Question

This quad-part question (A,B,C,D) focuses upon E. Coli where I need to understand this material for review up into the week of exams. First one who answers correctly & promptly will get a thumbs-up & comment of my appreciation!

A. Which molecule is secreted by an E. coli cell and may have useful activity beyond the outer membrane?

a. Peptidoglycan b. Nitrate c. Beta-Galactosidase

B. In E. coli metabolism, what is taken up from the environment and used as an electron source during respiration?

a. Nitrate b. Water c. Oxygen d. Organic Carbon

C. How many carbon atoms long would a fatty acid have to be to cause as many completions of the TCA cycle as occur from catabolism of one glucose molecule?

~~~~~~~~ANSWER SHOULD BE IN NUMERICAL FORMAT (e.c. 67)~~~~~

Please Note: I have already pondered the guess of 67 for this answer, but my teacher remains to tell me it's incorrect and to rethink it again**

	D. Which pathway(s) are most likely active in a growing E. coli population in the large intestine? Choose all that apply.

**I have already met with my teacher to see if my initial guess of both {}Embden-Mayerhoff Pathway & {}Fermentation, but says to rethink and try again....**

{}Embden-Mayerhoff Pathway
{}Pentose Phosphate Pathway
{}Tricarboxylic Acid Pathway

{}Fermentation

{}Electron Transport Chain
.