__________ sense pain. Fill in the blank(s) with the appropriate word(s)
ANSWER: Nociceptors
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HIV/AIDS can be categorized as a new or emerging infectious disease. By putting it into this category, we are effectively saying that
A. this infection hasn't been observed in the human population prior to recent (approximately 50 years or sooner) outbreaks. B. this disease has been in susceptible populations for centuries, but has only recently achieved infection levels that became detectable. C. the infectious agent is still evolving and changing, unlike with older, more established diseases such as plague or polio. D. the disease has always been in susceptible populations and causing disease, but we lacked the technology to detect it.
Which is a risk that must be assumed when we genetically engineer a living individual? a. On which chromosome will the virus integrate the injected gene
b. The inserted gene may disrupt the normal genetics of the cell. c. All are risks associated with gene therapy. d. Development of an allergic reaction to the viral vector. e. Cancer may be the result of the inserted gene.
In muscle contraction, which of the following
triggers the power stroke?
a. release of Pi from the myosin head b. binding of ATP to the myosin head c. hydrolysis of ATP into ADP and Pi d. cross-bridge formation between actin and myosin e. relaxation of the sarcomere
Gastrulation producesa(n) ____
a. hollow balls of cells b. embryo with germ layers c. solid balls of cells d. haploid cells e. yolk sac