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Natural selection is such a powerful force in evolution because cells with even a small growth advantage quickly outgrow their competitors. To illustrate this process, consider a bacterial culture that contains 106 (1,000,000) cells that double every 64 min. One cell acquires a mutation that enable it and its progeny to divide with a generation time of only 30 min. Assuming there is nothing to limit the growth of the culture (e.g. unlimited food supply) and no cell death, how long should it take for the mutant cells to overtake the culture? Give your rounded answers in minutes (min). The number of cells N in the culture at time t is given by N=N02t/G where N0 is the number of cells at time zero and G is the generation
In 1954, Public Health Service organized an experiment in that nearly 2 million children in grades 1, 2 and 3 participated. Experiment was to test a vaccine. Name the disease c
Define Carbohydrate requirement to avoid underweight problem? Liberal amounts of easy to digest carbohydrates should be included in the diet. The intake of dietary fibre should
What is ventilation A. An increase in the hydrogen ion concentration in the interstitial spaces of the brain stem leads to an increase in the duration of the respiratory cy
Tumor Suppressor Genes Tumor suppressor genes or anti-oncogenes generally inhibit cell division in cooperation with proto-oncogenes. The very existence of these genes prevent
Q. What are the major biological functions in which chlorine ions participate? Like sodium cations, chlorine anions actively participate in the regulation of the osmolarity of
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CELL COAT (GLYCOCALYX) Present in Protists and animal cells. Usually made of oligosaccharide side chains of glycolipids and glycoproteins. Cell coat has very charged t
Define Synthesis of Hormones - Vitamin C? Ascorbate is involved in the amidation, thereby conferring stability to hormones such as thyrotropin releasing hormone, adrenocorticot
Explain Enzymatic Proteins The most varied and most highly specialized proteins are those with catalytic activity - the enzymes. Virtually all the chemical reactions of organic
Explain Inhibition of cancer cell proliferation and growth? Vitamin D diminishes proliferation of abnormal intestinal, lymphatic, mammary and skeletal cells and provides a pote
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