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In the presence of high intracellular concentrations of tryptophan, only short transcripts of the trp operon are synthesized because of attenuation of transcription 5' to the structural genes. This is mediated by the recognition of two Trp codons in the leader sequence. Explain what effect mutating these two codons to UAG stop codons would have on the regulation of the operon in the presence or absence of tryptophan.
Create a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water.
Drugs known as nucleoside analogs (NA) act against RT, whereas drugs called protease inhibitors (PI) act against PR.
A dominant allele, A, causes yellow color in rats. The dominant allele of another independent gene, R, produces black coat color.
Suppose that the length of ten base pairs of DNA found in one turn of the helix is 34 A, what is the average length of a human chromosome in centimeters?
Chooses the statement that best describes a buffer. A buffer prevents pH of a solution from changing while an acid or base is added.
When a yellow female Labrador retriever was mated with a brown male, half of puppies were brown and half were yellow. The same female, when mated to a brown male produced all brown puppies.
Consider the following reaction sequence S + E (ES)1 (ES)2 --> P + E The first reversible reaction has forward and reverse rate constants of k1 and k2; the second reversible reaction has forward and reverse rate constants of k3 and k4; the thi..
The given tetrads were manufactured by a cross of a Neurospora strain that had white spores and a nutritional requirement for the amino acid.
In mid afternoon, they are on it's under surface, each caterpillar hanging by a few legs. Offer a hypothesis to explain this behaviour. How would you test it.
You have 0.05 mL of an undiluted culture at a concentration of 3.6 x 106 CFU/ml. You then add 4.95 mL sterile diluent. what is the dilution, and what is the final concentration of the cells?
Assume that one hundred wolves of the same species reside on an isolated island develop a disease due to inbreeding. Scientists who ventured to the island have found.
Think about an enveloped virus fusing with the plasma membrane. If fusion can not be triggered by low pH because the plasma membrane is neutral,
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