Structure & Function of Biological Membranes

Question 1

Membrane thickness is about
a. 5μm
b. 0.5Å
c. 50nm
d. 0.5μm
e. 5nm

Answer 1

e

Question 2

All phospholipids have a glycerol backbone except
a. Phosphatidylcholine
b. Ceramide
c. Phosphatidylethanolamine
d. Sphingomyelin
e. Sphingosine

Answer 2

d

Question 3

Tocopherol is a
a. hormone
b. vitamin
c. bile acid
d. energy store
e. membrane lipid

Answer 3

b

Question 4

For a fatty acid labelled (18:1Δ9) there is a double bond at
a. carbon 1 from the methyl end
b. carbon 9 from the carboxylate end
c. carbon 9 from the methyl end
d. carbon 4 (Δ) from the methyl end and 9 from the carboxylate end
e. carbon 4 (Δ) from the methyl end

Answer 4

b - FATTY ACIDS ARE LABELLED FROM THE CARBOXYLATE END!!

Question 5

Cholesterol is
a. hydrophobic
b. hydrophilic
c. amphipathic
d. amphihydric
e. lipopathic

Answer 5

c

Question 6

One example of a membrane ion channel is
a. GLUT-1
b. adenylyl cyclase
c. spectrin
d. actin
e. GABAA

Answer 6

e

Question 7

An example of an anchored membrane protein is
a. Ras
b. Raf
c. protein kinase A
d. adenylyl cyclase
e. phospholipase A2

Answer 7

a

Question 8

Phopholipase C cleaves the bond within phospholipids between
a. carbons 2 and 3 of the glycerol molecule
b. the phosphate group and the head group
c. the glycerol molecule and the first fatty acid chain
d. the glycerol molecule and the phosphate group
e. the glycerol molecule and the second fatty acid chain

Answer 8

d