Two Questions: What, if anything, is wrong with the following statement: “When NaCl is dissolved in water, the water molecules closest to the ions will tend to orient themselves so that their oxygen atoms point toward the sodium ions and away from the chloride ions.”  The drug thalidomide was once prescribed […]

Question: Prions are “infectious” proteins that will alter the structure of wild type proteins and turn them prionic. The protein degradation pathway involving the Proteasome works because this complex recognizes proteins tagged with Ubiquitin. Ubiquitin has to be added to a Leucine amino acid within the protein. Explain why this mechanism […]

Question: The ability of urea diffusing across membranes of red blood cells … I was told that urea can easily penetrate the membrane as they are not present in high concentration inside the cell. If I am mistaken, isn’t urea a large polar molecule? I thought they would be impermeable to […]

A species of tree has a very large genome consisting of 2.0×10^10 base pairs of DNA per diploid genome. Assume that each diploid cell contains 10 chromosomes of similar length. a. assume that this tree’s DNA polymerases can synthesize 2×10^4bp/minute and th origins of replication are evenly spaced on each […]