The most common mode for the transmission of Schistosoma haematobium is ________.
A. contaminated meat
B. opportunism
C. contaminated water
D. fecal-oral route
E. fomites
Answer: C
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A microbiologist is working with two genera of bacteria, A and B, to determine if cells are competent. Strains are grown under optimal conditions, and DNA fragments that carry the gene for green fluorescent protein is added to each culture at 20-minute intervals. Samples from each treatment are plated to nutrient agar and incubated, after which the plates are examined under an ultraviolet lamp. The microbiologist observes that all plates of bacteria B contain colonies that are fluorescent, while for bacteria A only the plates from stationary phase demonstrate fluorescent colonies. What can be concluded from these results?
A. Competence in bacteria A is constitutively expressed. B. Competence in bacteria B is dependent on the phase of growth. C. Both bacteria A and bacteria B cells are competent. D. Neither bacteria A nor bacteria B cells are competent.
What is the primary function of the sinoatrial node?
A) Initiates the contraction of the heart B) Increases or decreases blood pressure C) Opens and closes the heart valves D) Supplies the heart muscle with oxygen
If the age structure of a country's population is balanced, what prediction can be made about the near future?
A. The population will increase rapidly. B. The birth rate will decline. C. The demographic transition will begin. D. The death rate will decline. E. The population will not increase rapidly.
During which phase of mitosis do the centromeres line up along the cell equator?
A) Anaphase B) Prophase C) Metaphase D) Telophase