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What are the advantages and disadvantages of the different types of light and electron microscopes that are used to study microorganisms? Focus your response in terms of the following parameters:
1) Range of magnification
2) Resolving ability
3) Sample preparation
4) Possible states of sample (e.g. whole organism, part of, living, non-living, etc.)
Why water is known as polar solvent? How is hydrogen bonding involved in cohesive attraction of water molecules? Water molecules also attract other sorts of molecules, particulary ions.Why is this.
Assume you were given fifty ml of sewage and asked to determine the number of bacteria in the sample. You began by taking five ml and putting it into 45 ml of sterile water.
A and B are linked. Analysis of a linked RFLP in two purebreeding lines, AABB and aabb, demonstrate that the first was also homozygous for a long RFLP allele.
Non-peptide transmitters still contain a specific mRNA sequence that can be recognized by in situ hybridization assays. Under such a situations, it is assumed that the non-peptide transmitter has been translated.
If C-1 of glucose is radioactively labeled & then enters glycolysis, which carbon of G-3-P will be labeled? Determine what fraction of the molecules will carry radioactive label?
Other than bacteria, what other kinds of microorganisms might you see in the negative smear of the mouth?
In explaining their findings, the authors have ignored a major threat to the validity of their estimates of exposure. Explain and discuss this error.
what would be the f2 phenotypes and frequencies?
Which halogen is used in gaseous and liquid form for large scale disinfection of drinking water and sewage.
A salad contains lettuce,eggs,bread crumbs, and olive oil. Describe two macromolecules contained in this salad?
Explain why it is important not to touch any other area of the mouth except the pharyngeal membranes when taking a throat culture.
Why are heavy metals such as lead, uranium, platinum and gold particles used in electron microscopy and why can't fluorochromes be used instead?
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