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Question 1: Embryonic chickens are a favorite organism in developmental biology research because they are very similar to mammalian embryos. Chick embryo somites form along the neural tube a couple of days after putting a fertilized egg into a warm incubator or being cared for by a hen. The somites are visible for 4 or 5 more days before their cells disperse to produce various kinds of tissues like skeletal muscle, bone, or connective tissue. If cells are taken from a somite soon after it is formed and transplanted into a different region of another somite, the transplanted cells form whatever tissue is 'supposed to be' formed by that somite region: cells taken from a muscle-forming region of one somite and put into a bone-forming region of another somite will form bone, not muscle. But, if one waits a couple of days after somite formation to take cells for transplantation, the older somite cells always form the kind of tissue specified by the region of somite from which the cells were taken: cells from a muscle region will still make muscle tissue even when transplanted into a bone-forming region. What could have happened to the later-transplanted cells that kept them from forming bone and ensured they formed only muscle?
Question 2: An 8-cell frog embryo can be separated into its individual cells and those cells placed in incubators with all the necessities for development. Each cell can divide and produce more cells but none of the cells can produce anything resembling a normal tadpole. Mouse 8-cell embryos can be separated into individual cells and those cells individually re-implanted into a female uterus. Each of the cells can produce a complete, normal embryo and ultimately a normal mouse. Why can mammals be cloned this way while amphibians cannot?
Explain specifically how irradiation using the following methods destroys microbes provides an examples(s) of materials that can be sterilized by each of the techniques below.
What effect would it have over the results of study? Draw up a two-by-two table displaying the misclassification, then determines estimates of the risk ratio for both true and the misclassified results.
Case study on Salmonella Outbreaks in the U.S.
Explain how you would build a Windkessel machine, including individual parts and assembly. How would you operate this machine? What cardiovascular physiology principle would machine display and how would you measure this phenomenon.
Discuss the properties of the wild type amino acid? Properties include charge, shape, size and flexibility, features unique to the amino acid.
If a 100X solution is 1 M, what is the concentration of a 1X solution? Explain how you would prepare 100 mL of a 0.5 percent w/v agarose in 1X TAE buffer starting with a 20X TAE stock solution and solid agarose powder.
Critically discuss three of the test systems used to study the effects of a toxicant on chromosomes, describe each test system, and discuss one advantage or disadvantage of that particular test system.
create a specific experiment to measure the rate of cellular respiration in an organism of your choice
Complete the following table titled 'Applications of Different Observational Study Designs' indicating for every objective under the pertinent study design if objective is 'suitable' or 'not suitable'.
why DNA was discarded as a possible candiate
Explain the sites and actions of the cardioinhibitory and cardioacceleratory centers and also discuss the factors that affect heart rate and stroke volume.
Hermione is NEITHER affected by NOR a carrier of alkaptonuria an autosomal recessive metabolic disorder. She is, however, a carrier for hemophilia.
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