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Evolutionary biologists have always used a broad range of modern organisms to infer the characteristics that ancestral organisms may have possessed. Genomic sequences are now available for an increasing number of species, and scientists studying evolutionary processes can take advantage of this enormous amount of data to bring evolution into the arena of molecular studies. By aligning the sequences of homologous genes and looking for regions of similarity and where changes have occurred, it is possible to infer the sequence of the ancestral gene.
What term is used to describe the changes in gene sequence that have occurred?
How can we use what we know about this process to construct a timeline showing when various sequence changes occurred and when they lead to the modern sequences that we know today?
which changes made the most severe effect on the protein
a bacterium will construct different proteins to metabolize the sugars lactose or glucose, depending on which one it detects in the outside environment. What part of the bacterium allows it to recognize different substances in the outside environm..
Review the major aspects of how the human immune system functions. How is the proper functioning of this system of major importance to all other systems in the body? What kinds of things can go wrong with the immune function and how do these probl..
In order for the 4-nitrophenol to release the yellow colour expected, it has to be fully ionised. With a pKa of 7, I have decided that pH9 will allow it to be fully ionised - this is also supported by yellow colour given off, and a reasonable calib..
Now that you've arrived at the lung, describe the structures you see and narrate how the body combats the invading bacterium using the knowledge you have grinded in the first 4 units. Address both specific and nonspecific immunity and the cells that ..
A male fruit fly with red eyes and long wings is mated to a female with brown eyes and short wings. The F1 offspring consist of red eyed and long-winged females, red-eyed, shortwinged males.
In cells, the phosphorylation of glucose is the first step in glucose metabolism and is accomplished by addition of phosphate from ATP which generates ADP and Pi (G° = -7.3 kcal/mole). Therefore, in the cell there are two reactions coupled togethe..
If a patient was treated with a total of 2 mg/kg of methylene blue, he weighs 140 lbs, how much methylene blue washe treated with.
Having studied the usefulness of restriction enzymes and the process of molecular cloning, propose a use for these two genetic technologies.
Analyze the data using the chi-squared fit test to determine if the frequencies of phenotypes are what would be expected from this cross.
What is the connection between an increase in light intensity and photosynthetic rate in leaves from a corn plant? How does this relationship compare with what you observed for tomato plants.
The chance that a baby will be a girl is 1/2 and the chance of having a boy is also 1/2. If a certain family has three boys, what is the chance that their next child will be a girl? Explain your answer.
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