Two populations of flowers are separated by a mountain range and would not be capable of interbreeding. This is an example of
A. mechanical isolation.
B. ecological isolation.
C. behavioral isolation.
D. geographical isolation.
Answer: D
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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?
A. <1,000 Daltons B. >1,000 Daltons, but <1,500 Daltons C. >10,000 Daltons D. >5,000 Daltons, but <10,000 Daltons E. >1,500 Daltons, but <5,000 Daltons
What two products will the kidneys break down and convert into ammonia?
a. Nucleic acids and nitrogen b. Nucleic acids and water c. Nucleic acids and carbon dioxide d. Nucleic acids and amino acids e. Nucleic acids and sugars
Which of the following macromolecules is insoluble in water?
A) lipids B) sugars C) amino acids D) disaccharides E) nucleic acids
The symptom at the site of an animal bite that suggests rabies as a possible diagnosis is
A. inability to heal. B. blue-green pus. C. tingling or twitching. D. festering without fever.