All of the following bacteria are part of the normal flora EXCEPT:
A. Salmonella spp.
B. Bacteroids spp.
C. Lactobacillus spp.
D. Staphylococcus spp.
E. Viridans streptococci
Answer: A. Salmonella spp.
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One function of sphincter muscles is to
a. control the passage of food through the GI tract b. secrete digestive juices into the GI tract c. control peristalsis d. trigger hormone release e. grind large food particles
The division of microbes termed the Firmicutes have a cell wall type best described as ________.
A. gram-negative B. gram-positive C. archaeal D. lacking a cell wall
Which of the following statements is true about the serotonin receptor family?
a. Most of the receptors are ionotropic b. 5-HT1A receptors are located primarily in the cerebral cortex c. 5-HT2A receptors cause inhibition by decreasing adenyl cyclase and increasing potassium efflux d. The newer antipsychotics like Risperdal act by blocking the 5-HT2A receptor e. LSD and similar hallucinogens are most likely agonists at the 5-HT1A receptor
Refer to the accompanying figure. What is the structure labeled as 6?
a. anus
b. gills
c. cilia
d. mouth
e. digestive tract