The major significance of Robert Koch's work is that
A) microorganisms are present in a diseased animal.
B) diseases can be transmitted from one animal to another.
C) microorganisms can be cultured.
D) microorganisms cause disease.
E) microorganisms are the result of disease.
D
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Which of the following best describes the innate immunity?
A. It is a response to a specific pathogen. B. It is the basis for the use of vaccines. C. It reacts to a wide variety of pathogens. D. It is a response to a specific pathogen AND is the basis for the use of vaccines.
Which of the following is not true of human immunodeficiency virus (HIV)?
A. It is the causative agent of acquired immune deficiency syndrome (AIDS). B. It targets the B cells of the immune system. C. It binds to the cell surface receptor CD4. D. It kills many of the cells it infects but can integrate into the host genome. E. It has the most error-prone of all reverse transcriptases, which results in a high mutation rate.
Parathyroid hormone causes the blood calcium level to rise, but calcitonin causes those levels to fall. The relationship between the two hormones is described as ________
A) expressive B) antagonistic C) synergistic D) permissive
A niche of a living organism is
A. that place or localized region where it is usually found. B. approximately the same narrow range for any organism. C. usually capable of being continuously occupied by several species. D. made up of many needs of the organism and interactions with its environment.