Place the following microbes in order by level of resistance, with highest resistance first.
A) prions, endospores, protozoan cysts, fungal spores
B) prions, protozoan cysts, naked viruses, fungal spores
C) endospores, fungal spores, hyphae, prions
D) bacterial vegetative cells, prions, naked viruses, protozoan cysts
Answer: A) prions, endospores, protozoan cysts, fungal spores
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Nerve impulses travel along neurons by the opening of channels that allow sodium ions to flow inward, followed by an outward flow of potassium ions
In order to ensure that the impulse may be produced at any time, sodium is actively transported out of the cell and potassium is transported into the cell by the sodium/potassium pump. Which of the following types of work is performed by the sodium/potassium pump? A) mechanical B) electrical C) concentration D) synthetic E) bioluminescent
Which one of the following is TRUE regarding an ecological pyramid?
A) An ecological pyramid can depict either the total amount of energy stored at each level of an ecosystem or the total biomass at each level. B) The population of producers depends largely on the populations of consumers below it. C) The amount of energy represented by tertiary consumers is greater than the amount of energy represented by primary consumers. D) Animals such as wolves and eagles would be located at the base of the pyramid. E) The amount of energy represented by producers is equivalent to the amount of energy represented by the secondary consumers.
Darwin's ideas on evolution were advanced for his time. His approach to science and natural selection were supported by what main tenet?
A. The world is fixed and constant. B. Operation of natural laws produces constant change and improvement. C. Species were unchangeable over the course of time. D. Various organisms and their structures resulted from a spontaneous action.
When glucose levels are high in the body, insulin causes the excess glucose to be converted into glycogen. When glucose levels are low, the hormone glucagon causes the conversion of glycogen back to glucose. This process is known as:
A) Krebs cycle reaction B) Gluconeogenesis C) Glycogenolysis D) Glucogenesis