Help with a couple of questions

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djiang87
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Help with a couple of questions

Post by djiang87 » Wed Nov 04, 2009 8:56 pm

Hi im studying for my finals and i have a few revision questions im not too sure about or would like some elaborating from what i have. Any help is much appreciated.

Q: Streptococcus is a fermentative bacterium. Explain why, even under ideal conditions, this bacterium grows only slowly.
I think the answer to this lies with the fact that fermentation has little energy yeild - but im not too sure how to answer it correctly.

Q: Give examples of molecules that serve as the final electron acceptor in anaerobic respiration. To what are these molecules converted when they accept electrons
Nitrates and the final electron acceptor are nitrites?

Q:Name and compare two microorganisms that are utilised in production of bioethanol
i havent the slightest clue about this

Q: Explain the central role of pyruvate in the metabolism of chemoheterotrophic bacteria.
My guess is that pyruvate can be converted to carbohydrates or fats which can be used by chemoheterotrophs as a source of carbon.

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mith
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Post by mith » Thu Nov 05, 2009 4:42 am

bioethanol is beer.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

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canalon
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Post by canalon » Thu Nov 05, 2009 2:27 pm

mith wrote:bioethanol is beer.

or wine :)
And look at the difference between beers, notably look at Lambics (belgian beers which are fermented with wild yeasts)
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

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JackBean
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Post by JackBean » Thu Nov 05, 2009 4:52 pm

I don't think, that in this case they mean alcohol bevarages by bioethanol :roll:
More likely the "new, super ecological" fuel ;)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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mith
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Post by mith » Thu Nov 05, 2009 5:35 pm

wild yeasts? doesn't that run the risk of spoiling them?
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

djiang87
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Post by djiang87 » Thu Nov 05, 2009 10:12 pm

I was looking through my notes and i think the bioethanol they are referring to is the one that jackbean mentioned, about new ecological fuels. It says it uses some of the Clostridium species. So the answer the question just naming two different species of Clostridium that can produce bioethanol should be enough i hope, i just gotta find out which ones can be used.

Another thing, any thoughts on the other questions?

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JackBean
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Post by JackBean » Fri Nov 06, 2009 8:24 am

1) correct
4) I think it has kind of central role in metabolism of all kinds of life ;)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.

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