Most of the organisms that normally inhabit our skin help defend us against infection
a. True
b. False
True
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The simultaneous movement of sucrose into a cell against its concentration gradient and protons into a cell with their concentration gradient is best described as an example of
a. symport. b. passive diffusion. c. antiport. d. facilitated diffusion. e. active transport.
Synaptic integration means that ____
a. positive or excitatory stimuli produce an excitatory postsynaptic potential b. the positive and negative ions neutralize each other c. excitatory and inhibitory signals are summed in a receiving neuron d. the adjacent neurons interact so that excitatory and inhibitory stimuli cancel each other out e. excitatory signals take precedence over inhibitory signals
The villi of the small intestine are invaginations of the ________.
A. mucosa, submucosa and serosa B. submucosa and mucosa C. muscularis only D. mucosa only E. serosa, muscularis, submucosa and mucosa F. serosa only