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1. Describe how the concentration of tryptophan influences the transcription of the E. coli trp operon.
Compare this regulation with the lac operon.
2. For the E. coli lac operon, write the partial diploid genotype for a strain that will produce β-galactosidase constitutively (and shows no elevation of levels with induction) and permease by induction.
Explain the process of viral replication; discuss both normal and retroviruses, and comment on the implications of this process for genetic engineering.
Robert, a smoker, is 52 years old. He has elevated blood pressure, in part, due to an elevated erythrocyte count. Knowing that smokers often have reduced plasma O2 levels, explain in detail (in a paragraph) why his erythrocyte count is elevated.
IN humans, normal pigmentation is due to a dominant gene A. Albinism is due to the recessive allele a. A man without albinism marries an albino woman and their fist child is an albino. What are the genotypes of these 3 people?
Which bones articulate with the femur?
Very stable proteins can still degrade after adsorption on the surface as time increases. How would you examine this? What would you do to minimize degradation of a protein.
With your understanding of how telomeres protect chromosomes (as you explained above), how might they provide a mechanism for cellular aging.
what kinds of matings would produce only palominos
What is the purpose of the long refractory period during cardiac muscle contraction (compared to that of skeletal muscle)? What could happen if cardiac muscle did not have this long refractory period? Explain.
How ere the bacteria getting into the household water? What bacterial structures make this possible?
What does it mean to say that an allele is "fixed"? a. Its base sequence is set--no mutation is possible. b. Its frequency is 1.0. c. It is recessive. d. It is dominant.
In a chemical reaction the free energy change (/\Go') is -40 jk/mol and the entropy factor T/\S is 15 kj/mol. the enthalpy change /\H for the reaction is
Why do most multicellular organisms require transport systems.
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