A microbiologist decides to use a nutrient medium that contains thioglycolic acid. What type of microbe is she attempting to culture?
A. gram negative
B. fastidious
C. virus
D. anaerobe
E. gram positive
Answer: D
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Epithelium is indicated by
a. A. b. B. c. C. d. D. e. E.
Which statement describes enzymes?
A) Enzymes are not very specific. B) Enzymes are not affected by high heat, as proteins are. C) Enzymes can be recycled and used over and over again. D) Enzymes are "used up" during chemical reactions.
The African country of Nigeria had a 4.55% population growth rate from 2005 to 2010, the highest in the world. Which of the following statements is consistent with this fact?
A) Nigeria's age structure likely looks like a pyramid with a broad base. B) Nigerian birth rates are likely to be slightly lower than death rates. C) Nigeria is likely in the first phase of the demographic transition. D) Nigerian emigration rates are likely higher than immigration rates.
The oxygen content of dry air in the atmosphere
A. varies depending on the altitude. B. is about 0.03%. C. is inversely proportional to the partial pressure of oxygen. D. is about 78.1%. E. is about 21.0%.