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Q1. Bacteria are grown in 15N (heavy) medium and next transferred to 14N (light) medium and allowed to replicate for 1 generation. The DNA is consequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
Q2. The Mad Scientist's Death-Ray
Imagine that a mad scientist invents a death-ray that destroys a person's ciliary, sphenopalatine, and submandibular ganglia (and nothing else). Examine all the symptoms the victim would show. Will victim die, or would the scientist have to go back to the laboratory to invent a more effective death-ray?
A plant that has seed very rich in an oil that can be directly used as a biofuel to power vehicles has been discovered. the plant is able to grow on a marginal farm land and thus fuel oil production would not compete with food production.
An attempt to transfer bacteria to new media during the death phase of a culture resulted in actual growth of the organisms. What is the most likely explanation for this phenomenon?
Briefly describe the development of the human embryo from the formation of the zygote to the point where the three embryonic germ layers develop. List the types of adult tissues that are derived from each of these germ layers.
What is the basic theory of biological evolution and what evidence is there to support this theory? Describe the two scientific models for evolution.
What are advantages and disadvantages or observing living-specimens slides and heat-fixed-specimen slides of microorganisms. Which statements correctly describe the population of wolves.
What mode of nutrition these bacteria almost certainly use. Include in the discussion the RDA guidelines recommending less than 30 percent of total calories come from fat.
Suppose that a cell's demand for ATP suddenly exceeds its supply of ATP from cellular respiration. Which statement correctly describes how this increased demand would lead to an increased rate of ATP production?
What are at least two reasons why identifying an organism using DNA sequence data is better than using the metabolic characteristics (e.g. ability to ferment lactose)? What about the opposite-what are at least two reasons that metabolic testing wo..
Plants are able to photosynthesize or make and store energy from light energy.
With these anatomical features in mind, do some research in order to determine an angiosperm which has modified leaves, stems, roots or flowers that do not function in the normal manner, or that function in an unusual manner.
In certain organisms, exposure to a toxin leads to resistance as a result of mutation of the toxin receptor. At the same time, reproductive ability is lost. Explain how a change in the expression of a gene for a toxin receptor could also affect ex..
Mimulus lewisii and Mimulus cardinalis are two plants that occupy the same habitat but do not interbreed in nature. Though, they can be readily crossed in the laboratory to produce fertile offspring. Which is a likely reason that prevents interbreedi..
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