A researcher lacked the necessary equipment to measure methane production so instead monitored CO2 concentration as the unknown archaeon grew and produced methane. Why might CO2 NOT decrease but methane still increase?
A) An alternative carbon source such as methanol was used.
B) CO2 is not a carbon source used by methanogens.
C) CO2 was used an electron donor but not as a carbon substrate.
D) Methanogenic Archaea containing carboxysomes likely made measuring small losses of CO2 difficult to conclude.
Answer: A
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The maximum number of bonds that can be formed by an atom:
A. is dependent on the valence of that atom. B. is dependent on the number of unpaired electrons in its outer shell. C. can be made up of a combination of single and double bonds. D. is atom specific; for example, carbon can form four bonds, whereas oxygen forms two. E. All of these choices are correct.
For which of the following nutrients does a deficiency not result in leaf chlorosis?
a. Nitrogen. b. Magnesium. c. Iron. d. Zinc. e. Boron.
Briefly describe the shift in rainfall patterns and the consequences that occurred during the 1997-1998 El Niño season. What will be an ideal response?
Rank these plant types from those that undergo senescence soonest after seed germination to those that live longest.1. herbaceous perennial2. biennial3. annual4. woody perennial
Fill in the blank(s) with the appropriate word(s).