Which of the following is a plant-derived ingredient that served as one of the world’s first antimalarial drugs?

a. digitalis
b. aspirin
c. quinine
d. ephedrine


c. quinine

Biology & Microbiology

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An RNA strand with sequence 5'-GUACAAUGACUUAUGUAC-3' can potentially form which structure?

A. bulge loop B. internal loop C. multibranched junction D. stem-loop

Biology & Microbiology

When the ________ muscle of the leg contracts, the lower leg is moved closer to the thigh.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?

A. Auxin absorbs mostly far-red light. B. Shade is enriched in far-red wavelengths of light. C. Phytochrome in the taller plant absorbs most of the red light. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.

Biology & Microbiology

In the citric acid cycle, the acetyl group is removed from acetyl CoA and attached to oxaloacetate to form

A. fumarate. B. malate. C. citrate. D. oxaloacetate. E. succinate.

Biology & Microbiology