What is happening when a neuron is at rest before an action potential?
A) The membrane is depolarized.
B) Membrane ion channels are open.
C) Potassium is diffusing out of the cell.
D) The inside of the neuron is negative relative to just outside the neuron.
D
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Metagenomics offers a DNA-based method to understand
A. the history of species diversity. B. the time hypothesis. C. microbial diversity. D. the organismic model of Clements. E. the Shannon Diversity Index.
In their experiments to identify the transforming principle, Avery, MacLeod, and McCarty used enzymes that break
down ____.
a. protein, DNA, and RNA b. protein and RNA only c. DNA only d. protein, lipids, and RNA
e. lipids and DNA onlyWhen the heart’s pacemaker malfunctions, ___ can result
a. atherosclerosis b. sudden cardiac arrest c. congenital heart defects d. coronary heart diseases e. hypertrophic cardiac defects
Plants have special growth tissues called ________.
a) endoderm b) gametangia c) apical meristems d) sporangia