What did Richard Axel and Linda Buck discover about the way in which we are able to perceive many different types of odors?
A. Many different types of odors bind to just a few different types of receptor molecules.
B. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules.
C. Odors are distinguished by the way in which they bind both olfactory and taste receptors—it is the overall "picture" generated this way that we perceive.
D. None of these choices are correct.
B. Vertebrate animals make a large number of distinct types of receptor proteins, each of which binds a particular odorant molecule or small group of such molecules.
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The diploid number of chromosomes in pea plants is 14. What is the haploid chromosome number?
A. 56 B. 14 C. 28 D. 7
Which statement concerning REM sleep is true?
a. During the REM stage, delta waves are emitted. b. Most people spend almost all of their sleep time in the REM stage. c. The preoptic area of the hypothalamus stimulates REM sleep. d. During REM sleep, blood flow to the entire brain decreases. e. REM sleep is absolutely necessary, as a lack of this stage causes anxiety and irritability.
Compare and contrast synthesis reactions with decomposition reactions
What will be an ideal response?
Which of the following tissues may be specialized to secrete mucous?
Select one: a. epithelial b. connective c. muscle d. nervous e. cartilage