How can signal molecules remain outside of cells but still create changes in activity inside cells?
A. Signal molecules act via plasmolysis.
B. Signal molecules bind to specific receptor proteins on the outside surface of the plasma membrane. This triggers a chain reaction of events that passes the signal to molecules inside the cell.
C. Active transport is required for signal molecules to transmit their signals.
D. Signal molecules act through exocytosis.
B. Signal molecules bind to specific receptor proteins on the outside surface of the plasma membrane. This triggers a chain reaction of events that passes the signal to molecules inside the cell.
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Some disease leave ____ in the form of long-term or permanent damage to tissues or organs after the course of the infection
a. symptoms b. granular tissue c. signs d. sequelae
The interaction between two organisms, called commensalism,
A. always benefits one of the organisms and does not affect the other. B. does not fit either of the definitions of symbiosis. C. is illustrated by the relationship between the shark and the fish that it eats. D. includes all of these statements.
Which of the following bacterial diseases is not caused by an anaerobe?
A) botulism B) gas gangrene C) tetanus D) tularemia
The activity of which of the following digestive enzymes will be affected by the regular consumption of antacids following a meal?
A) Amylase B) Sucrase C) Pepsin D) Lipase E) Cellulase