The human body may stop responding to a stimulus even though the original stimulus is still present; this is a process referred to as receptor adaptation.
Answer the following statement(s) true (T) or false (F)
Answer: True
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Pentameric IgM activates complement up to 20-fold more effectively than does the hexameric form of IgM.
Answer the following statement true (T) or false (F)
What are the phases of mitosis in the correct order?
a. prophase, telophase, prometaphase, metaphase, anaphase b. metaphase, prometaphase anaphase, telophase, prophase c. prophase, prometaphase, metaphase, anaphase, telophase d. prometaphase, metaphase, prophase, anaphase, telophase
One strain of rII- phage has a deletion in the rII region, another has a point mutation in the rII region. When E. coli K(?) cells are infected with either rII- phage (not both) no plaques form. When E. coli K(?) cells are infected with both rII- phage simultaneously plaques do form. Why do plaques form when E. coli K(?) cells are infected with both types of rII- phage simultaneously?
A) Recombination between the two phage genomes resulted in a wild-type phage. B) The two phage have mutations in different rII genes and their genomes complement each other. C) A protein made by the deletion phage can repair the DNA of the phage with the point mutation. D) Bacteria can survive infection with one phage, but they cannot survive infection with two phages.
In biology lab, your instructor informs you that carbon-14 dating will demonstrate the use of determining the age of a fossil. Using only this information, you estimate that the age of the fossil must be less than about years old.
A. 75,000 B. 1.3 billion C. 40,000 D. 100,000 E. 300,000