Most of the organisms that normally inhabit our skin help defend us against infection

a. True
b. False


True

Biology & Microbiology

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Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology