Pathogens enter the skin through which means?
a. bites of other organisms
b. diffusion across the stratum corneum
c. breaks in the skin
d. digestive enzymes creating passage
a. bites of other organisms
c. breaks in the skin
d. digestive enzymes creating passage
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Which of the following occurs first during an action potential?
a. Many sodium ions flow into the neuron. b. Voltage-gated sodium channels open. c. A local disturbance triggers the resting voltage to exceed the threshold level. d. The interior of the neuron becomes positive. e. The interior of the neuron becomes negative.
What is the term given to the theory which states that the fertilized egg contains a complete miniature adult?
A) preformation B) transduction C) cell theory D) conjugation E) transformation
In rheumatoid arthritis, IgM, IgG, and complement deposit in joints. This is an example of
A) cytotoxic autoimmunity. B) immune complex autoimmunity. C) cell-mediated autoimmunity. D) immunosuppression. E) acquired immunodeficiency.
Lateral buds tend to stay dormant when:
A) conditions are favorable for leaf growth. B) healthy apical meristems produce hormones that suppress their growth. C) damaged apical meristems produce hormones that suppress their growth. D) root growth is rapid.