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A Bio 5A student has the choice of three types of pigment to study for an exercise in quantitative spectrophotometry. She always liked the bright yellow color of ripe bananas, so the pigment responsible for this color was chosen. A solution comprised of 100 ml acetone and 100 ml H2O was used to extract and purify the yellow pigment. The pigment solution was then evaporated to a dry powder, dissolved in methanol, and given to the student in this condition. What would be the appropriate blank to use for the spectrophotometric measurements? A. A mixture of equal volumes of acetone and H2O. B. Acetone C. H2O D. Methanol E. More information is needed before this determination can be made.
Josie has been taking steroids for a prolonged period of time as treatment for rheumatoid arthritis. She has gained weight, especially in her face, and notices that her skin is thin and bleeds easily.
Explain why only certain cell types are permissive for transcription of HIV proviral DNA. What cellular factors are involved and why?
Arsenic is a compound naturally occurring in very low concentrations. Arsenic blood concentrations in healthy individuals are Normally distributed with mean =3.2 ug/dl and standard deviation = 1.5 ug/dl.
What type of electrode would they need to use (express material and design)? Provide a simplified schematic (circuit model of the electrode) described in the notes. Also discuss at least two benefits of an exoskeleton as well as how arthropod grows ..
Within an essay response, discuss the next concepts: an antioxidant's function, free radicals and their effect on the human body, sources of vitamin C, optimal delivery system for vitamin C, and precautions for use of vitamin C.
Advantages and disadvantages of mesoderm, the need of modifications for the elimination of nitrogenous waste, and a description of protonephridial function.
Two consecutive crosses, with the first between pure-breeding parents that differ in two phenotypes to create an F1 generation, and the second in two F1 progeny to create an F2 generation.
Chimpanzees have 24-pairs of chromosomes. Chimpanzee somatic cells contain DNA double helices.
Examine of the bases of a sample of nucleic acid yielded these percentages: A= 20%, G= 30%, C= 20%, T= 30 percent. Explain why is the sample single stranded DNA.
The restriction enzyme Scs1 cuts at a restriction site that is found only very rarely in dog genomes. One dog, Jimmy, has two restriction sites for this restriction enzyme in his genome. Another dog, Billy, has three restriction sites for this enz..
At a situation, the investigators found a bullet lodged into the window frame above the woman’s desk.What kinds of equipment are forensic scientists most likely to use when analyzing the bullet?
Illustrate the process of diffusion. Name and explain the condition that exists when the diffusion of a particular substance is complete.
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