During an action potential, repolarization occurs _____
when sodium diffuses into the cell
when potassium diffuses out of the cell
when calcium ions diffuse into the synaptic knob
only where sodium-potassium pumps are absent
B. when potassium diffuses out of the cell
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Which of the following is NOT a characteristic of shade leaves on a plant?
A. more chlorophyll production B. less mesophyll tissue C. more air spaces D. lacking an epidermal layer E. lacking mesophyll tissue
Insulin stimulates ____
a. muscle and fat cells to take up glucose b. increased levels of glucose in the blood c. a decrease in muscle cell activity d. an increase in exercise e. liver cells to release glycogen
Which nutritional category do animals and most pathogenic bacteria fall into?
a. chemoheterotrophs b. chemoautotrophs c. photoautotrophs d. photoheterotrophs
Organisms that require high levels of sodium chloride in order to grow are called ________ organisms.
Fill in the blank(s) with the appropriate word(s).