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The four phases of the disposition of a toxic compound to assess its toxicity are absorption through membranes in a system, the distribution throughout the system, the excretion and elimination from the system and lastly, the metabolic fate of the chemical. Using these four phases assess the toxicity on DDT. I would also like to know how DDT is transported through the cell membranes. Is it passive diffusion, facilitated diffusion, filtration, active transport, etc. I know it is lipid soluble.
A 40 year old woman was admitted into ER with fever, chills, and a dry cough with little sputum. Epidemiologists isolated pathogen in the cooling system of the air conditioning unit.
The altered tRNA translates the UGA as tryptophan. What nucleotide varies has probably occurred in the mutant tRNA molecule? What consequences will the presence of such a mutant tRNA have for the translation of the normal genes in this cell.
In a population of 1000 individuals, 510 show the dominant phenotype. How many individuals would you expect of each of the possible three genotypes for this trait.
The Kingdom Fungi contains members with saprobic, parasitic and mutualistic modes of nutritiom. How do these types of nutrition relate to the ecological and economiv importace of this group.
Represent graphically the relation between melting temperature and the G-C content of DNA. Construct relations for dependence of melting temperature of a 30 bp DNA duplex on the G-C content.
The bacteria are allowed to grow overnight and are streaked on a plate using a technique that produces isolated colonies that are clones of the original. Samples of these colonies are then grown in four different media: nutrient broth plus ampicillin..
Another temperate biome planned for the biome garden is the temperate grassland/desert biome. Your friend is particularly interested in developing temperate grassland. Discuss some of the considerations involved in establishing such grassland under g..
How is variability, diploid, independent assortment, crossing over, out breeding mechanisms, polymorphism, heterozygote superiority, hybrid vigor, clines and ecotypes, protogenes, and gene amplification and Pleiotropy relate.
If a maize plant is heterozygous for the alleles for pigmy and crinkly-leaf (both recessive to normal size of plant (S) and normal leaf (L) is self pollinated and 208 seeds are subsequently collected and germinated, how various would you expect to sh..
A middle-aged man comes in since he has noticed multiple small, blood-red, raised lesions over his anterior chest and abdomen for past numerous months. They are not painful and he has not known about any bleeding or bruising. He is concerned this mig..
What series could you use to make a beta barrel with twelve antiparallel strands? Write out one repeat of the sequence as follows: M-(your sequence) 12.
Suppose that P is always completely dominant to any number of p's, and that the locus is close to the centromere. What is an expected ratio of purple:white in the progeny of the next crosses.
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