The study of DNA sequences indicates that the evolution of new functions for proteins typically occurs ________.
a. after gene duplication
b. after genetic drift
c. before gene duplication
d. during gene flow
a. after gene duplication
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Untreated diabetes mellitus can lead to a condition in which the blood is more acidic than normal. What two organ systems play the largest role in compensating for acid-base imbalances?
Which statement about carbon is correct?
a. Heterotrophs consume autotrophs to obtain carbon. b. Photosynthesis converts organic carbon to carbon dioxide gas. c. Carbon is the most abundant element in all living organisms. d. The long-term cycling of carbon occurs through respiration.
Notochords are found in
a. adult hemichordates (acorn worms). b. adult urochordates (tunicates). c. adult cephalochordates (lancelets). d. a and b only. e. b and c only.
The structures that connect neighboring cardiac muscle cells to ensure rapid electrical conduction are
a. desmosomes. b. intercalated discs. c. synapses. d. endothelial cells. e. smooth muscle cells.