You decide to go on vacation in the mountains, where you are staying in a cabin. Unfortunately, when you turn on the water in the cabin you smell hydrogen sulfide (H2S) gas. After some research, you find out that the H2S may be due to the presence of sulfur bacteria living in your pipes. What molecule do these bacteria use as an electron acceptor?
A. O2
B. H20
C. SO4
D. H2S
C. SO4
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A catalyst
A) requires more reactants but makes the reaction rate faster. B) increases the amount of reactants produced but does not change the rate. C) changes the rate of the reaction but does not change the end amount of products. D) changes both the rate of a reaction and the amount of the product that will be obtained as the reaction is completed.
Mud is composed of:
a. dirt and water. b. iron and diatoms. c. clay and silt. d. calcareous and siliceous ooze. e. sand and clay.
Which of the following may occupy more than 90% of a mature plant cell's volume?
a. chromoplasts b. the rough endoplasmic reticulum c. the central vacuole d. the nucleus
Researchers are interested in the genomes of prokaryotic species for all of the following reasons EXCEPT that
A. bacteria cause many diseases that affect people, plants, and animals. B. the origin of the first eukaryotic cell probably involved a union between an archaeal and a bacterial cell. C. bacteria reveal modes of infection. D. bacteria are more highly advanced than humans. E. All of the choices are reasons for studying genomes of prokaryotic species.