Which of the following is incorrect about complement?
A. It involves an alternate pathway.
B. It involves a classical pathway.
C. It is composed of at least 20 blood proteins.
D. It only appears in the blood during a response to a pathogen.
E. It acts in a cascade reaction.
Answer: D
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The substantial reduction of the total population of microorganisms on inanimate objects and the destruction of potential pathogen is called
A. antisepsis. B. sanitization. C. disinfection. D. sterilization.
When two pairs of homologous chromosomes join for crossing-over, the complex is called a ____
a. kinetochore b. centromere c. sister chromatid d. tetrad e. chiasmata
Which are nursery grounds for shrimp and
many invertebrates and fish? a. photic zones b. benthic zones c. estuaries d. pelagic zones e. limnetic areas
In Figure 23-2, the taxon labeled II is:
a. monophyletic. b. paraphyletic. c. polyphyletic. d. a clade. e. an outgroup