Impetigo is caused by ________.

A. C. diphtheriae
B. S. pyogenes
C. C. perfringens
D. S. aureus
E. Both S. aureus and S. pyogenes are correct.


Answer: E

Biology & Microbiology

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World human population in 2009 was approximately

A. 670 million. B. 1.8 billion. C. 4.6 billion. D. 6.7 billion. E. 10 billion.

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When an action potential begins and sodium channels open, why does sodium rush into the cell? (Check all that apply.) 

_____ The inside of the cell is negatively charged. _____ The inside of the cell is positively charged. _____ Chloride ions are waiting to bind to the sodium inside the cell. _____ The diffusion gradient drives sodium into the cell. _____ Channels use energy to move ions across the membrane whenever they are open.

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Limiting factors

a. produce more pronounced effects as a population grows. b. prevent indefinite, exponential population growth. c. can be either density-dependent or densityindependent. d. acting together constitute environmental resistance to population growth. e. include all of these.

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Which of the following organs of the endocrine system secretes thyroxine and calcitonin?

a. pituitary gland b. pancreas c. hypothalamus d. adrenal glands e. thyroid gland

Biology & Microbiology