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1. CONCISELY AND CLEARLY describe the regulatory switch of the operon that manufactures tryptophan in E. coli.
2. CONCISELY AND CLEARLY describe the roles that RNA polymerases I, II & III play with respect to the major RNA types in eukaryotic cells?
3. Why are there 48 (humans) different tRNAs for 61 codons and only 20 aminoacyl-tRNA-synthases coupling these 48 (humans) tRNAs?
4. What are the recognition and "end replication" problems in eukaryotic and prokaryotic cells and its solutions in DNA (repair)?
5. In which type of mimicry is the model negatively affected by the mimic?
Assume you study a transmembrane protein that is trafficked through the endoplasmic reticulum but ultimately "lives" in the plasma membrane.
What are embryonic stem cells (ES)? How do embryonic stem Cells differ from Adult stem cells?
Draw a pedigree that represents an autosomal dominant trait, sex-limited to males and that excludes the possibility that the trait is Y linked.
Although physiologically distinct, chemolithotrophs and chemoorganotrophs share a number of features with respect to the production of ATP.
Male songbirds sing in spring because increasing daylength at this time stimulates testosterone production which spurs growth of song control circuits in the brains of male songbirds. Choose the best level of causation addressed by this explanatio..
Two genes are located on the same chromosome and are known to be 12 mu apart. An AABB individual was crossed to an aabb individual to produce AaBb offspring.
Normal unicorns have white coats but there are some with blue coats. normal unicorns have a single simple (unbranched) horn but there are some with a branched horn.
1 identify one specific molecular mechanism by which microbial organisms bacteria fungi viruses avoid a specific
Ebola is a far more contagious virus than HIV. However, there has never been a large scale ebola outbreak whereas over 40 million people in the world are currently living with AIDS. What are the characteristics of the ebola virus that hinder its a..
what is included in the genomic dna of prokaryotes and how do these elements differ from
For the following E. coli merodiploids lactose is present in the culture media. Use "YES" to indicate if lactose is utilized and "NO" if it is not. Explain why or why not for each.
a why did mammals including humans evolve to produce lactase as children but not adults?b why has the ability to
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