A molecule that is detected by our sense of smell first binds to
A) specific receptor proteins on the cilia of receptor cells located in the epithelium of the upper nasal cavity.
B) hairs that extend beyond the mucous layer and line the upper and lower nasal cavities.
C) special mechanoreceptor cells located in the epithelium of the lower nasal cavity.
D) special receptor proteins located at the surface of thermoreceptor cells lining the upper nasal cavity.
Answer: A
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A trait with variable expressivity is one that:
A. is only expressed in homozygous recessive individuals. B. is only expressed in homozygous dominant individuals. C. is only expressed in some of the individuals that have the genotype for that trait. D. is expressed in only some offspring of affected individuals. E. can be expressed differently in different individuals that have the genotype for that trait.
Which of the following recognizes response elements, control elements, and regulatory elements?
A. General transcription factors B. Regulatory transcription factors C. Mediator D. Transactivation domains
All else being equal, a shaved shrew loses less heat by convection than an unshaved shrew.
a. true b. false
What percent of males have some degree of color blindness?
A) 0.8 percent B) 8 percent C) 0.5 percent D) 5 percent E) 10 percent