El Niño is a recurring weather phenomenon that
a. increases global warming.
b. stabilizes world climates.
c. produces a fluctuation in global climates.
d. depletes the ozone layer.
e. increases oceanic productivity.
Answer: c
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Which of the following is the best explanation for why unsaturated fats tend to be more fluid at
biological temperatures than saturated fats?
a. Double bonds in saturated fats cause them to be denser and thus more solid than unsaturated fats. b. The presence of extra hydrogen atoms in saturated fats makes them lighter, so they float away from water and congeal together more easily than unsaturated fats. c. The presence of extra hydrogen atoms in saturated fats makes them denser than unsaturated fats, and denser materials tend to be more solid. d. Because unsaturated fats can still be hydrogenated but saturated fats cannot, the unsaturated fats are more reactive and thus more fluid. e. Kinks in the chain of an unsaturated fat create more disorder or irregularity in the structure of the molecule, making unsaturated fats harder to pack together than saturated fats.
Refer to Figure 31-1. Which of the following structures are feeding polyps?
A. 1. B. 4. C. 6. D. 7. E. 9.
The gene p53 is called the "guardian of the genome" because it corrects mutations in the spindle apparatus before nondisjunction can occur
Indicate whether the statement is true or false
All the following are events of early inflammation, except
A. exudate and pus can accumulate. B. brief vasoconstriction is followed by vasodilation. C. macrophages appear first and begin phagocytosis. D. chemical mediators and cytokines are released. E. capillaries become more permeable resulting in edema.