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TLS Online TPP Program

#Question id: 921

Which of the following statements concerning the B oxidation of fatty acids is true?

#Life Sciences

  1. About 1,200 ATP molecules are ultimately produced per 20-carbon fatty acid oxidized.

  2. One FADH2 and two NADH are produced for each acetyl-CoA.

  3. The free fatty acid must be carboxylated in the B position by a biotin-dependent reaction before the process of B oxidation commences.

  4. The free fatty acid must be converted to a thioester before the process of B oxidation commences.

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TLS Online TPP Program

#Question id: 558

#Biochemistry

In a plot of l/V against 1/[S] for an enzyme-catalyzed reaction, the presence of a competitive inhibitor will alter the:
TLS Online TPP Program

#Question id: 559

#Biochemistry

In competitive inhibition, an inhibitor:
TLS Online TPP Program

#Question id: 560

#Biochemistry

Vmax for an enzyme-catalyzed reaction:
TLS Online TPP Program

#Question id: 561

#Biochemistry

Enzyme X exhibits maximum activity at pH = 6.9.  X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4.  One likely interpretation of this pH activity is that:
TLS Online TPP Program

#Question id: 562

#Biochemistry

Phenyl-methane-sulfonyl-fluoride (PMSF) inactivates serine proteases by binding covalently to the catalytic serine residue at the active site; this enzyme-inhibitor bond is not cleaved by the enzyme.  This is an example of what kind of inhibition?
TLS Online TPP Program

#Question id: 564

#Biochemistry

A good transition-state analog: