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Starting with 10mL of original culture, you created three serial dilutions as follows. You removed 0.1 ml from the original culture diluted it into 0.9 ml of broth to make dilution "1". You removed 0.1 ml from dilution "1" and added it to 0.9 ml of broth to make dilution "2". You removed 0.1 ml from dilution "2" and added it to 0.9 ml of broth to make dilution "3". You then plated 10 microliters from the each dilution onto agar plates. The next day, you counted that 10 microliter of dilution "1" produced TNTC colonies, dilution "2" produced 31 colonies, and dilutions "3" and "4" produced no colonies at all. What was the total number of bacteria in the original culture?
Which of the following tasks CANNOT be performed by earthworms?
Explain the difference between positive and negative control over transcription. Why is it advantageous for the lac operon in E. coli to be under both positive and negative control? What would happen if only negative control occurred? What would h..
A mutation occurs in Gene A that prevents RNA transcription from terminating where it is supposed to. Explain what affect, if any, you believe this mutation will have on.
Write an essay describing how pancreatic hormones influence blood glucose concentrations over the short term (following a meal and fasted). Include a description with a diagram to demonstrate the role of negative feedback in the regulation of bloo..
For the tetraploid cross: AAAA x aaaa, what genotypes would be found in the offspring and in what proportions?
If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?
You find that there are two genes for dystrophin in rat and hypothesize that both are active in muscle because both contain the same enhancer-activating region.
What fraction of offspring of the cross AaBb × AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes?
how climate could have driven early human evolution.
(a) What does the Weismann's doctrine state? (b) Why is this doctrine so important for our understanding of evolution?
Lysozyme was assayed at bacterial cell wall, = 2.5x10-8 g. The Km for the substrate = 6x10-3g. At the end of one minute 2.5% of the cell wall hydrolysed.
Describe how the hypothalamus controls secretion from the pituitary gland. Be specific regarding circulation and communication between the two regions.
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