Consider a community in which the vaccination rate for measles is 99 percent. Ryan, a 2-year-old with leukemia, has not received the measles vaccination because of his immunocompromised status. Ryan is unlikely to get measles because
A. the measles virus does not typically affect children with leukemia.
B. measles has been completely eradicated and is no longer a threat.
C. there is substantial herd immunity in his community.
D. he is protected by antibodies from his mother that crossed the placenta.
Answer: C
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A mycobiont, the fungal partner in a lichen, makes up about 10% of the vegetative body resulting from an association
between a fungus and a photosynthetic partner.
a. True b. False
To see in dim light, ____ are most needed
a. rods b. blue cones only c. green cones only d. red cones only e. both red and green cones
Which of the following types of evidence supports the multiregional model for human evolution?
1.genetic markers on the Y chromosome 2.fossil evidence 3.mitochondrial DNA 4.microsatellite data 5.autosomal gene sequences
The advent of recombinant DNA technology made the sequencing of genomes possible
a. True b. False