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Microbiology
1. For what specific purpose was gram staining developed for? what is it used for today?
2. Why is the presence of air bubbles a sign of contamination?
3. Why is a gram stain helpful when monitoring bacterial contamination in food or investigating a foodborne illness outbreak?
4. Do you think bacteria always have to be gram stained in order to view them? why or why not?
q1. transformation of competent bacteria selecting for eg ampicillin-resistance 4. r select tet amps tets-e. b. gene
Inheritance and Genetic Engineering-In 1918, an influenza pandemic that originated with avian flu killed 50 million people. Researchers isolated samples of that virus from bodies of infected people preserved in Alaskan permafrost since 1918
A bacterial cell is missing the sigma factor that helps to regulate the araoperon. Will the ara operon be transcribed when arabinose is present? Explain why.
A somatic cell of a given plant species contains threebillion base pairs of nuclear DNA and 12 functional centromeres when observed at the conclusion of stage G2 of the cell cycle.
What are the negative affects of habitat fragmentation?
The autosomal recessive gene transformer (tra) mutation converts chromosomal females into sterile males. A female Drosophila that is heterozygous for the tra allele is mated with a normal male homozygous for transformer. What is the sex ratios of the..
Describe the "optimal" conditions for photosynthsis. What climate conditions favor plant growth ?
Give an example of how a specific virus control the release of its genome so it only occurs at precisely the right point (max 4-5 sentences).
carbon dioxide is important in our atomosphere because it is required for photosynthesis and traps some heat keeping
In a population of chicken, three color morphs defined by two alleles occur: dark brown with genotype BB, light brown with genotype Bb, and white with genotype bb.
You are attempting to modify an existing antimicrobial drug to treat intestinal bacterial infections. The drug has numerous unwanted side effects when it reaches the bloodstream, so you want to enhance the availability of the drug in the GI tract, bu..
describe the basic properties of DNA that are responsible for fiber formation when alcohol is added to solution that contains DNA?
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