The organ of Corti is a
a. chemoreceptor.
b. mechanoreceptor.
c. photoreceptor.
d. nociceptor.
e. osmoreceptor
B
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Which of the following animals has a heart with two chambers: one atrium and one ventricle?
a. bird b. mammal c. frog d. fish
There are seven cervical vertebrae located in the neck and during the course of evolution, these vertebrae have become fused.
a. true b. false
Analysis of the 1918 and 2009 flu epidemics reveals that the most likely scenario was that ________
A) the virus causing these outbreaks were derived from a single strain within which significant mutations changed the protein hemagglutinin B) these viruses switched from using RNA to using DNA C) the virus ultimately arose in birds, jumped to pigs, and then was able to switch to humans D) strong selection produces particularly virulent flu strains with predictable periodicity
A cell may meet the demand for large quantities of a specific protein by:
a. blocking transcription of the gene that encodes the protein. b. decreasing the half-life of the mRNA that specifies the protein. c. adding methyl groups to the gene that encodes the protein. d. gene amplification e. inhibition of DNA synthesis