Question 1 How many carbon atoms long would a fatty acid have to be to cause as

Question

Question 1 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? Fill in a numeral (for example, 1 not one, and 57 not fifty seven) (and just the numeral, nothing else) Question 2 Which pathway(s) are most likely active in a growing E. coli population in the large intestine? Choose all that apply. 1. Electron transport chain 2. Fermentation 3. Embden-Meyerhoff pathway 4. Pentose phosphate pathway 5. Tricarboxylic acid pathway Question 3 Which molecule is secreted by an E.colicell and may have useful activity beyond the outer membrane? A. nitrate reductase OB. peptidoglycan 0 C, beta-galactosidase 0 D. nitrate

Explanation / Answer

1. 4

One glucose molecule = 2 Acetyl Co-A

2 Acetyl Co-A = 4 Carbon atoms = Butanoic acid/Butyric acid

2. Anaerobic conditions are found in the large intestine. So, E coli can perform

i. EMP pathway

ii. Fermentation

iii. PPP

3. Option D is correct.

Peptidoglycan layer is located in between the outer lipid membrane and plasma membrane.

Nitrate reductase is a membrane-bound enzyme.

Beta-galactosidase is a cytosolic enzyme.

4. Option C is correct.

Oxygen and nitrate are electron acceptors.

Water is formed when oxygen accepts electrons and protons from NADH + H+

Organic electron donor = Formate

5. Option D is correct.

Alpha-ketoglutarate is produced in the TCA cycle as well as in amino acid metabolism.

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