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TLS Online TPP Program

#Question id: 1373

Following statements are regarding to cholera toxins which can affect the junction’s activity.

a. Toxins produced by Vibrio cholerae, the enteric bacterium that causes cholera, alter the permeability barrier of the intestinal epithelium by altering the composition or activity of gap junctions.

b. Vibrio cholerae also releases a protease that disrupts tight junctions by degrading the extracellular domain of occludin.

c. Toxin-induced changes in tight-junction permeability (increased paracellular transport) and in protein-mediated ion pumping (decreased transcellular transport) can result in massive losses of internal body ions and water into the gastrointestinal tract, which in turn leads to diarrhea and potentially lethal dehydration.

d. Toxin-induced changes in tight-junction permeability (decreased paracellular transport) and in protein-mediated ion pumping (increased transcellular transport) can result in massive losses of internal body ions and water into the gastrointestinal tract, which in turn leads to diarrhea and potentially lethal dehydration.

Which of the following statements are correct?

#Unit 4. Cell Communication and Cell Signaling

  1. a, b and c

  2. a, b and d

  3. a only

  4. b only

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TLS Online TPP Program

#Question id: 7704

#Unit 9. Evolution & Diversity of Life Forms

The best classification system is that which most closely ________.
TLS Online TPP Program

#Question id: 7705

#Unit 9. Evolution & Diversity of Life Forms

 Based on this tree, which statement is correct?
TLS Online TPP Program

#Question id: 7751

#Unit 5. Developmental Biology

Ultrastructural studies have led to the characterization of two distinctive cytological
pathways of PCD in plants;
I) Vacuolar-type PCD
II) Hypersensitive response-type (HR-type) PCD
a) cytosol and all its organelles, including the plasma membrane, are completely brokendown
b) The vacuole loses water, resulting in marked cell shrinkage, contraction from the cell wall,
and nuclear DNA degradation
c) PCD occurs in leaves in response to microbial attack
d) cell wall is either partially or completely digested as well, as in endosperm tissue
e) Continued water loss from the cytosol leads to the breakdown of the plasma membrane
and the release of residual cellular contents into the apoplast
Given characterization of PCD pathway match with its type PCD?
TLS Online TPP Program

#Question id: 7752

#Unit 5. Developmental Biology

The autophagy pathway included____
a) the catabolic mechanism that delivers cellular components to lysosomes, where they are degraded
b) Autophagy protects the cell from the harmful or lethal effects of damaged or unnecessary proteins and organelles
c) During starvation, the autophagic breakdown and recycling of cellular components also
ensure cellular survival by maintaining cellular energy levels
Which of the following are the correct prediction about autophagy is true?
TLS Online TPP Program

#Question id: 7753

#Unit 5. Developmental Biology

The best-studied type of plant autophagy, specialized organelles called autophagosomes enclose the cytoplasmic components and fuse with the vacuole, this is called
TLS Online TPP Program

#Question id: 7754

#Unit 5. Developmental Biology

In autophagy, the endoplasmic reticulum (ER) first gives rise to a cup-shaped, membranous cisterna called the