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TLS Online TPP Program

#Question id: 24434

Which of the following is correct order of proton-driven rotation of the c ring

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Arg210 rotates, displacing H+ from Asp → Proton displaces Arg210 to adjacent c subunit → Proton enters half channel on P side → Displaced H+ exits on N side → c10 ring rotates, Arg210 returns to P-side half-channel.
  2. Displaced H+ exits on N side→ Proton displaces Arg210 to adjacent c subunit → Arg210 rotates, displacing H+ from Asp → Proton enters half channel on P side→ c10 ring rotates, Arg210 returns to P-side half-channel.
  3. Proton enters half channel on P side → Proton displaces Arg210 to adjacent c subunit → Arg210 rotates, displacing H+ from Asp → Displaced H+ exits on N side → c10 ring rotates, Arg210 returns to P-side half-channel.
  4. Proton enters half channel on P side → Proton displaces Arg210 to adjacent c subunit → c10 ring rotates, Arg210 returns to P-side half-channel.→ Displaced H+ exits on N side → Arg210 rotates, displacing H+ from Asp.
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TLS Online TPP Program

#Question id: 32713

#Unit 1. Molecules and their Interaction Relevant to Biology

Match figure with their correct order of reaction
TLS Online TPP Program

#Question id: 32714

#Unit 1. Molecules and their Interaction Relevant to Biology

The existence of an enzyme-substrate complex can be experimentally demonstrated by
a. X-ray crystallography
b. ESR
c. NMR
d. Fluorimetery
TLS Online TPP Program

#Question id: 32715

#Unit 1. Molecules and their Interaction Relevant to Biology

Which model correctly represents the graph


 
TLS Online TPP Program

#Question id: 32716

#Unit 1. Molecules and their Interaction Relevant to Biology

The given relationship is known as
TLS Online TPP Program

#Question id: 32717

#Unit 1. Molecules and their Interaction Relevant to Biology

The enzyme urease enhances the rate of urea hydrolysis at pH 8.0 and 20oC by a factor of 1014. If a given quantity of urease can completely hydrolyze a given quantity of urea in 5.0 min at 20oC and pH 8.0, how long would it take for this amount of urea to be hydrolyzed under the same conditions in the absence of urease?
TLS Online TPP Program

#Question id: 32718

#Unit 1. Molecules and their Interaction Relevant to Biology

When enzyme solutions are heated, there is a progressive loss of catalytic activity over time due to denaturation of the enzyme. A solution of the enzyme hexokinase incubated at 45oC lost 50% of its activity in 12 min, but when incubated at 45oC in the presence of a very large concentration of one of its substrates, it lost only 3% of its activity in 12 min. What is correct explanation