The bacterium E. coli requires simple organic molecules or growth and energy - i

Question

The bacterium E. coli requires simple organic molecules or growth and energy - it is therefore a: A. photoautotrophy B. chemoautotrophy C. lithograph D. chemoheterotroph E. photoheterotroph. The major reason that antiparallel beta stranded protein structures are more stable than parallel beta-stranded structures is that the latter: A. are in a slightly less extended configuration than antiparallel strands. B. have weaker hydrogen bonds laterally between adjacent strands. C. do not have as many disulfide crosslink's between adjacent strands. D. do not stack in sheets as well as ant parallel strands. E. have fewer lateral hydrogen bonds than antiparallel strands. Which of the following would contribute to tertiary structure? A. charge-charge interaction between lysine and aspartic acid B. hydrophobic interaction between leucine and valine C. disulfide bond D. hydrogen bond between serine hydroxyl group and amide of glutamine E. all of the above Which of the following explains why enzymes are extremely effective catalysts? A. an enzyme can convert a normally endergone reaction into an exergonic reaction B. an enzyme stabilizes the transition state. C. enzymes bind very tightly to substrates D. enzymes release products very rapidly E. an enzyme lowers the energy of activation only for the forward reaction The steady state assumption in enzyme kinetics: A. insures that the product of an enzymatic reaction will always be formed B. explains why enzymes are effective catalysts C. states that the formation of ES is equal to its breakdown D. is based upon the fact that the maximum velocity of an enzyme is very high E. none of the above Phosphoric acid is triadic, with pK'_a s of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is A .H_3PO_4. B. H_2 PO^-_4.

Explanation / Answer

6) E coli is heteroautotroph as it obtain it's food from a different source.

7) the main reason is that parallel bita stranded structures are in a slightly less extended configuration than antiparallel strand.

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