Koch's postulates include all the following except:a
when a sample of a pure culture is injected into a healthy host, it causes the same disease.
b. a sample of the microorganism from a diseased host can be grown in pure culture.
c. the microorganism can be recovered from an experimentally infected host.
d. the microorganism must be visible in the electron microscope.
e. the pathogen must be present in every individual with the disease.
D
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Organisms that obtain energy and nutrients by eating either living or dead organisms are called
A. producers. B. All of the answer choices are correct. C. autotrophs. D. consumers. E. plants.
What is the function of a gizzard as found in
earthworms and other animals?
a. stores food b. entrance for food c. absorbs nutrients d. grinds food e. exit for waste
Which of the following processes is involved in the "central dogma" of genetics?
A) translation only B) transcription only C) DNA replication only D) transcription and translation E) DNA replication and translation
Which of the following is NOT a characteristic of pUC19's usefulness as a cloning vector?
a. ampicillin resistance for selection b. easily screenable insertion c. large size d. multiple cloning site