The rasping tongue, the radula, is present in which molluscan group?
A. clam
B. scallops
C. oyster
D. bivalve
E. snail
Answer: E
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A 17-year-old male with a severe eye infection admits that he does not clean his contact lenses as often as he should. His eye infection is most likely the result of which parasite?
a. Toxoplasma gondii b. Isospora belli c. Strongyloides stercoralis d. Acanthamoeba spp.
How does sickle cell anemia reduce the blood’s ability to deliver oxygen to tissues?
a. The plasma membrane is too thick to allow oxygen to diffuse into sickle-shaped red blood cells. b. Sickle-shaped red blood cells puncture normal red blood cells, causing them to rupture and lose hemoglobin. c. Deformed red blood cells clog capillaries, preventing other red blood cells from passing through. d. Sickle cells contain a mutated form of hemoglobin that binds to half as many oxygen molecules.
________ is the ultimate source of genetic variation in populations
A) Natural selection B) Genetic drift C) Gene flow D) Mutation E) Recombination
From where does the O2 released during the light reactions of photosynthesis come?
A) C6H12O6 B) H2O C) CO2 D) RuBP E) ATP