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
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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
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
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
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.