Antiviral drugs are often difficult to develop, largely because
A. viruses are more abundant in the body than bacterial cells.
B. viruses are obligate intracellular parasites so the drugs must enter the host cell and often cause toxic side effects in order to destroy the virus.
C. viruses are more pathogenic than bacterial cells.
D. viruses are much smaller than bacterial cells.
Answer: B
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Two snapdragons heterozygous for alleles that encode red and white flower color are crossed. If the red and white
alleles show incomplete dominance, what will be the ratios of phenotypes in the offspring?
a. 100% pink b. 100% red c. 50% white, 50% red d. 25% red, 50% pink, 25% white e. 25% pink, 50% white, 25% red
Evolution of the eyes into a forward-directed position allowed for better
a. detection of shapes in three dimensions. b. detection of movements in three dimensions. c. response to variations in color. d. response to variations in light intensity. e. all of these.
Are any of these vegetables actually fruit?
A. Sugar beets B. Corn C. Celery D. Carrots E. All of these are vegetables; none of them are fruit.
Place these events in the pathogenesis of contact dermatitis in order, with 1 being the first step.Sensitized T lymphocytes recognize the antigen and make cytokine chemicals.Cytokine chemicals attract macrophages, dendritic cells, and cytotoxic T lymphocytes to the site of the antigen.Chemicals are released from phagocytic cells and cytotoxic T cells, resulting in host tissue damage.A chemical is absorbed through the skin. The antigen is identified by a dendritic cell.
What will be an ideal response?