What are the three major body regions of many arthropods?
A. head, thorax, and abdomen
B. head, abdomen, and legs
C. head, thorax, and legs
D. head, gastrovascular cavity, and thorax
E. head, gills, and legs
Answer: A. head, thorax, and abdomen
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To reach the mitochondrial matrix, protons travel through a channel made by the ____ of ATP synthase
a. basal unit b. headpiece c. stalk d. lollipop e. three catalytic sites
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
List two major differences between RNA and DNA at the level of the nucleotide
What will be an ideal response?
Periwinkle snails prefer to feed on the green alga Enteromorpha. In tide pools, Enteromorpha, which other alga
species, while in areas exposed at low tide, the red alga Chondrus outcompetes Enteromorpha. How did these feeding and competing interactions affect the algal populations?
a. Periwinkles decreased species richness in both tide pools and exposed areas. b. Periwinkles eliminated all of the less dominant algal species. c. Periwinkles eliminated the dominant algae entirely. d. Periwinkles decreased species richness when Enteromorpha is dominant, but increased species richness when Enteromorpha is competitively inferior. e. Periwinkles increased species richness when Enteromorpha is dominant, but decreased species richness when Enteromorpha is competitively inferior.