Unlike bacteria, viruses:

A) are unable to replicate.
B) are treated effectively with antibiotics.
C) do not produce an immune response.
D) do not produce exotoxins or endotoxins.


Answer: D) do not produce exotoxins or endotoxins.

Biology & Microbiology

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Bacteria that cause tooth decay can lead to ____

a. diarrhea b. constipation c. hepatitis d. gingivitis e. gastritis

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If a trait is X-linked recessive, who would express the trait?

A) females homozygous for the dominant allele and males hemizygous for the recessive allele B) heterozygous females and males hemizygous for the dominant allele C) females homozygous for the recessive allele and males hemizygous for the recessive allele D) females homozygous for the recessive allele and males hemizygous for the dominant allele E) the same proportions of females and males

Biology & Microbiology

Guppies from Trinidad form two distinct populations that differ in several life history traits. These traits appear to relate to the local predator populations, pike-cichlids or killifish. Which experiments would best test the heritability of these

traits? A) Raise both populations with cichlids to see if the population of smaller, faster-maturing guppies reproduces more quickly. B) Raise both populations without predators to see if they maintain their life history traits. C) Introduce cichlids into a habitat with killifish. D) Provide additional food to the guppies from cichlid habitats to see if they will grow to the same size as guppies from the killifish habitat.

Biology & Microbiology

Old pine stumps are dug up, split into pieces and sold as "fatwood." Fatwood is used as a fire starter. Why is this done?

A. The high concentration of volatile organic compounds makes the wood flammable. B. Pine bark does not absorb water and is flammable. C. The wood in the stumps is porous and dry, thus it burns easily.

Biology & Microbiology