Most known methanogens are nonhalophilic
A) psychrophiles.
B) mesophiles.
C) thermophiles.
D) extremophiles (at either the psychrophilic or thermophilic end).
Answer: B
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Several new materials have been developed for use in the microbiology lab. These materials must be sterilized before use, but cannot withstand a temperature over 60oC and can't be exposed to water. Which method of sterilization would be applicable?
A. Oven-dry heat B. UV radiation C. Steam autoclave D. Ionizing radiation
Enzymes present in the lumen of the Golgi apparatus are responsible for modifying proteins and lipids. What is the likely origin of these enzymes?
A. free ribosomes B. the rough endoplasmic reticulum C. the smooth endoplasmic reticulum D. the cytosol
Atrazine
a. is an herbicide that has been in use for more than 40 years. b. application in the United States totals about 36 thousand metric tons annually. c. is used mostly to kill weeds in cornfields. d. contamination of soils and water is common in the American Midwest. e. fits all of these descriptions
Birds are most closely related to:
a. reptiles. b. testudines. c. mammals. d. labyrinthodonts. e. terrapins.