Viral infections are difficult to treat because the drugs that attack viral replication also cause serious side effects in the host.

a. true
b. false


Answer: a. true

Biology & Microbiology

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Which of the following statements about natural selection are true?

A) Directional selection occurs when one extreme phenotype in the population is favored. B) Stabilizing selection favors all phenotypes equally. C) Disruptive selection favors two extreme phenotypes. D) Directional selection is most common in stable environments.

Biology & Microbiology

An allele of the pea color gene specifies the enzyme Sgr, which normally functions in a pathway to break down chlorophyll during pea maturation, resulting in yellow mature peas. A second allele of the Sgr gene produces no enzyme and is the ________ allele.

A) dominant B) recessive C) wild-type D) functioning

Biology & Microbiology

During bacterial conjugation, bacterial DNA with different alleles are transferred. Bacteria use a long

tubular structure called a ____ to obtain differing alleles.

a. metabolic pilus b. asexual pilus c. flagellum d. cilia e. sex pilus

Biology & Microbiology

In lab, you are asked to label the parts of a sperm cell model. Which of the following would not be observed on the model?

A. flagellum B. cilia C. nucleus D. acrosome E. mitochondrion

Biology & Microbiology