The bacterium E. coli requires simple organic molecules for growth and energy-it
ID: 526519 • Letter: T
Question
The bacterium E. coli requires simple organic molecules for growth and energy-it is therefore a: photoautotroph chemoautotroph lithotroph chemoheterotroph photoheterotroph. The major reason that antiparallel beta-stranded protein structures are more stable than parallel beta-stranded structures is that the latter: are in a slightly less extended configuration than antiparallel strands. have weaker hydrogen bonds laterally between adjacent strands. do not have as many disulfide crosslinks between adjacent strands. do not stack in sheets as well as antiparallel strands. have fewer lateral hydrogen bonds than antiparallel strands. Which of the following would contribute to tertiary structure? charge-charge interaction between lysine and aspartic acid hydrophobic interaction between leucine and valine disulfide bond hydrogen bond between serine hydroxyl group and amide of glutamine all of the above Which of the following explains why enzymes are extremely effective catalysts? an enzyme can convert a normally endergonic reaction into an exergonic reaction an enzyme stabilizes the transition state enzymes bind very tightly to substrates enzymes release products very rapidly an enzyme lowers the energy of activation only for the forward reaction The steady state assumption in enzyme kinetics: insures that the product of an enzymatic reaction will always be formed explains why enzymes are effective catalysts states that the formation of ES is equal to its breakdown is based upon the fact that the maximum velocity of an enzyme is very high none of the above Phosphoric acid is tribasic, with pK_a's of 2.14, 6.86, and 12.4. The ionic form that predominates at pH 3.2 is H_3PO_4+. H_2PO^- _4.Explanation / Answer
6)The bacterium E.coli requires simple organic molecules for growth and energy it is therefore
Answer: D) Chemohererotroph
7)Major reason that antiparallel B-stranded protein structures are more stable than parallel B-stranded protein structures is that ,
Answer : B) The later have weaker hydrogen bonds laterally between aducent strands
8)Which of the following contributes to the tertiary structure ,
Answer: D) Hydrogen bond between serine hydroxy group and amide of glutamine
9)Which of the following explains that the enzymes are effective catalyst ?
Answer: E) An enzyme lowers the energy of activation only for the forward reaction
10.The steady state assumption of enzyme kinetics
Answer : C)State that the formation of ES is equal to its break down
11.Phosphoric acid is tribasic with Pka,s of 2.14,6.86 and 12.4 , the ionic form that predominates at pH 3.2 is ,
Answer : A) H3PO4
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