Which organisms can do photosynthesis when there is light and become heterotrophs in the dark?
A. foraminifera
B. zoomastigotes
C. euglenoids
D. diatoms
E. dinoflagellates
Answer: C
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Development of the human embryo's heart begins in the ________ week.
A. 16th B. 6th C. 1st D. 3rd E. 24th
Which of the following is true about lactation?
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A drug that decreases the flow of potassium through the potassium gates of the membrane would:
A. block action potentials B. increase the threshold of the membrane C. slow the return of the membrane to its resting potential D. cause the membrane to be hyperpolarized