A student noticed that when he closed his eyes, he could still determine the position of his arms and legs. This is largely due to the activity of
A) pain receptors.
B) mechanoreceptors.
C) Merkel disks.
D) Meissner's corpuscles.
E) chemoreceptors.
B
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Histones are ____ and _________ proteins
a. large; negatively charged b. large; positively charged c. small; positively charged d. small; negatively charged e. large; uncharged
Which of the following is a characteristic of r-selected organisms?
a. mature late b. increased parental care c. lower longevity d. larger offspring
Pheromones
a. are social signals. b. are detected by the vomeronasal organ in reptiles and most mammals. c. may serve as sex attractants. d. are not detected or responded to by humans. e. include all EXCEPT "are not detected or responded to by humans.
Which of the following is a byproduct of photosynthesis?
A) carbon dioxide B) water C) oxygen D) glucose E) energy