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. A reflex arc allows the quick response between the hand and the brain; no interpretation occurs.
B. Sensory neurons and interneurons carry the heat sensation to the brain where it is interpreted as painful.
C. Motor neurons pull your hand away from the flame, signaling pain to the brain.
D. Interneurons form connections directly from the burned receptor molecules to the brain.
B. Sensory neurons and interneurons carry the heat sensation to the brain where it is interpreted as painful.
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In seed plants, meiosis produces ____ megaspores, however ____ leaving a single functional megaspore to produce a
____ gametophyte.
a. four; three disintegrate; male b. four; three disintegrate; female
c. eight; seven disintegrate; female d. two; one disintegrates; male e. two; one disintegrates; female
An example of passive parental care is ____
a. nutrients that cross the placenta b. nursing c. nurturing
d. the nest environment e. protection from predators
The induced-fit model
A) was proposed by Hans Buchner. B) distorts the shape of the enzyme and the substrate. C) is also called the lock-and-key model. D) states that enzyme–substrate interactions are rigid. E) proposes that very strong covalent bonds are formed upon substrate binding.
Net primary production is
A) energy made by autotrophs minus energy consumed by heterotrophs, and measured as biomass. B) heterotrophic production minus autotrophic production per unit of land per unit of time. C) heterotrophic production per unit of land per unit of time. D) energy stored by secondary consumers from primary biomass. E) energy that photosynthetic organisms make available to other organisms over a given period of time.