Water-soluble (lipid-insoluble) ions have to be smaller than what diameter in order to use protein channels for passage across the membrane?
a. 0.1 nm
b. 0.4 nm
c. 0.8 nm
d. 1 nm
e. 8 nm
(
Question 2) Coatomers form around endosomes formed during receptor-mediated endocytosis.
Indicate whether the statement is true or false
(
Question 3) Two properties of particles influence whether they can permeate the plasma membrane without assistance: ____.
a. size and the relative solubility of the particle in lipid
b. size and the relative solubility of the particle in water
c. shape and the relative solubility of the particle in water
d. shape and size
e. electrical charge and shape
(
Question 4) The only time the contents of secretory vesicles come in contact with the cytosol is when the vesicle joins with the plasma membrane.
Indicate whether the statement is true or false
(
Question 5) In terms of plasma membrane transport, which descriptor is the most accurate?
a. permeable
b. selectively permeable
c. non-permeable
d. porous
e. sealed
(
Question 6) Since lysosomes cannot make their own enzymes, those enzymes must be synthesized in the Golgi complex prior to the lysosome's formation.
Indicate whether the statement is true or false
(
Question 7) Gap junctions are especially abundant in what kind of tissue?
a. nerves
b. tendons
c. cardiac muscle and smooth muscle
d. brain tissue
e. fingernails
(
Question 8) Peroxisomes arise from vesicles produced at the rough ER, while lysosomes arise from vesicles produced at the Golgi complex.
Indicate whether the statement is true or false
(
Question 9) What kind of junctions are impermeable junctions that join the lateral edges of epithelial cells near their luminal borders, thus preventing movement of materials between the cells?
a. gap junctions
b. desmosomes
c. luminal junctions
d. plasma junctions
e. tight junctions
(
Question 10) The amount of smooth ER within liver cells may change dramatically over a period of days, depending on the amount of drug detoxification that is required.
Indicate whether the statement is true or false
Quick Reply
