What is the term given to a group of individuals belonging to the same species that live in a defined geographic area that actually or potentially interbreed?
A) population
B) consanguinity
C) cytogenetics
D) genetics
E) hybrid vigor
Answer: A
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The protoplanet nebula model states that the simplest and most abundant gases would have been
A. hydrogen and helium. B. oxygen and carbon dioxide. C. nitrogen and hydrogen. D. hydrogen and oxygen.
Are any of these vegetables actually fruit?
A. Carrots B. Sugar beets C. Corn D. Celery E. All of these are vegetables, none of them are fruit.
Acyclovir is an antiviral chemical that resembles a nucleotide but lacks a 3' OH group and cannot form phosphodiester bonds. Why is acyclovir useful in treating some viral infections?
A. Acyclovir blocks the assembly of viral cell capsules. B. Acyclovir halts viral DNA replication. C. Acyclovir hydrolyzes viral polysaccharides. D. Acyclovir stops viral protein synthesis.
If a pathogen penetrates nonspecific physical and chemical surface barriers, it breaks through the ________
A) first line of defense B) first and second lines of defense C) second line of defense D) third line of defense