You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. This bacterium is (blank)?
Please fill blank with choices below. Please explain your choice. Thanks in advance for your help!
a) gram-negative
b) using anaerobic respiration
c) a chemoautotroph
d) a photoautotroph
e) a photoheterotroph
2007-04-07 12:16:38 · 5 answers · asked by passion2share 4 in Science & Mathematics ➔ Biology
B. Using anaerobic respiration.
A good site for this information is here:
http://helios.bto.ed.ac.uk/bto/microbes/nitrogen.htm
Go to the bottom of the page for this particular information.
2007-04-07 12:27:05 · answer #1 · answered by ecolink 7 · 0⤊ 0⤋
Remember to think about how to attack a question like this as well... You are specifically told that your medium contains an organic substrate and nitrates. Chemoautotrophs use inorganic chemical compounds for nourishment. The root "photo" refers to light, and we are not given any indication to the lack of or state of light available for growth. Being gram-negative/positive is somewhat irrelevant to the availability of oxygen or it's substrate because it is only one of many ways to categorize a microbe. Does that help?
2007-04-07 19:40:45 · answer #2 · answered by bzzzzzed 3 · 1⤊ 0⤋
b. using anaerobic respiration
There is a lack of oxygen and the medium has nitrate.
2007-04-07 19:24:53 · answer #3 · answered by puppyraiser8 4 · 1⤊ 0⤋
b) it's anaerobic. This is because anaerobic respiration occurs in the absence of oxygen.
2007-04-07 19:23:19 · answer #4 · answered by dixiechck615 3 · 1⤊ 0⤋
b) using anaerobic respiration
Good luck!
2007-04-07 19:25:21 · answer #5 · answered by ever_amused 3 · 1⤊ 0⤋