Microbial processes take place in
A. shallow subsurface where water flowing from the surface moves below the plant root zone.
B. zones where methane is being synthesized as a result of microbial activity.
C. regions where organic matter, originating from the Earth's surface in times past, has been transformed by chemical and biological processes to yield coal.
D. All of these choices are correct.
Answer: D
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Regulatory proteins bind to the ____ of a gene operon
a. transcription unit only b. promoter only c. operator only d. transcription unit and promoter e. operator and promoter
During exercise, the blood returning to a person's heart contains hemoglobin that is about ______ saturated.
A. 3% B. 22% C. 35% D. 75% E. 97%
Although the same cell types can be found in both primary and secondary phloem, ____ are usually more abundant in
secondary phloem. a. parenchyma b. fibers c. vessel elements d. companion cells e. sieve tube members
Tetanus vaccine contains
A) antibodies against Clostridium tetani. B) inactivated Clostridium tetani endospores. C) antibodies against Clostridium tetani endospores. D) fragments of Clostridium tetani cell walls. E) inactivated tetanospasmin.