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Q1. At the same time that you did the viable cell count of your bacterial culture (in problem 10), you also counted the cells in a Petroff-Hausser chamber; however, the cell count you obtained from Petroff-Hausser chamber is nearly double that obtained in the viable cell count. Based on this result, what may you conclude about the growth phase of the bacterial culture you are working with - was it likely to be in lag phase, exponential or stationary phase. Explain the answer.
Q2. In ward's Ap biology lab 7 (the drosophila lab) describe the parental cross you received; use genetic symbols. Depict a punnett square to show how the possible allelic combinations for this gene in the F1 generation.
Decscribe how antigen presenting cells process antigens and presentantigen fragments in association with MHC class I proteins.
The coefficient of static friction between his hands and the book is 0.335. To keep the book from falling, what is the magnitude of the minimum pressing force that each hand must exert?
determine the dominant and recessive expression of the gene?
In an adult mammal, which chamber of the heart pushes blood through the pulmonary circuit? Which chamber pushes blood through the rest of the body?
Compare and contrast signaling by neurons which secret neurotransmitters at synapses to signaling carried out by endocrine cells, that secretes hormones into the blood, define the relative advantage of the two mechanisms.
if a partticular DNA molecule consisted of 28% guanine-containing nucleotides, what percentages of nucleotides would contain adenine, cytosine, and thymine?
What organelles would you expect to find in exaggerated quantities in pancreaticacinar cells? What role does each of the organelles serve?
Why are bacteria, rather than say human cells, used as experimental organisms in molecular biology studies?
Suppose a woman who is both a homozygous tongue-roller and a non-PTC-taster marries a man who is a heterozygous tongue roller and is a PTC taster, and they have 12 children, how many of those 12 would you expect to be non-tasters, who are homozygo..
Which set of data represents a type of natural selection that stabilizes the allele frequencies of the population?
If it's sterile while in the bladder, what are different ways it can become contaminated? For example while obtaining a sample for a culture.
We are operating a centrifugal compressor. The gas composition does not change during this excursion. While holding suction pressure and flowrate constant, the inlet temperature rises.
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