The electrical signal for a muscle to contract passes rapidly from one cell to the next via
A) gap junctions.
B) desmosomes.
C) plasmodesmata.
D) tight junctions.
E) internal proteins.
A
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While walking along the beach at Point Lobos, California, the fellow pictured walks up to you with algae in hand. Figuring you to be a college student who has probably had a good introductory biology course, he asks if you know what it is.
(a) What is the cell wall component of the organism that has commercial value? (b) Name three uses for that cell wall component.
Which of the following viral diseases has been acquired in the United States by handling pet prairie dogs?
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A positive (susceptible) reaction for the ______________ test is ______________.
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Prevotella is involved in almost all cases of which of the following?
A) Ear infections B) Brain abscesses C) Periodontal infections D) Sinus infections