What fraction of all of the organic carbon on Earth results from microbial fixation of carbon dioxide in the oceans?

A. About 1/4
B. About 1/2
C. About 3/4
D. About 1/8


Answer: B

Biology & Microbiology

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A high concentration of chlorophyll imbedded in the plasma membrane fold of a newly discovered species of bacteria suggests a:  

A.  Chemolithoautotrophic metabolism B.  Chemoheterotrophic metabolism C.  Photoautotrophic metabolism D.  Photoheterotrophic metabolism Clarify Question · What is the key concept addressed by the question? · What type of thinking is required?   Gather Content · What do you already know about bacterial metabolism? How does it relate to the question? · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?   Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?  

Biology & Microbiology

Sketch an exponential growth curve with correctly labeled axes. Identify two organisms and the conditions under

which they might demonstrate such growth. What will be an ideal response?

Biology & Microbiology

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

Biology & Microbiology

________ use electrons from reduced inorganic or organic compounds as a source of energy and CO2 as a source of carbon.

a) Photoautotrophs b) Photoheterotrophs c) Chemoautotrophs d) Chemoheterotrophs

Biology & Microbiology