Before a eukaryotic cell divides, ____ assemble, separate the cell's duplicated DNA molecules, and then disassemble
a. cilia
b. flagella
c. microtubules
d. microfilaments
e. intermediate filaments
c
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Ionizing radiation does NOT include
A) gamma rays. B) UV rays. C) X-rays. D) cosmic rays.
In sewage treatment, the removal of phosphates and nitrogen compounds is achieved during
A. primary treatment. B. secondary treatment. C. advanced treatment. D. quaternary treatment.
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.
The defining trait of hominins is
a. large brain. b. shoulder that can rotate 360 degrees. c. bipedalism. d. extended care of young. e. nails on fingers and toes