Bacteria, ect.

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Bacteria, ect.

Post by ckjones » Wed Jun 29, 2005 9:53 pm

I have a few ?'s that i need some help on someone please help me.......

1) Some bacteria that are adapted to live without oxygen combine carbon dioxide and hydrogen to produce:
a) lactic acid
b) methane
c) pyruvic acid
d) glucose

2) In respiration, the final electron acceptor in the electron transport chain is:
a) oxygen
b) ATP
c) hydrogen ions
d) H2O

3) Which of the following monitors a cell's progress from phase to phase during the cell cycle?
a) a series of enzymes
b) micro tubules
c) lipid molecules
d) protein molecules

Because cells have a watery environment both inside and outside, the polar ends of the phospholipids in the plasma membrane form ________ layers.
a) several
b) mosaic
c) double
d) single

If you will please explain to me the answer so that I can better understand.......Thanks
Last edited by ckjones on Thu Jun 30, 2005 12:30 am, edited 2 times in total.

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Post by mith » Wed Jun 29, 2005 10:52 pm

Sounds like you didn't read the book or the book was written by trolls.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;

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Location: Somewhere between those molecules

Post by chemistry_freako » Thu Jun 30, 2005 2:40 pm

Last question's a very obvious one - heard of the phospholipid bilayer, or fluid mosaic model? =D


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Post by EmmVeePee » Thu Jun 30, 2005 5:19 pm

1. Think what happens to your body when you work out hard, what builds up due to lack of Oxygen?

2. The molecule furhter down the line needs to have a higher electronegativity than the last. So the last one needs to have a very high electronegativity. Which atom/molecule has a high electronegativity in the list?

3. I actually don't know this one, but if I had to guess I'd say enzymes.

4. You should know this.

I take it, AP Biology summer work?
Undergraduate, Microbiology
Pennsylvania State University

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