Which of the following is commonly the source of leptospirosis?
A) infected animal urine
B) infected animal bites
C) humans infected with leptospirosis
D) infected animal feces
E) infected human urine
A
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During this phase of the cell cycle the chromosomes line up in the center of the cell:
A. Metaphase B. Prometaphase C. Telophase D. Anaphase E. Prophase
A group of cells having similar structure and function is called a(n) _____
A. organ system. B. tissue. C. population. D. organ. E. organism.
The refractory period of a neuron plasma membrane is important because
a. it establishes the resting potential. b. it initiates an action potential. c. it ensures that the threshold potential will be reached. d. it ensures that an impulse will travel in a one-way direction. e. in resets the threshold potential.
Linnaeus based most of his classification system on _____________.
a. cell organelles b. biochemical comparisons c. structural comparison d. embryology