What is one of the most important survival mechanisms of tubercular bacteria within the body?
A. Eludes killing by the alveolar macrophages (white blood cells of the lung) by preventing fusion of lysosomes with the phagosome
B. Eludes the immune system by killing the white blood cells wuickly
C. Eludes killing by alveolar macrophages by secreting a toxin that kills these cells
D. Eludes the immune system by constant changing protein coats (antigens)
Answer: A. Eludes killing by the alveolar macrophages (white blood cells of the lung) by preventing fusion of lysosomes with the phagosome
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Cancers of epithelial tissues are called
A. lymphomas. B. leukemias. C. blastomas. D. sarcomas. E. carcinomas.
A gene mutation is defined as change in the
A) structure of ribosomes. B) activation of a gene. C) nucleotide sequence of DNA. D) nucleotide sequence of RNA.
Chemical cycling may involve all but which of the following?
A. a biotic community in which chemicals move through food chains B. a reservoir unavailable to producers C. an exchange pool as a source from which organisms can acquire chemicals D. a geological component, in which chemicals move through the soil or the air E. All of the choices are correct.
If one was attempting to estimate the parameter, b, that best explains the relationship between Sales and price using the following equation Sales = (Price - b)2. Which of the following methods would be the most appropriate to estimate b?
A. Nonlinear regression B. Simple linear regression C. Multiple linear regression D. Probit