The first case in an epidemic is called the ________.
A. index case
B. break case
C. prime case
D. alpha case
Answer: A
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Which function of cellular membranes is critical to the ionic and molecular organization of cells?
a. the controlled transport of ions and molecules across the membrane
b. cell-cell binding c. recognition of other cells as being "foreign" or "self" d. reception of chemical signals from other cells e. participation in metabolic reactions
Which of the following is not a feature common to most animals?
a) development into a fixed body plan b) asexual reproduction c) specialized tissues d) heterotrophic nutrient sourcing
During the summer of 2010, very large forest fires occurred in western Russia. At one point, the cloud of smoke spread over 1000 miles (approximately 1600 km), enveloping a number of cities. The smoke was thicker than any you would see in a tobacco
store! Based on the information in this chapter alone, why do you think the daily death rate due to heart disease in Moscow doubled during that time? What will be an ideal response?
Which of the following statements is true?
(a) Amoebae have transporter proteins that actively pump water molecules from the cytoplasm to the cell exterior. (b) Bacteria and animal cells rely on the Na+-K+ pump in the plasma membrane to prevent lysis resulting from osmotic imbalances. (c) The Na+-K+ pump allows animal cells to thrive under conditions of very low ionic strength. (d) The Na+-K+ pump helps to keep both Na+ and Cl– ions out of the cell.