The fimbriae of Neisseria gonorrhea and enteropathogenic E. coli are examples of
A) adhesins.
B) ligands.
C) receptors.
D) adhesins and ligands.
E) adhesins, ligands, and receptors.
D
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A dikaryotic cell
a. is a spore. b. results from nuclear fusion. c. contains nuclei of two different mating types. d. becomes a zygote. e. becomes a gamete
The umbilical cord functions to
a. carry waste products in the blood from the fetus to the mother. b. carry waste products in the blood from the mother to the fetus. c. carry oxygen in the blood from the mother to the fetus. d. do both a and c.
The technique called (northern/Southern/western) blotting is useful for using probes to identify specific DNA fragments that have been separated by electrophoresis
What will be an ideal response?
During the observations of a species of blue moon butterflies on the Samoan islands of Upolu and Savaii,
99% of the butterflies were originally female and only 1% were male but in only five years the male:female sex ratio had returned to nearly the expected 1:1. What caused this? a. The tendency for Wolbachia to kill male butterflies changed. b. Evolutionary changes in the butterflies allowed the butterflies to suppress the male-killing ef-fect of Wolbachia. c. A and B. d. Neither A nor B.