The capsule, which is a virulence factor, causes which of the following consequences?
A. Phagocytic escape
B. Activation of cytokine production
C. Attachment to phagocytes
D. Invasion
Answer: A. Phagocytic escape
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Receptor mediated endocytosis
A. involves formation of caveolae that are enriched in cholesterol and caveolin. B. depends on formation of clathrin coated pits that pinch off. C. depends on formation of clathrin coated pits that pinch off and is used to internalize molecules such as hormones, growth factors, iron, and cholesterol. D. is used to internalize molecules such as hormones, growth factors, iron, and cholesterol. E. is typically used to internalize plasma membranes added by exocytosis.
Which of the following sub-disciplines of
biology focuses on understanding the entire genetic composition of organisms?
a. evolutionary biology b. molecular biology c. genomics d. comparative anatomy e. embryology
Habituation is a form of learning in which the subject:
a. continuously produces a certain kind of behavior in the presence of sign stimulus b. fails to make a response when the sign stimulus is presented for the first time c. produces fewer responses to a stimulus that is repeated several times in succession. d. strongly reacts to a stimulus when it is presented after a long period of time has passed
What is the effect of a beta-barrel on the permeability of a membrane?
a. It decreases permeability. b. It increases permeability. c. It has no effect. d. beta-barrels are never found in membranes.