Which of the following are reasons why Koch's postulates are not universally applicable?
a. Many human disease lack suitable animal model
b. Not all pathogens have genes that confer pathogenicity
c. Viruses have a very narrow host range
d. Many human infections are polymicrobial
a. Many human disease lack suitable animal model
c. Viruses have a very narrow host range
d. Many human infections are polymicrobial
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Which best describes the difference between chronic and acute lymphocytic leukemias?
A) Chronic lymphocytic leukemias are exclusive of T-cell origin. B) Acute lymphocytic leukemias have a high response rate to chemotherapy. C) Chronic lymphocytic leukemias have a shorter survival time. D) Acute lymphocytic leukemias progress more slowly.
What is the cloaca?
A. The body opening that serves solely as the exit for wastes from a complete digestive tract B. The second region of the intestine C. A muscular digestive organ that chemically and mechanically breaks down food D. The body opening that serves as the exit for digestive and urinary waste; also functions in reproduction E. The terminal portion of the large intestine
A neuron's membrane that maintains a charge difference across its surface in which the inside is more negative than the outside is called ________
A) action potential B) graded potential C) summation D) resting potential
What type of reaction is necessary to produce a dipeptide from individual amino acids?
A) dehydration reaction B) hydrolysis reaction C) denaturation D) Dipeptides are not formed from amino acids. E) None of the answer choices will form a dipeptide.