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In order for the Gram stain to work properly the ethanol in the decolorizer must be at a concentration greater than 60%. Imagine that you are working in the microbiology laboratory. You are instructed to make more Gram stain reagents. You mistakenly prepare a 50% ethanol solution. How will this affect the results of your Gram stains? Explain. You realize your mistake and prepare the decolorizer using the proper concentration of ethanol. The post-doc in the lab tells you about the Mycoplasma bacteria. These are bacteria that are taxonomically related to the Gram positive bacteria but do not have a cell wall. You are curious and decide to conduct a Gram stain on the Mycoplasma that you have in the lab. What result will you observe? Explain why.
What are the roles of the cell surface, the cytoskeleton and intercellular signaling in development? Include examples from gastrulation, induction, morphogenesis and axis formation.
Assume you have 2 tubes containing cultures of genetically distinct bacterial strains. You know that when you mix the two together, you get Horizontal gene transfer.
Would the blood pressure in the pulmonary capillaries at the bottom of a lung be the same as the blood pressure in the capillaries at the top of a lung in the standing individual? Which area would have the lower blood pressure?
A mouse breeder has a strain of black mice that normally breed true and produce only black mice. Occasionally, however, a brown mouse or two has appeared in litters of some of the mice.
What is the function of the vitellus in the vertebrate egg? How are these eggs classified according to the amount of vitellus within them?
List two features that allow plants to withstand flooding of the root zone.
Size chromatography (S.E.C.) scanned 120,000 Daltons with urea. 80,000 and 60,000 with urea and beta-meta ->4 results. What is the protein structure?
Which of the follow is NOT a function of meiosis. Generation of genetic diversity by crossing over.
Antibiotics are chemical substances that kill or control the increase of bacteria or other organisms, such as single-celled protists, or fungi.
Describe how these two processes are related between plants and animal based on rectants and products (water, carbon dioxide, glucose and oxigen) of both pathways.
Describe what kind of changes need to occur in the motor neuron and its target muscle in order for a synapse to form. What kinds of proteins/organelles need to be summoned to the area in each cell?
Why is it important to first determine whether growth occurred in a different medium, such as starch agar before examining the plates?
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