Individuals with one sickle cell allele and one normal hemoglobin allele are not affected by the malaria parasite

because of ____.



a. neutral mutations
b. heterozygote advantage
c. frequency-dependent selection
d. disruptive selection
e. stabilizing selection


ANSWER: b

Biology & Microbiology

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Sulfonamides and other drugs that inhibit folic acid synthesis have a high therapeutic index because

A. humans synthesize folic acid by a process that is not sensitive to sulfonamides. B. humans do not use folic acid. C. humans do not synthesize folic acid but obtain it in their diets. D. None of these are correct.

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About 10?15% of African Americans are carriers for ____, an autosomal recessive genetic disorder

where a defective version of hemoglobin is produced.

a. Duchenne muscular dystrophy b. phenylketonuria c. achondroplasia d. sickle-cell disease e. cystic fibrosis

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Which of these items of garbage have components that will last over 100 years?

a. paper b. disposable diaper c. plastic bag d. cigarette filter e. cardboard

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A detritivore feeds primarily on dead plant or animal matter

Indicate whether the statement is true or false

Biology & Microbiology