipid composition.

C) In general, the plasma membrane contains more phospholipids than proteins - FALSE (based on the table it can be seen that in general, in different organisms, the protein content is more than the phospholipid content)

D) In general, the plasma membrane contains more phospholipids than sterols

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