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TLS Online TPP Program

#Question id: 1245

Many PTB-containing proteins act as docking sites for multiple proteins. If these proteins are involved in the RTK signal transduction pathway, they most likely:

#Unit 4. Cell Communication and Cell Signaling

  1. contain GRB2 domains.

  2. are involved in autophosphorylation of the RTK.

  3. are phosphorylating the receptor and the docking protein.

  4. are adopting a different conformation (shape) to expand the pathways affected by ligand binding.

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TLS Online TPP Program

#Question id: 2223

#Unit 2. Cellular Organization

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed.

 Which line in the graph represents the bag that contained a solution isotonic to the 0.6 M solution at the beginning of the experiment?
TLS Online TPP Program

#Question id: 2224

#Unit 2. Cellular Organization

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed.

Which line in the graph represents the bag with the highest initial concentration of sucrose?
TLS Online TPP Program

#Question id: 2225

#Unit 2. Cellular Organization

Five dialysis bags, constructed of a type of membrane that is permeable to water and impermeable to sucrose, were filled with various concentrations of sucrose and then placed in separate beakers containing an initial concentration of 0.6 M sucrose solution. At 10-minute intervals, the bags were massed (weighed), and the percent change in mass of each bag was graphed.

Which line or lines in the graph represent(s) bags that contain a solution that is hypertonic at 50 minutes?
TLS Online TPP Program

#Question id: 2226

#Unit 2. Cellular Organization

What will happen to a red blood cell (RBC), which has an internal ion content of about 0.9%, if it is placed into a beaker of pure water?
TLS Online TPP Program

#Question id: 2227

#Unit 2. Cellular Organization

Which of the following statements is most likely true of a protein that cotransports glucose and sodium ions into the intestinal cells of an animal?
TLS Online TPP Program

#Question id: 2228

#Unit 2. Cellular Organization

Proton pumps are used in various ways by members of every domain of organisms: Bacteria, Archaea, and Eukarya. What does this fact most probably mean?