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An epidemiological study of prostate cancer among elderly men followed 1,400 men, 65-79 years of age, without evidence of prostate cancer over several years. Every two years the investigators examined the men for prostate cancer. The results were as follows: 12 new cases at the first evaluation, 11 new cases at the second evaluation, 23 new cases at the third evaluation, and 28 new cases at the fourth (final) evaluation. The investigators also noted that 35 of the men had withdrawn from the study at the third evaluation. Based on this information, calculate and interpret the incidence density rate of prostate cancer in this group.
What are plasmids? What is the importance of plasmids for the recombinant DNA technology?
How would you attempt to produce plants that develop seedless fruits? How would those plants be propagated?
Explain why dihybird crosses of yeast always results in predicted phenotypic ratio but results of similar two crosses in eukaryotic organisms
Tetrodotoxin is a poison found in pufferfish and some other animals. most cases of human tetrodotoxin poisoning occur when a person eats cooked or uncooked pufferfish.
When a tropical moth is touched on the thorax it lifts its forewings up abruptly, exposing its brightly coloured hind-wings. What causes the moth to behave this way? What significance can we attach to the fact that the verbal ability scores of ado..
Rank the following from lowest to highest Rf on a silica gel plate.
If you cross a true-breeding dominant plant with a true-breeding recessive plant, what will be the phenotype of the resulting progeny?
What if you were using a plasmid that was 10 kb in size. You still want to use .05 pmoles of your target DNA. How many micrograms of DNA will you need for the transposition reaction?
what are the difference in shape and arrangement (only) between: diplococcus, staphylococcus, and stretococcus?
1. Hypothesize why some substances were not metabolized, while others were. Research the chemical formula of Equal and Splenda and explain how it would affect respiration.
Assume you identify a recessive mutation in the AP endonuclease in yeast. During the diploid phase of their lifecycle, the yeast are viable but haploid strains die rapidly.
Hydrogen peroxide is toxic to cells, yet is a common byproduct of the reactions that occur inside the body. How can this compound be changed to become non-toxic?
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