What are the downsides of sweat as a cooling mechanism? What will be an ideal response?
First and foremost, sweat means water loss. If too much water is lost, dehydration will become a very
real and immediate danger. Sweating would only evolve in organisms with regular access to potable
water. Second, sweat is only efficient in dry atmospheres where evaporation occurs at a suitable pace.
Third, sweating is most efficient on thinly-haired skin, so to be an efficient sweater means a sacrifice
of the valuable insulation that hair provides.
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Ectomycorrhizae, associations in which the fungal hyphae surround but do not penetrate the cell walls of the plant roots, usually involve
A. ascomycetes. B. basidiomycetes. C. zygomycetes. D. ascomycetes and basidiomycetes. E. ascomycetes and zygomycetes.
DNA is coiled into a tight spiral and makes up the ____________ that are the genetic material in a cell
a. genes b. amino acids c. enzymes d. nucleus e. chromosomes
If you observe the activity at the cell membrane as the action potential passes, first you will see ________ the cell, then you will see ________ the cell
a. NA+ enter; K+ leave b. NA+ leave; K+ enter c. NA+ leave; NA+ enter d. K+ enter; NA+ leave e. K+ leave; NA+ enter
The letter “C” in the above figure represents
a. trigger zone. b. output zone. c. input zone. d. conducting zone. e. none of these.