TLS Online TPP Program

#Question id: 1098


Which of the following is the most plausible explanation for why an animal cell would be unable to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?

#Unit 4. Cell Communication and Cell Signaling
  1. inactivation of calcium-gated ion channels in the cell membrane

  2. excessive transport of calcium from the cytosol into the endoplasmic reticulum

  3. insufficient ATP levels in the cytosol

  4. insufficient levels of protein kinase in the cell

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TLS Online TPP Program

#Question id: 595

#Unit 1. Structure and Function of Biomolecules

It is difficult to determine either Km or Vmax from a graph of velocity vs. substrate concentration because

TLS Online TPP Program

#Question id: 596

#Unit 1. Structure and Function of Biomolecules

The reason to rewrite the Michaelis-Menten equation (such as the Lineweaver-Burk plot) is to

TLS Online TPP Program

#Question id: 597

#Unit 1. Structure and Function of Biomolecules

The Km values for enzyme reactions such as A + B → C + D

TLS Online TPP Program

#Question id: 598

#Unit 1. Structure and Function of Biomolecules

Which might be a method used for distinguishing among several mechanistic possibilities in a multi-substrate reaction?

TLS Online TPP Program

#Question id: 599

#Unit 1. Structure and Function of Biomolecules

In a certain enzyme-catalyzed reaction the following steps occur:

1. A phosphate group on substrate A is transferred to a side chain of an active site residue of the enzyme.

2. The dephosphorylated form of substrate A dissociates from the enzyme.

3. Substrate B enters the active site and is phosphorylated with simultaneous regeneration of the enzyme in its original form.

What kind of kinetic mechanism is described?

TLS Online TPP Program

#Question id: 600

#Unit 1. Structure and Function of Biomolecules

Two substances are used to produce a certain biological product in an enzyme-catalyzed reaction. It is found that both substrates must bind to the enzyme, first one, then the other before the product is produced. This is an example of a/an ________.