On a daily basis what percentage of the water the kidneys filter is excreted in urine?
a. 1 percent
b. 10 percent
c. 20 percent
d. 50 percent
e. 100 percent
ANSWER: a
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Which of the following statements about steroid receptors is FALSE?
A. The receptors undergo a conformational change after binding the steroid. B. The receptors are localized to the plasma membrane. C. Once the steroid binds the receptor, the steroid/receptor complexes dimerize. D. Steroid receptors act as transcriptional factors, regulating the expression of certain genes and the subsequent production of proteins. E. Steroid receptors are localized to either the cytoplasm or nucleus.
The skin surface is a very favorable environment for colonization by most microorganisms.
Answer the following statement true (T) or false (F)
Viruses with a tail attached at one side of a polyhedral head are called ____
a. simple viruses b. helical viruses c. enveloped viruses d. complex viruses e. viroids
Which cells produce pepsinogen in the stomach?
a. brush border cells b. chief cells c. choanocytes d. parietal cells e. villi