While foraging on grass, white-tailed deer occasionally ingest snails or slugs that host larvae of the meningeal worm. The worm larvae mature inside the deer and eventually are passed out with the feces
The snails acquire the larvae as they come into contact with deer feces on the ground. The snails are an example of a(n) A) intermediate host.
B) direct host.
C) definitive host.
D) macrohost.
A
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Which of the following describes the purpose of the polymerase chain reaction?
a. increasing the number of copies of DNA b. separating charged molecules by size and charge c. opening cells to extract DNA in a gelatinous mass d. cutting DNA sequences in a predictable manner
In the figure, the dots in the space between the two structures represent which of the following?
A) receptor molecules B) signal transducers C) neurotransmitters D) hormones E) pheromones
Human growth hormone (HGH) can be used to treat patients with pituitary dwarfism. Today, parents are getting HGH injections for their children to provide an advantage in sports or to enhance their appearance by making them taller. Based on what you know
about the process of bone lengthening, what is the most appropriate age group to begin such injections? A) 7- to 10-year-olds B) 18- to 21-year-olds C) 21- to 30-year-olds D) 3- to 6-year-olds
Members of the Enterobacteriaceae can be distinguished from each other by
A) the presence or absence of the enzyme oxidase. B) the ability to ferment lactose. C) motility. D) both motility and the presence or absence of the enzyme oxidase. E) both motility and the ability to ferment lactose.