If you touch a hot stove and burn your hand, the pain isn't actually in your hand-it's in your head. What evidence can you provide to substantiate this claim?
A. Interneurons form connections directly from the burned receptor molecules to the brain.
B. Motor neurons pull your hand away from the flame, signaling pain to the brain.
C. Sensory neurons and interneurons carry the heat sensation to the brain where it is interpreted as painful.
D. A reflex arc allows the quick response between the hand and the brain; no interpretation occurs.
Answer: C
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The diversity of our native grassland species is in decline. Restoration ecologists working to restore native grasslands are experimenting with combinations of burning and grazing to simulate natural conditions and increase species diversity
According to Joseph Connell, what level of burning and grazing should ecologists aim for? A. Strong enough to limit interspecific competition, but not strong enough to limit the number of species that can tolerate the environment. B. Strong enough to promote interspecific competition and niche diversification, but not strong enough to promote competitive exclusion. C. Strong enough to promote indirect competition, but not strong enough to promote direct competition. D. Strong enough to selectively favor one or more keystone species, but not strong enough to favor their competitors. E. None of these.
If a specimen contains 30% adenine in its DNA then how much cytosine will there be?
A. 40% B. 30% C. 20% D. 10% E. Cannot be determined.
Dogs use panting to dissipate excess heat. What part of their brain detects the need for this response and sends the signal to pant?
A. hippocampus B. prefrontal cortex C. amygdala D. hypothalamus
Antigen presenting cells
A. include dendritic cells. B. include macrophages. C. hold and present processed antigen on their cell membrane surface. D. engulf and modify antigen to be more immunogenic. E. All of these choices are correct.