Which of the following types of experimental evidence suggests that a particular organism thought to be part of the human microbiome is, in fact, just a laboratory contaminant?
A. Absence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized
B. Absence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized
C. Presence of ribosomal RNA evidence in a specific host location where the organism was believed to have colonized
D. Presence of ribosomal RNA evidence in a specific host location where the organism was not expected to have colonized
Answer: B
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In the figure, when new viruses are being assembled at the point marked IV, what mediates the assembly?
A) host cell chaperones B) assembly proteins coded for by the host nucleus C) assembly proteins coded for by the viral genes D) viral RNA intermediates E) nothing; they self-assemble
Sympatric speciation occurs
a. before allopatric speciation. b. together with allopatric speciation. c. after allopatric speciation. d. within the home range. e. outside the home range.
Which of the following best represents an adaptation to increase surface-to-volume ratio?
A) the long bones of a giraffe B) the smooth skin of an earthworm C) the multilobed sacs in the lungs D) the striations of skeletal muscle
Which location would best support the growth of a barophile?
A. deep oceans B. acid pools C. salt lakes D. arid desert soil E. hot geyser springs