Mammals are the only vertebrates to possess
A. hair.
B. single loop circulation.
C. a four-chambered heart with a pulmonary circuit.
D. endothermy.
E. live birth.
A. hair.
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Hormones that promote homeostasis _____
A) are not found as members of antagonistic signaling mechanisms B) travel to target cells without passage in the plasma C) utilize receptors that bind any hormone D) initiate signal transduction in the target cell without binding to receptors E) usually operate as part of a negative feedback system
A potassium ion gradient is set up in insect Malpighian tubules through an active transport process. As a result, potassium concentration is higher in the lumen of the tubules than in hemolymph. How would the potassium gradient affect water movement?
A) Water would be forced out of the lumen of the Malpighian tubules through an osmotic gradient. B) The potassium gradient would have no effect on water movement. C) There would be a net movement of water into the lumen of the tubules. D) Water would be conserved, forming a hypertonic solution in the Malpighian tubules.
_____ are an example of seedless vascular plants.
a) Pine trees b) Mosses c) Charophyceans d) Ferns e) Lilacs
Nucleic acids, proteins, and complex carbohydrates are all produced by
A) hydrolytic reactions. B) dehydration synthesis. C) exchange reactions. D) hydrogen bonding. E) catabolic reactions.