All of the following are true regarding systematics EXCEPT that it
A. is the study of the diversity of organisms at all levels of organization.
B. relies on data from the fossil record, homology, and molecular data.
C. is the specific study of identification, naming, and classification of organisms.
D. utilizes protein, DNA, and RNA comparisons to determine relatedness of individuals.
Answer: C
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Type III hypersensitivity conditions such as arthritis involve
A. the formation of immune complexes. B. delayed, cell-mediated immune reactions. C. a cytotoxic reaction. D. the activation of mast cells. E. All of the choices are correct.
Type ________ hypersensitivity is generally called a cytolytic or cytotoxic reaction because it results in the destruction of host cells, either by lysis or toxic mediators.
Fill in the blank(s) with the appropriate word(s).
Which association between zone and description is NOT correct?
A. benthic - stream, lake, or ocean floor B. bathypelagic - sunlit portion of the ocean C. limnetic - lake zone on surface away from shore D. littoral - lake zone closest to shore
You are a virologist interested in studying the evolution of viral genomes. You are studying two newly isolated viral strains and have sequenced their genomes. You find that the genome of strain 1 contains 25% A, 55% G, 20% C, and 10% T
You report that you have isolated a virus with a single-stranded DNA genome. Based on what evidence can you make this conclusion? (a) single-stranded genomes always have a large percentage of purines (b) using the formula: G – A = C + T (c) Double-stranded genomes have equal amounts of A and T (d) Single-stranded genomes have a higher rate of mutation