Acetic acid gives vinegar its sour taste. Which functional group has acidic properties and would release hydrogen ions in an aqueous (water) solution?
A. -OH
B. -NH2
C. -SH
D. -COOH
E. -CO
D. -COOH
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Increasing global population, overcrowding and international travel have contributed to many changes in epidemiological trends of infectious disease. Which of the following would have been just as likely to occur a century ago as today?
A. The incidence of bubonic plague in humans, transmitted via the rat flea, is gradually increasing in the United States with most of the cases reported in the west. B. Gonorrhea, one of the oldest known STDs, is becoming increasingly difficult to treat due to multi-drug resistance strains of Neisseria gonorrhea. C. An individual was placed under a government-ordered isolation after traveling while infected with a drug resistant strain of Mycobacterium tuberculosis. D. West Nile encephalitis, a zoonotic disease caused by a virus first isolated in Uganda, is now a world-wide pandemic in human and animals.
Which of the following is caused by a virus?
a. pernicious anemia b. sickle cell anemia c. infectious mononucleosis d. hemolytic anemia e. iron-deficiency anemia
Which is a byproduct of photosynthesis?
a. water b. light c. glucose d. oxygen e. carbon dioxide
Which of the following statements most correctly defines homeostasis?
A. All living organisms are alike. B. It takes energy to maintain the organization of the cell. C. Cells and organisms maintain a fairly constant internal environment. D. Living organisms do not change much over time. E. Human beings and other animals acquire materials and energy when they eat food.