TLS Online TPP Program

#Question id: 2003


The number of MHC protein combinations possible in a given population is enormous. However, an individual in that population has only a couple of MHC possibilities. Why?

#Unit 4. Cell Communication and Cell Signaling
  1. The MHC proteins are made from several different gene regions that are capable of rearranging in a number of ways.

  2. MHC proteins from one individual can only be of class I or class II.

  3. Each of the MHC genes has a large number of alleles, but each individual only inherits 2 for each gene.

  4. Once a B cell has matured in the bone marrow, it is limited to two MHC response categories.

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TLS Online TPP Program

#Question id: 628

#Unit 1. Molecules and their Interaction Relevant to Biology

At fixed substrate concentration, which of the following equation is correct for Dixon plot

TLS Online TPP Program

#Question id: 629

#Unit 1. Molecules and their Interaction Relevant to Biology

In the presence of a fixed concentration of a competitive inhibitor, which of the following would best characterize an enzyme-catalyzed reaction when the concentration of the substrate is increased?

TLS Online TPP Program

#Question id: 630

#Unit 1. Molecules and their Interaction Relevant to Biology

In case of competitive inhibition, plots of Km against [Io] fixed [Eo] have

TLS Online TPP Program

#Question id: 631

#Unit 1. Molecules and their Interaction Relevant to Biology

Two curves showing the rate versus substrate concentration are shown below for an enzyme-catalyzed reaction. One curve is for the reaction in the presence of substance X. The other curve is for data in the absence of substance X. Examine the curves and tell which statement below is false.

TLS Online TPP Program

#Question id: 633

#Unit 1. Molecules and their Interaction Relevant to Biology

An amino acid transporter protein is responsible for the transport of a specific amino acid across a membrane. The KI values of several competitive inhibitors of the amino acid transporter are shown above. Based on these data, which of the following is most likely the amino acid transported by this protein?

TLS Online TPP Program

#Question id: 634

#Unit 1. Molecules and their Interaction Relevant to Biology

An enzyme has a Vmax of 50 micromol product formed (minute x mg protein)-1 and a Km of 10 microM for the substrate. When a reaction mixture contains the enzyme and 5 microM substrate, which of the following percentages of the maximum velocity will be closest to the initial reaction rate?