The phenomenon known as chemotaxis is defined as
A) the squeezing of cells through the lining of capillaries.
B) the release of prostaglandins and leukotrienes in response to microbes.
C) the movement of a cell toward or away from a chemical stimulus.
D) the coating of a pathogen by complement.
E) an increase in allergies and helminth infection.
C
Bloom's Taxonomy: Knowledge
Section: The Body's Second Line of Defense
Learning Outcome: 15.12
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Refer to the accompanying figure. In this sequence of events, the bell is serving as:
a. a motor stimulus. b. the conditioned stimulus. c. a cognition stimulus. d. a sign stimulus. e. the unconditioned stimulus.
Secondary endosymbiosis can occur when a
A) nonphotosynthetic protist engulfs a photosynthetic bacterium. B) virus infects a photosynthetic prokaryote. C) protist evolves to become a prokaryote. D) nonphotosynthetic protist engulfs a photosynthetic protist. E) green alga engulfs a photosynthetic bacterium.
Often, the first organisms to colonize a new environment are ________
Fill in the blank(s) with correct word
Systematists often use DNA sequencing in ________, the study of the order of evolutionary events within a group sharing derived characters.
Fill in the blank(s) with the appropriate word(s).