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Why are the phylogenetic relationships for Amphibia so contentious? How does this contrast with the challenges for determining phylogenetic relationships of Lepidosauria? Provide three examples of species from different families supporting your argument for Amphibia and for Lepidosauria (Sphenodontia/ Rhynchocephalia & Squamata).
A protein has a molecular mass of 200 kDa as determined by gel filtration (=native molecular weight). When separated by SDS-PAGE (without a reducing agent present) only one polypeptide appeared with a mass corresponding to 100 kDa.
A woman with blood type AB marries a man with blood type O. What is the probability that they will have a child with blood type O? Can someone explain to me why?
Determine what is the most common mechanism for repairing damage to DNA? Individuals with xeroderma pigmentosum inherit a faulty DNA repair mechanism.
You have measured the absorption of pNP created by acid phosphatase after 12.5 minutes of reaction to be 0.188. The reaction occurred in a 500. µL volume into which was added 0.200 mL of 0.400 mg/mL WAP.
An enzyme and its substrate are combined in a test tube but no product is formed. Another molecule is added to the tube, and now the product is formed at the normal rate. Give 2 reasons.what type of inhibition is working on the substrate.
Use human communication methods as an analogy for how cells communicate with one another. How are some of the ways cells communicate similar to the ways we communicate with other people or with an organization? How are they different?
The fist clinical trial that assess stem cells in transplantation setting is using HSCs for the treatment of heart attack. Why are HSCs used and not cardiac stem cells?
Which RNA polymerase is used in Lac operon expression? Which one is used in eukaryotic gene expression?
Give thoughtful, researched answers to the following items. Points will be earned for completeness and accuracy. Provide sources in an appropriate citation format.
what is the progression of the nerve cord as it developed from the simplest forms to where it is now in humans?
Thiol proteases are a widely distributed group of proteases with a mechanism somewhat similar to that of the serine proteases (the family of enzymes which includes chymotrypsin).
diagram the procedure and dilution scheme that you would follow. indicate which plate is likely to be the best plate to count.
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