Acanthamoeba species
A. cause keratitis.
B. are facultative parasites.
C. cause encephalitis.
D. All of the choices are correct.
Answer: D
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What are the main by-products of cellular respiration?
A. Carbon dioxide and oxygen B. Oxygen and sugars C. Water and carbon dioxide D. Sugars and water
Sickle cell anemia is an example of
1.founder effect. 2.a genetic bottleneck. 3.heterozygote advantage. 4.genetic drift. 5.gene pools.
When Bradshaw and colleagues investigated the quantitative trait loci (QTL) of two species of Mimulus (Mimulus cardinalis and Mimulus lewisii), they used marker loci as a way to map the QTLs. Their results are shown in the accompanying figure
According to these results, ________. A) the differences in genotype for the majority of these QTLs explained small amounts of the variations in flower phenotypes for both species B) some of the QTLs did have pronounced effects on the flowers' phenotypes C) at least one QTL explained 90% of the phenotypic variance for each species D) All of the above.
The urinary system helps to maintain the extracellular fluid pH by ____.
A. synthesizing buffers B. retaining carbon dioxide in the filtrate C. excreting excess hydrogen ions D. combining hydrogen ions with urea E. excreting filtrate