Which of the following is an advantage of bacterial culture in diagnosing an infection?
A. Standardized, selective media can differentiate bacteria based on their ability to grow.
B. AH bacteria can be easily evaluated by culture.
C. The method is very rapid.
D. The method rarely poses risks to laboratory personnel
Ans: A. Standardized, selective media can differentiate bacteria based on their ability to grow.
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Photographs of cells from onion root tips are often used to show chromosomes primarily because these cells are:
A. diploid. B. rapidly undergoing mitosis. C. rapidly undergoing meiosis. D. in stationary phase. E. lacking organelles.
Floods and earthquakes that affect population size are ____
a. carrying capacities b. replacement factors c. density-dependent controls d. density-limiting controls e. density-independent controls
Which of the following statements about cancer is incorrect?
A. Cancers are the direct result of mutations in growth-regulating genes. B. Benign cells are those that have metastasized. C. Cancer cells can sometimes spread into the bloodstream. D. Malignant tumors are not encapsulated. E. Malignant tumors are invasive.
Carbon-14 has the same:
A) number of protons but more neutrons than carbon-12. B) atomic number and atomic mass as carbon-12. C) atomic number and, therefore, the same number of neutrons as carbon-13. D) atomic mass as both carbon-12 and carbon-13. E) atomic mass and, therefore, the same number of neutrons as carbon-12.