The term membrane potential refers to a separation of opposite charges across the membrane.
a. True
b. False
Indicate whether the statement is true or false
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Question 2) The plasma membrane
a. appears under an electron microscope as a double dark line with a light space between
b. is composed primarily of a double layer of protein molecules with cholesterol molecules interspersed between them
c. has a hydrophilic region between two hydrophobic regions
d. has all of the above characteristics
e. does not exhibit any of the above characteristics
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Question 3) Materials packaged for export by the endoplasmic reticulum and Golgi complex are externalized by exocytosis.
a. True
b. False
Indicate whether the statement is true or false
(
Question 4) Which statement about the plasma membrane is true?
a. It appears trilaminar under a light microscope.
b. Its glycocalyx serves as receptor sites for binding chemical messengers in the ECF.
c. It is impermeable to lipid-soluble substances.
d. Some of its carriers transport ions.
e. Its channels are impermeable to any substance smaller than 0.8 nm in diameter.
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Question 5) In secondary active transport, energy is used directly in the entire process.
a. True
b. False
Indicate whether the statement is true or false
(
Question 6) A single phospholipid in the plasma membrane
a. has its hydrophobic end next to either the ECF or the cytosol
b. spans the entire width of the membrane
c. can function as carrier molecule
d. remains in the same location indefinitely
e. does not exhibit any of the above characteristics
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Question 7) Saturation of carriers is a critical rate-limiting factor in the transport of selected substances across the kidney membranes during urine formation.
a. True
b. False
Indicate whether the statement is true or false
(
Question 8) Describe the structure and function of cilia and flagella. Be sure to include the following in your answer : basal body, doublets, triplets, dynein, fused, unfused, and 9+2.
What will be an ideal response?
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Question 9) Membrane channels can be open or closed, but carriers are always open for business..
a. True
b. False
Indicate whether the statement is true or false
(
Question 10) Describe the movement of vesicles along microtubules in the cytoskeleton. Include the following in your answer : microtubules, tubulin, kinesin, dynein, plus end, minus end, and centriole.
What will be an ideal response?
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