Destroyer BIO Questions

[au5233]

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Hey Everyone,

so I have a few questions about the bio in Destroyer.

In regards to 180 (a), why would heterotrophs preceed autotrophs? Don't heterotrophs rely on organic molecules made by autotrophs? So I thought autotrophs would come first, such as blue-green bacteria and other chemoautotrphs, since they could use photosynthesis with elements such as H2S, etc that were part of the primordial soup of the early earth?

Also 182 (e), according to Wikipedia and some other sources, both salt bridges and disulfide bonds are broken in alosteric regulation, so I dont really know why this answer choice is wrong...any feedback?

Finally, in regards to Algae, what the H*LL are these little guys classified as?? Romano is listing them as plants, I learnt them as "Plant like PROTISTS" (which i verified with my bio book). I think Schuams has them under plants.

I know that blue-green algae are listed under Monera and considered cyanobacteria, but what about red, brown, and green algae? Again, my big text book by Raven and Johnson entitled "BIOLOGY" has them under Kingdom protists...its just all very contradictory.


Please give me any feedback that you guys have on this.

Thanks!

 

[au5233]

Well in answer to one of my own questions, I'm going to have to say Detroyer is wrong. I just referenced by "Brock Biology of Microorganisms" by Madigan and Martinko and it states algae are indeed Protists, not plants...

 

[pbure]

Well in answer to one of my own questions, I'm going to have to say Detroyer is wrong. I just referenced by "Brock Biology of Microorganisms" by Madigan and Martinko and it states algae are indeed Protists, not plants...

thats a grey area..there are conflicting theories on that. as such i doubt the dat will explicitly ask whether they are protists or plants.

 

[au5233]

...just another thing I found in my microbio text book in regards to the Origin of Life. It says that evidence for Microbial Life on the early earth is from primitive fossil remains of Stromatolites, which have been concluded were formed by filamentous phototrophic bacteria.

So if they were phototrophic, weren't they likely autotrophs? You can have phototrophic heterotrophs, but they require organic carbon, which would have been made by a autotrph correct?

 

[pbure]

...just another thing I found in my microbio text book in regards to the Origin of Life. It says that evidence for Microbial Life on the early earth is from primitive fossil remains of Stromatolites, which have been concluded were formed by filamentous phototrophic bacteria.

So if they were phototrophic, weren't they likely autotrophs? You can have phototrophic heterotrophs, but they require organic carbon, which would have been made by a autotrph correct?

just know that anaerobic heterotrophs came first...autotrophic life resulted from a mutation that made it possible to conduct primitive forms of photosynthesis. which came in handy because life would have ceased without a viable source of autotrophic nutrition

 

[cskpeter]

In regards to 180 (a), why would heterotrophs preceed autotrophs? Don't heterotrophs rely on organic molecules made by autotrophs? So I thought autotrophs would come first, such as blue-green bacteria and other chemoautotrphs, since they could use photosynthesis with elements such as H2S, etc that were part of the primordial soup of the early earth?

I cannot back this up by referencing a book but I am pretty sure the first form of life is "believed" to be anaerobic heterotrophs. They did not feed on autotrophs or their products but on organic polymers which were synthesized as in primodial soup. This makes sense to me because autotrophs must have more complicated structures for photosynthesis and it must have taken longer time for them to evolve.

Yes, the stromatolites are the earliest fossil evidence of primitive prokaryotic life but it does NOT mean they are the first form of life.

 

[TheWiredNerv]

algae are considered to be either protists or monerans (bacteria) by modern classification. To tell you the truth, most scienctists think modern taxonomy is archaic and useless and primarilly used for just a broad soarting system. Many believe a new system must be adopted that more closely groups orgaisms together.