28) Which process does NOT use proton motive force? A) secondary active transpor

Question

28) Which process does NOT use proton motive force? A) secondary active transport C) flagella motility D) oxidative phosphorylation E) all of the above uses proton motive force and tryptophan but lack of tyrosine. Which of the following enzyme or enzymes are subject to the feedback inhibition 29) Wild-typeE coli cells are growing in a liquid medium that contains a high concentration of phenylalanine phosphoenolpyruvate+ Erythrose-4-phosphate DAHP synthases isozymes DAHP 7818 Tyrosine Phenylalanine Tryptophan 1 - DAHP synthase that only responds to (feedback inhibited by) tyrosine 2-DAHP synthase that only responds to (feedback inhibited by) phenylalanine 3 -DAHP synthase that only responds to (feedback inhibited by) tryptophan A) 1 B) 1 and 8 C) 1 and 7 D) 2 and 8 E) 2, 3, 6, and 8 ORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 30) In general. sterols in eukaryotes and in prokaryotes regulate the flexibility of membrane at both hiek

Explanation / Answer

28. Option B is correct. Homolactic fermentation converts pyruvate molecules into ATP, water molecule and lactic acid. Fermentation does not require proton motive force rather it uses substrate level phosphorylation to produce ATP. Rest all three require proton motive force.

29. Option D is correct. Here, tyrosin is not present in the medium and thus the enzymes responsible for tyrosine production (1 and 7) will not give any feedback inhibition while tryptophan and phenylalanine are present in higher concentration and thus, enzymes responsible for the production of these both (2, 3, 6, and 8) will give feedback inhibition.

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