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E. coli chromosomes in which every nitrogen atom is labeled (that is, every nitrogen atom is the heavy isotope 15N instead of the normal isotope 14N) are allowed to replicate in an environment in which all the nitrogen is 14N. Using a solid line to represent a heavey polynucleotide chain and a dashed line for a light chain, sketch each of the following descriptions:
a. The heavy parental chromosome and the products of the first replication after transfer to a 14N medium, assuming that the chromosome is one DNA double helix and that replication is semi-conservative.
Albinism is a rare genetically inherited trait that is only in phenotype of homozygous recessive individuals. The most characteristic symptom is a marked deficiency in the skin and hair pigment melanin.
If a man with a red-colorblindness (a sex-linked trait) marries a normal woman, would you expect to see trait expressed in their children.
Explain how multiple signals may travel from the dendrites of a single neuron to the axon terminal of that same neuron.
A female rabbit with hemophilia, rickets and a tail was mated to a male rabbit that did not have hemophilia or rickets but lacked a tail.
Compare and contrast the mechanisms of transcription initiation in prokaryotes and eukaryotes. Suppose you were to count one coliform colony produced from a 10 ml water sample.
The key functions of digestive system are the ingestion of food, ______ of food through the digestive system, ______ by ______ and ______ digestion, ______ and ______.
The phosphorylation and dephosphorylation of proteins is a vital means of regulation. Protein kinases attach phosphoryl groups, whereas phosphatases remove phosphoryl group from the target protein. What is the energy charge of this kind of covalen..
Determine which biological macromolecule is not really a polymer and Which statement about biological polymers and their precursors below is TRUE?
Diagram the cycle of carbon during photosynthesis, carbohydrate production and breakdown, fermentation and combustion.
A 55-year old woman presents with symmetric stiffness and swelling of the proximal interphalangeal joints of the hands and of the metacarpopharyngeal joints, as well as fatigue, malaise, and myalgia. Symptoms are worse in the morning or after exte..
An isolated piece of skeletal muscle tissue is genetically engineered so that gap junctions are expressed in muscle fibers. Create a plot of the length-tension relationship for this modified muscle tissue.
It also makes an antidote molecule called brevenal that binds to sodium channels and protects them against the toxin. Brevenal may end up being a treatment for CF; in a sheep CF model, brevenal blocked bronchoconstriction and enhanced the clearance o..
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