Aquatic biomes are defined primarily by ________
A) the animals that live there
B) the plants that live there
C) their temperature
D) their salinity
D
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What structure best represents a polymer?
A. A fatty acid. B. A monosaccharide. C. A nucleotide. D. An amino acid. E. A protein.
The structure designated by the letter "B" in the above figure is called the ____
a. pyloric sphincter b. esophagus c. small intestine d. duodenum e. appendix
A human red blood cell in an artery of the left arm is on its way to deliver oxygen to a cell in the thumb. To travel from the artery to the thumb and then back to the left ventricle, this red blood cell must pass through _____
A) one capillary bed B) two capillary beds C) three capillary beds D) four capillary beds
Which is a definition of a radioresistant tumor?
a. tumor is completely eradicated by chemical therapy b. tumor requires large doses of radiation to produce death of cells c. Tumor in which irradiation causes death of cancer cells without damage to surrounding tissue d. tumor is not significantly affected by drug treatment e. tumor is resistant to surgical intervention