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Life as we know it could not exist without water. All the chemical reactions of life occur in aqueous solution. Water molecules are polar and are capable of forming hydrogen bonds with other polar or charged molecules. As a result, water has the following properties:A. H2O molecules are cohesive; they form hydrogen bonds with each other.B. H2O molecules are adhesive; they form hydrogen bonds with polar surfaces.C. Water is a liquid at normal physiological (or body) temperatures.D. Water has a high specific heat.E. Water has a high heat of vaporization.F. Water's greatest density occurs at 4°C.Explain how these properties of water are related to the phenomena described in parts a-h below. More than one property may be used to explain a given phenomenon.a. During the winter, air temperatures in the northern United States can remain below 0°C for months; however, the fish and other animals living in the lakes survive.b. Many substances, for example, salt (NaCl) and sucrose, dissolve quickly in water.c. When you pour water into a 50-ml graduated cylinder, a meniscus forms at the top of the water column.d. Sweating and the evaporation of sweat from the body surface help reduce a human's body temperature.e. Water drops that fall on a surface tend to form rounded drops or beads.f. If you touch the edge of a paper towel to a drop of colored water, the water will move up into (or be absorbed by) the towel.
DNA sequences differ between species due to substitution events, i.e. when new mutations arise and become fixed by drift or selection in one of the species.
Provide your opinion as to why the progress of gene therapy has been disappointingly slow. Give several specific examples of actual failures in gene therapy trials.
A particular variety of corn has a gene for kernel color and a gene for height with the phenotypes CC,Cc: purple kernel.
Maintained by balancing selection, such as heterozygote advantage and frequency-independent selection.
An analyzer is studying a gene that codes for a very small polypeptide phe his gly cys gly. He treated the cells with different mutagens with the results to the protein.
Nutrients from the food we eat must be absorbed into bloodstream so that they can be delivered to various parts of the body.
A forty-five year old woman goes to the primary care physician with abdmonal pain, nausea, and non - bloody diarrhea. A gram stain of a stool sample presents with gram negative rods.
In the case of a locus with two alleles, P is the frequency of AA, H is the frequency of Aa, and Q is the frequency of aa. As with gene frequencies, genotype frequencies must sum to 1.
If you have 100 mL of a 0.1 M tris buffer at pH 8.3 and you add 3.0 mL of 1 M HCl, what will be the new pH? The pKa of tris buffer is 8.3.
Some times in the movie, politics of science were discussed. Explain how politics played a role in the discovery of DNA structure. Do you think the science of today is more or less political than it was during the 1950s? Examine one instance of moder..
Utilize darwin's theory of evolution by natural selection to explain how a group of ancient mammals couple be the ancestors of a major new group of mammals, the cetaceans.
Today we can determine the genetic makeup of individuals and determine whether they carry traits that are potentially harmful such as huntington's disease knowing this.
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