TLS Online TPP Program

#Question id: 5683


There may be an important connection between sperm translocation and capacitation. Which of the following option is correct explanation of above statement?

#Unit 5. Developmental Biology
  1. The influx of bicarbonate ions (and possibly other ions) alkalinizes the sperm, raising its pH.

  2. before entering the ampulla of the oviduct, the uncapacitated sperm bind actively to the membranes of the oviduct cells in the narrow passage (the isthmus) preceding it.  This binding is temporary and appears to be broken when the sperm become capacitated.

  3. The cholesterol efflux from the sperm cell membrane is thought to change the location of its “lipid rafts,” isolated regions that often contain receptor proteins that can bind the zona pellucida and participate in the acrosome reaction.

  4. Capacitation is a transient event but translocation is not.

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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?