Which of the following is NOT true of cholera?
A) The causative agent lives naturally in marine water
B) There is an effective vaccine for cholera
C) Strain O1 El Tor has been responsible for several pandemics
D) Rice-water stool is a symptom
Answer: B) There is an effective vaccine for cholera
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Suppose that you have a cell with a membrane that is permeable to water but not to Na+ or Cl? or any
other solute. There is more NaCl outside the cell than inside the cell, and the osmolarity of the cell is higher than that of the solution surrounding the cell. Which of the following should occur?
a. Overall, the cell should lose water. b. Overall, the cell should take up water, Na+, and Cl?. c. Overall, the cell should take up water. d. Overall, the cell should take up water and lose Na+ and Cl?. e. Overall, the cell should lose water and take up Na+ and Cl?.
Due to reproductive isolation, a new species of weaver bird is evolving. Is it likely to use a social or solitary nesting strategy?
A. It depends on whether it lives in the forest or the open savanna. B. It depends on whether it lives in near water or near the desert. C. It depends on how many similar species it is competing with. D. It depends on how many eggs it lays.
What must happen to amino acids before they can be used in catabolic reactions?
A. They must be deaminated. B. They must be deoxygenated. C. They must be dehydrogenated. D. They must be decarboxylated.
Which plasma membrane component can be either found on its surface or embedded in the membrane structure?
a) cholesterol b) protein c) carbohydrate d) phospholipid