#Question id: 9200
#Unit 9. Diversity of Life Forms
During the inventory of bacterial genes present in the Sargasso Sea, a deep isolated area in the middle of the Atlantic Ocean, a research team concluded that at least 1,800 bacterial species were present. Based on what you might predict about the habitat structure of such an area, what kind of bacterial diversity would you expect to see in tropical coral reef waters?
#Question id: 881
#Unit 1. Molecules and their Interaction Relevant to Biology
______and ________ are the first chaperones a newly made prokaryotic protein encounters. Subsequently, many partially folded proteins are handed off to other chaperones to complete the folding process. E. coli can tolerate the elimination of_______ or________, but not both, thereby indicating that they are functionally redundant.
#Question id: 2946
#Unit 2. Cellular Organization
Which of the following occurs during anaphase A?
#Question id: 787
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following statement is INCORRECT with respect to the structure of DNA?
#Question id: 1373
#Unit 4. Cell Communication and Cell Signaling
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?