A marine biologist makes a presentation about crustaceans to your biology class. He explains that he has recently received an NSF grant to study sessile crustaceans. You are only aware of one group of sessile crustaceans. This crustacean must be
A. a barnacle.
B. a crayfish.
C. a shrimp.
D. a lobster.
E. the nauplius.
Answer: A
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Phagocytosis of microbes by macrophages is enhanced by _____
I) the binding of antibodies to the surface of microbes II) antibody-mediated agglutination of microbes III) the release of cytokines by activated B cells A) only I and II B) only II and III C) only I and III D) I, II, and, III
Suppose a DNA replication error is not corrected. After two cell divisions, how many of the four daughter cells
contain this mutation (assuming that the mistake was never corrected)?
a. noneb. one c. two d. three e. four
Although there are other classification schemes for prokaryotes, the one used in Bergey's Manual is currently considered by most microbiologists to be the most accurate.
Answer the following statement true (T) or false (F)
When is a cell in metaphase?
a. The chromosomes are visible as threadlike structures. b. The nuclear envelope is clearly visible. c. The chromosomes are aligned at the midplane of the cell. d. The chromosome are separated into distinct groups at opposite poles of the cell. e. Cytokinesis is occurring