The hair cells in the utricle detect
A) subsonic sound vibrations.
B) volume and pitch of sounds.
C) differences in air pressure waves.
D) position of the head with respect to gravity.
Answer: D
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Which of the following statements about nitrogenous waste excretion is correct?
A. Uric acid is less toxic than ammonia, but more energetically costly to produce. B. Ammonia is more toxic than urea, but requires less water for excretion. C. Urea is less toxic than uric acid, but more energetically costly to produce. D. Uric acid is less toxic than urea, but requires more water for excretion. E. Ammonia is less toxic than uric acid, but requires more water for excretion.
Ammonium chloride, a commonly used salt in minimal medium, ____
a. is an organic carbon source b. provides nitrogen c. jellifies the medium d. liquefies the medium e. sterilizes the medium
All of the following are true for Amoebas except the following:
A. Eat by diffusion B. Are part of the phylum Rhizopods C. Move by pseudopod D. Is a animal like protist
A number of different genes have been identified as affecting skin color and there are probably more as yet unidentified. Each of these genes likely has several regulatory protein factors affecting their expression, and those proteins are coded for by
yet more genes. Thus there are many genes, some of which have multiple alleles, involved in determining skin color. What property of skin color does this multigene foundation not explain? A) Some people tan easily and some get sunburned rather than becoming tan. B) Some people have very dark skin, some have very light skin, and there is nearly continuous variation in between. C) There is variation in the amount of vitamin D humans need. D) Skin color can be acted on by natural selection.