Which of the following summarizes the Hardy-Weinberg principle?

a. Without evolutionary forces, a population’s allele frequencies are stable.
b. Traits are acquired through use or disuse and passed to offspring.
c. Due to microevolution, the population’s genetic structure is changing.
d. Natural selection impacts the genetic makeup of a population.


a. Without evolutionary forces, a population’s allele frequencies are stable.

Biology & Microbiology

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What will be an ideal response?

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a. intracellular pathogens b. extracellular pathogens c. cancerous cells d. both intracellular pathogens and extracellular pathogens e. both intracellular pathogens and cancerous cells f. intracellular pathogens, extracellular pathogens, and cancerous cells

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Cells called ______________ release chemicals that kill bacteria and everything else in an area, including themselves.

A. monocytes B. macrophages C. basophils D. neutrophils

Biology & Microbiology

Which of the following statements best describes Helicobacter pylori?

A) It is a gram-positive coccus that causes skin infections. B) It is a gram-negative spiral that causes ulcers. C) It lacks a cell wall and produces a lot of acid. D) It can be detected by testing for cold agglutinins.

Biology & Microbiology