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Suppose that a duplex DNA molecule undergoes two double-stranded breaks that tightly flank the promoter of a gene and that the promoter region is inverted prior to enzymatic repair of the breaks. Would you expect the inverted promoter to be able to recruit the transcription complex? What, if anything, would be wrong with the transcript of the gene?
The molecular with of e. coli dna is 2.5 x 10^9. The average molecular weight of a nucleotide pair is 660 and each pair contributes 0.34nm to the length of the DNA molecule. What's the length of the dna molecule?
Explain why limp celery becomes crisp and the skin of your fingertips wrinkles when placed in tap water. (The principle is exactly the same.)
What ethical issues might arise when a drug company funds trials of a new drug it has developed to treat a genetic disorder?
If the forward mutation rate is 1 x 10-5 new mutations per gene per generation, what is the average number of new mutations per gamete per generation? Show your work.
Although several different mammalian species have been cloned, the efficiency of this process is extremely low. Often tens or even hundreds of oocytes must be implanted with donor nuclei to obtain one healthy live birth.
When breeders make selections they do so based on the phenotypes of plants they are comparing. Write a half page discussing the different sources of environmental variation that can influence the phenotype a breeder will observe
Discuss the advantages and disadvantages of using transgenic bacteria, yeast and plants in biofuel production.
In humans, red-gren color blindness is recessive and X-linked, while albinism is recessive and autosomal. What types of children can be manufactured as the result of marriages between two homozygous parents.
Contrast the somatic and autonomic divisions of the efferent nervous system. Mention at least three characteristics of each.
A eukaryotic cell has organelles that compartmentalize cellular functions. (Incidentally, bacteria do not have organelles.) What is the primary compartment which distinguishes between the two main types of cells? What is the advantage of separatin..
Compare the sympathetic and parasympathetic systems in terms of the location of their ganglia, distribution of nerves, neurotransmitters, and receptors.
An elderly man, Tom, complained to his doctor about intense pain in the joint area of his big toe. The pain would last several days, subside, and then recur weeks later.
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