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
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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.
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.
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.
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