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Purines and pyrimidines play crucial roles in cellular energy systems signaling and in the production of DNA and RNA. Purines and pyrimidines can either be synthesized de novo or from normal catabolism, via a salvage pathway. Uric acid is the end product of the purine catabolism, and Citric Acid cycle intermediates are the products of pyrimidine catabolism.
question:* What happens when there are errors in the metabolism of purines and/or pyrimidines?* How is the body affected?* What kinds of errors can affect purine and pyrimidine metabolism? How do these errors affect these two processes?
Suppose a DNA mutation changes the consensus sequence at the -35 location so that sigma factor does not bind there as well. Explain how a mutation could inhibit the binding of sigma factor to DNA
Discuss and define motor unit and describe how motor units function in recruitment and in maintaining muscle tone. Explain the different types of skeletal muscle fibers.
Which of the following processes is an example of positive feedback? a. High CO2 blood levels stimulate respiration which decreases blood CO2 levels b. High blood glucose levels stimulate insulin release.
What is the water shed and annual surface runoff for the following.
What fraction of demes in each set is likely to become fixed for allele A1 versus A2. Explain the differences in head movement available to fish.
What characteristics distinguish prokaryotic and eukaryotic cells?
Assayed for LDH activity were five uL of a sample that was diluted 6 to 1. The activity in the reaction vessel, which has a volume of 1 mL, is 0.10 U.
The following Punnett square shows the inheritance of the sickle cell and SRY genes, with X representing the X chromosome with no SRY gene and Y representative the Y chromosome which does have an SRY gene. Complete the Punnett square.
What are the primary differences between animal cells, plant cells, and bacteria cells? What chacteristics do they share.
How did Santiago Ramon y Cajal (1906) famous neuroanatomical drawings of the nervous system contribute to our current understanding of the cellular wiring of the nervous system?
What affect might you expect the precipitation of hemoglobin S and the subsequent cell sickling to have on oxygen delivery in an individual with sickle cell disease?
Construct-diagram a pediigree that clearly demonstrates the x-linked recessive pattern of inheritance. Use a made up trait and family history containing three generation and between 18 and 20 individuals with equal numbers of females and males in ..
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