Which of the following human mutations correlates with resistance to plasmodial infections in West Africa?
A) hemoglobin S
B) one particular MHC class I gene
C) one particular set of MHC class II genes
D) hemoglobin S and particular class I and class II genes
Answer: D
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Detergents are best able to dissolve oil from fabric or dishes during washing because
A) the positively charged end is associated with a sphere of hydration, while the negatively charged end interacts with the oil droplet. B) the negatively charged end is associated with a sphere of hydration, while the positively charged end interacts with the oil droplet. C) the nonpolar end is associated with a sphere of hydration, while the charged end interacts with the oil droplet. D) the charged end is associated with a sphere of hydration, while the nonpolar end interacts with the oil droplet. E) because detergents are nonpolar, they increase the size of the oil droplet, allowing the water to be more effective at removing the oil.
An environmental testing laboratory is unable to identify a single-celled organism isolated from a well water sample. Inspection of the microorganism with a compound microscope reveals that it uses pseudopodia for movement and is not enclosed within a mineral shell. Based on this information, this organism can be classified to which supergroup?
A. Opisthokonta B. Alveolata C. Amoebozoa D. Rhizaria E. Excavata
A gene discovery technique that looks at regions of the genome where individuals have the same alleles much more often than expected by chance, because their ancestors were blood relatives, is called
A) homozygosity mapping. B) heterozygosity mapping. C) the defective sibling pair approach. D) empiric risk.
The alternate name for the mitral valve is
a. the left atrioventricular valve. b. the aortic semilunar valve. c. the tricuspid valve. d. the right atrioventricular valve. e. the pulmonary semilunar valve.