Which of the following is acellular?

A. virus
B. bacterium
C. fungus
D. protozoan


Ans: A. virus

Biology & Microbiology

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Which of the following occurs during systole?

A. Both ventricles contract. B. Both atria contract. C. The left ventricle contracts. D. The ventricles fill with blood. E. The atria fill with blood.

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What effect does light have on retinal?

a. causes retinal to vibrate and warm up b. induces retinal to emit a high-energy photon c. transforms it from cis retinal to trans retinal d. decomposes retinal into rhodopsin and an opsin

Biology & Microbiology

Which of the following is a macronutrient needed by plants?

a. phosphorus b. iron c. manganese d. boron e. copper

Biology & Microbiology

Based on what we know today, what is the best explanation for why the emu, ostrich, and rhea are so

similar despite being geographically separated? What will be an ideal response?

Biology & Microbiology