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You serially dilute a stock of bacteriophage by sequentially taking: 10 ul into 1 ml, 10 ul into 1 ml, 100 ul into 0.9 ml and plating 0.1 ml on a sensitive strain of bacteria. You later count 65 plaques on that plate. How many phage per ml were in the original stock?
Describing how you would test the hypothesis. Start by examining the living species around you. Ever wonder why the pollinator is attracted to the particular flower.
What is signal transduction? and why are secondary messengers involved in signal transduction? For what added function do they serve?
What are the nucleotides at the intron boundaries of a DNA sequence that encodes the information of a protein with three exons?
A scientist has discovered a new cell. illustrate, in detail, ALL the ways the scientist could decide if the cell comes from a plant or an animal. How several of these result in the release of oxygen into the atmosphere?
Early in development, most human cells turn off expression of essential component of telomerase, enzyme responsible for addition of telomere repeat sequences (5' TTAGGG 3') to the ends of chromosomes.
What is the significance, while setting threshold for adverse effects, of the fact that, broadly speaking, solid particulates have much longer biological half times than gases and vapours.
Using principles of community ecology, propose a hypothesis to explain the results and outline her methods and science processes (as in dependent variable, independent variable, controls, constants) as used in the experiment. What extra evidence woul..
determine the genotypes of the two parents: A) a walnut crossed with a single produces offspring that are ¼ walnut, ¼ rose, ¼ pea, and ¼ single.
Two new chemicals have just been made by one of our colleagues in the medicinal chemistry area. The discoverer thinks that these chemicals will improve memory, so we test these drugs called A and B.
What experiment could be performed to ascertain if an antimicrobial agent is bactericidal or bacteriostatic? Can a bacteriostatic agent become bactericidal in the long run or vice versa? Why?
A Drosophila P element 2.2 kb in length is modified by adding a 0.8-kb intron sequence to one of its exons. A copia element of 5.2 kb is modified through adding the same 0.8-kb intron to its central region.
A batch animal cell culture has a productivity of 1.8 g/L*day, with a MUmax=0.5 days, a 10% inoculums and a turnaround time of 5 hours. If a continuous culture could operate at a dilution rate of 90% MUmax, explain what would be the productivity.
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