Diarrhea, nausea, and vomiting are signs and symptoms associated with which of the following viruses?
A. coxsackie A
B. enterovirus
C. rhinovirus
D. echovirus
E. norovirus
Answer: E
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Based on genetic comparisons,
a. people of different races often have more genetic similarities than many individuals within a race. b. humans have a more ancient origin than chimpanzees. c. there is much genetic diversity among cheetahs. d. among humans, many genetic variations are restricted to certain racial groups. e. there is no difference between different races of humans.
The Humboldt Current runs along the coast of South America, carrying nitrogen-rich cold water northward.
Answer the following statement true (T) or false (F)
Phosphofructokinase (PFK) is an enzyme that converts fructose 6-phosphate to fructose 1,6-bisphosphate, by adding a phosphate group. This is the first committed step of the metabolic pathway of glycolysis, and thus it is very tightly regulated. AMP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and stimulates the formation of fructose 1,6-bisphosphate. ATP binds to PFK at a site distinct from the binding site for fructose 6-phosphate, and inhibits the formation of fructose 1,6-bisphosphate. There are other regulators of this enzyme as well. What is the role of AMP in this example?
A. noncompetitive inhibitor B. allosteric inhibitor C. catalyst D. competitive inhibitor E. allosteric activator
Answer the following questions true (T) or false (F)
1. Some hormones may take up to several hours to work. 2. The adrenal glands are located close to the heart. 3. Most peptide hormones enter the target cell through large channels.