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TLS Online TPP Program

#Question id: 13216

Which statements is INCORRECT about this figure?


#Unit 6. System Physiology – Plant
  1. If the concentration of potassium chloride is higher in compartment A ([KCl]A > [KCl]B), potassium and chloride ions will diffuse at a higher rate into compartment B
  2. If membrane are more permeable to K+ tham to Cl-,  K+ will diffuse out of the cell (compartment A ) faster than Cl–, causing the cell to develop a negative electric charge with respect to the medium
  3. Diffusion of K+ would carry charges across the membrane until the membrane potential balanced the concentration gradient, Transport would then be at equilibrium, even though the concentration gradients were unchanged
  4. If membrane are more permeable to K+ tham to Cl-,  K+ will diffuse out of the cell (compartment A ) faster than Cl–, causing the cell to develop a positive electric charge with respect to the medium
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TLS Online TPP Program

#Question id: 10310

#Unit 6. System Physiology – Plant

Which of the following enzyme in the kreb’s cycle function as an allosteric enzyme found in matrix space?
TLS Online TPP Program

#Question id: 1287

#Unit 4. Cell Communication and Cell Signaling

Biological roles of proteoglycans and hyaluronan include all of the following, except:
TLS Online TPP Program

#Question id: 18079

#Unit 9. Diversity of Life Forms

Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs? 
1. Sporophyte embryo 2. female gametophyte 
3. egg cell                 4. megaspore 
TLS Online TPP Program

#Question id: 1255

#Unit 4. Cell Communication and Cell Signaling

Following statements are regarding to the mechanism of action of cholera toxin.

A. cholera toxin is a homodimeric protein, target G proteins, interfering with normal signaling in host cells.

B. cholera toxin associates with a small G protein, known as ARF6.

C. association with ARF6 activates cholera toxin, which catalyzes the transfer of ADP-ribose from NAD+ to the critical Arg residue in the P loop of the alpha subunit of Gs.

D. ADP-ribosylation blocks the GEF activity of Gs and thereby renders Gs permanently inactive.

E. This results in continuous activation of the adenylyl cyclase of intestinal epithelial cells, chronically high cAMP, and active PKA dephosphorylates the CFTR Cl- channel and a sodium-proton exchanger in the intestinal epithelial cells.

Which of the following combination is correct?
TLS Online TPP Program

#Question id: 1399

#Unit 4. Cell Communication and Cell Signaling

Loss-of-function mutations in which of the following genes typifies colorectal carcinomas?

a. myc              b. K-ras                       c. p53              d. APC