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BCHM 307 Quiz 3 All Questions100% Solved with Verified Solutions
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BCHM 307 Quiz 3 All Questions100%Solved with Verified Solutions
An extremely efficient enzyme has a _____ Km and a _____ kcat. - Answer small; large
Some irreversible inhibitors are called _____ because they bind to the active site of the
enzyme and begin the catalytic process, just like a normal substrate. - Answer suicide
substrates
The catalytic constant, or kcat, is also known as the _____. - Answer turnover number
When a substrate and enzyme interact, the first chemical species formed is _____. -
Answer enzyme-substrate complex
Which of the following types of inhibition can be reversed by addition of more
substrate? - Answer competitive inhibition
For a reaction A + B → C, if [B] is much larger than [A] so that [B] essentially remains
constant over the course of the reaction, the kinetics will be _____. - Answer pseudo
first-order
Which of the following is true about enzymes? - Answer enzyme activities can often be
regulated
Which of the following statements regarding allosteric enzymes is true? - Answer -
they are generally found at regulatory sites in metabolic pathways
, -a plot of velocity versus [substrate] often yields a sigmoidal curve
-they are subject to regulation by both positive and negative effectors
-they are always oligomeric
A reversible inhibitor that binds to a site other than the active site regardless of whether
or not the substrate is bound is a _____. - Answer noncompetitive inhibitor
A reversible inhibitor that only affects multisubstrate enzymes and binds to the enzyme
only after one substrate has bound is a _____. - Answer uncompetitive inhibitor
What two molecules are used in the synthesis of sphingosine? - Answer palmitic acid
and serine
Which of the following terms describes all glycerophospholipid? - Answer amphipathic
Which of the following aspects of membrane protein movement is explained by the
fluid mosaic model? - Answer proteins that are mobile only in a small area are
sequestered by proteins attached to the cytoskeleton
The carbohydrate portion of a membrane spanning glycoprotein is found _____. -
Answer only on the extracellular side of the membrane
As temperatures grow colder with the onset of winter, animals will adapt by changing
the fatty acid composition of cell membranes. What characteristics of fatty acids will
be seen? - Answer shorter chain with greater unsaturation
Which of the following is the primary building block for the synthesis of molecules
like cholesterol or ubiquinone? - Answer isoprene
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