The biosafety level (BSL) for a clinical microbiology laboratory working with potentially airborne pathogens, such as tuberculosis bacteria, is
A) BSL-1.
B) BSL-2.
C) BSL-3.
D) BSL-4.
C
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The person who described the "wee animalcules" was
A) Robert Hooke. B) Antoni van Leeuwenhoek. C) Louis Pasteur. D) Ferdinand Cohn.
Most cultivated bananas are triploid. How could these be generated from diploid parent banana plants?
A. nondisjunction in mitosis followed by normal fertilization B. All of these answer choices are different options for creating triploid cells. C. fertilization of a haploid egg by a haploid sperm D. fertilization of a diploid somatic cell by a haploid sperm E. nondisjunction in meiosis followed by normal fertilization
Lenticels function to:
a. protect undeveloped embryonic shoots. b. permit gas exchange through the periderm. c. support leaves and flowers. d. absorb water and dissolved nutrient minerals. e. anchor a plant in the ground.
Which of the following is found in the intestine of termites and produces enzymes needed to digest wood particles?
A. Giardia B. Nyctotherus C. Trichomonas D. Trichonympha