The following are true of endorphins except ____.
A. they affect multiple adjacent neurons
B. they are natural painkillers
C. they are secreted when people laugh
D. they are released when people get a massage
E. they are suppressed under strenuous activity
Answer: E
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Individuals with a genetic variant in the promoter region of the MAOA gene display violent behavior, independent of environmental factors
a. True b. False Indicate whether the statement is true or false
Functions of the glycocalyx include all of the following EXCEPT
A) biofilm formation. B) increased virulence. C) source of nutrition. D) protection against dehydration. E) binary fission.
Enzymes that catalyze removal of carbon dioxide from a substrate are called
A. ligases. B. phosphotransferases. C. decarboxylases. D. aminotransferases. E. oxidoreductases.
Which of the following are strategies with which vertebrate hosts counteract the asymmetries between most pathogens and their hosts?
a. somatic mutation and lateral gene transfer between immune system cells b. somatic recombination and restriction endonucleases c. somatic mutation and recombination d. rapid population growth of host organisms and clonal expansion