People with sickle-cell trait
A) are heterozygous for the sickle-cell allele.
B) are usually healthy.
C) have increased resistance to malaria.
D) produce normal and abnormal hemoglobin.
E) all of the above
Ans: E) all of the above
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. A bell-shaped curve of phenotypic variation is indicative of
a. incomplete dominance. b. continuous variation. c. multiple alleles. d. epistasis. e. environmental variables on phenotypes.
The boreal forests of North America are dominated by ____
a. spruce, fir, and pine b. redwoods and sequoia c. birch and aspen d. long-leaf and loblolly pines e. cedars and junipers
©McGraw-Hill EducationA frog should be added to the phylogeny above at point
A. A. B. B. C. C. D. D. E. E.
Which of the following is not an approach to combat drug-resistant bacteria?
A) pair a redesigned antimicrobial with inhibitors that block bacterial-resistance mechanisms B) flood a patient's system with healthy bacteria to quickly remove access to nutrients and starve the pathogen C) identify new antimicrobials D) use lytic bacteriophages to specifically target pathogens E) find multidrug approaches