The primary nitrogen-containing compound excreted by our kidneys is __________.
a. uric acid
b. amino acids
c. ammonia
d. urea
e. nitrite
Ans: d. urea
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Which of the following is not true of the preliminary findings by the HMP thus far?
A. microbial antagonism prevents potential pathogens in the resident biota from causing disease B. the number of bacterial genes outnumber human genes by millions in the holobiont C. viruses have played an important role in guiding the evolution of both humans and their resident flora D. there are many more sterile sites in the human than were previously assumed
A solution registers 12 on the pH scale. This solution is:
A homologous pair of mitotic chromosomes will possess ________ alleles for each locus.
A. one B. 50% of the C. eight D. four E. two
Four-year-old Sammy is having a temper-tantrum. In a final attempt to get his way, he yells to his mom, "I'm gonna hold my breath 'til I die!" What is the primary reason that Sammy's mom is unconcerned by this statement?
A. It is impossible for Sammy to control the contraction of his diaphragm and intercostal muscles since they are made up of smooth muscle. B. Sammy is too young to hold his breath for more than 30 seconds. C. As Sammy holds his breath, the increasing levels of carbon dioxide in his blood will lead to stimulation of the respiratory control center in his brain. D. As Sammy holds his breath, the decreasing levels of oxygen in his blood will lead to stimulation of the respiratory control center in his brain.