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Question: The pyrimidine and purine bases are nitrogen containing compounds. What is the source of nitrogen for these two ring systems? In most examples, the reaction to add nitrogen to the growing ring structure requires an activation of a carbon atom. What is the common mechanism used to carry out this activation? Be able to recognize this when you see a reaction of this sort. Question: The activity of ribonucleotide reductase is regulated in two ways: its total activity is controlled and its substrate specificity is controlled. What are the metabolites that regulate both of these activities? How does the cell balance the concentration of the various deoxynucleotide diphosphates? What is the principal similarity between ribonucleotide reductase and the nitrogenase complex?
Explain the difficulities of living in the epipelagic? Discuss and describe three adaptations for dealing with the difficulities you described to answer the question above.
Suppose after washing your hands, you leave ten bacterial cells on the new bar of soap. You next decide to do a plate count of the soap after it is left in the soap dish for 24 hours. You dilute 1g of the soap 1:10 and plate it on a standard plate co..
Suppose that you are a scientist sequencing the genomes of organisms. You start two new projects, one sequencing the genome of an amoeba.
Explain why is potassium not equally distributed across the membrane and why is cell negative on the inside?
2-types of signals have been implicated in metaphase checkpoint arrest. Think about the results of a recent experiment in which the unattached kinetochore of a monoattached chromosome was destroyed by a laser beam.
One haploid strain is unable to synthesize uracil but not unable to synthesize leucine, while another haploid strain is able to synthesize uracil but not leucine.
Over the long period of time that life has existed on Earth, there have been number of important or significant innovations including endosymbiosis to create mitochondria and chloroplasts.
Compare and contrast signaling by neurons which secret neurotransmitters at synapses to signaling carried out by endocrine cells, that secretes hormones into the blood, define the relative advantage of the two mechanisms.
The overall reaction of aerobic respiration of glucose is summarized as.
A man with a chin dimple and a non dimpled woman produce eight children, all having the chin dimple. Can you be certain of the man's genotype? Why or why not? What genotype is more likely, and why gives reason.
Assume that in other ltxnsp cells the HCO 3 - in the ICF = 1mM, 10mM in the ECF, and is passively distributed across the membrane.
Explain the changes in the mother's vital signs after birth. What happens to the BP? What BP pattern would indicate shock from blood loss?
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