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Suppose you are a director of a ballet theater. After reading a book about the cell cycle, you are intrigued by the similarity between your night show and the cell cycle. Each night the theater fills, the lights go out, the curtain rises, the dancers perform, the curtain falls, the lights go on, and the spectators leave, just like the cell cycle consisting of a defined sequence of events. So you decided to improve theater operation by incorporating checkpoint mechanisms similar to the cell cycle control system. First, you designed a system that raises the curtains automatically when all the seats are filled. In each seat, sensors were installed to detect a seated person. But you have not decided how to connect the sensors to the curtains.
a) You can set the sensors to send out a positive signal that adds up to be enough to raise the curtain or set each sensor to send out a negative signal that will stop the curtain from going up until every seat is filled. Which system do you think a cell would use for cell cycle control?
b) Compare advantages and disadvantages of the two modes and explain your answer. (Your shows are so popular that all the seats are filled in each show. You don't have to worry about a block in the system due to empty seats.)
Would two nucleotides at a time be sufficient to provide enough codons to code for all twenty amino acids? Discuss how many amino acids could be coded for by codons containing only two nucleotides?
Compute the volume of a red blood cell, assuming the blood cell is disk shaped with a diameter of ten um and a thickness of 3 um.
If narrow-sense heritability in the rabbit population is 0.7, what is an expected body weight among offspring of selected rabbits. What was the amount of cash paid on accounts payable for the period of the year ended December 31.
Explain how sexual reproduction in plants illustrates alternation of generations. Include the processes involved and include at least one type of plant to illustrate your answer.
Claussen and colleagues proposed two hypotheses to describe this variation within a species. There are genetic differences between populations of plants found at different elevations.
Proportion of Australians aged twenty-five years and over with high blood pressure, by age group, 1999-2000. Note: High blood pressure is defined as systolic blood pressure of 140 mmHg or more;
Choose a neuro-endocrine program in which you can show the importance of structure/function relationship, organization levels, and feedback control.
Define stable equilibrium in population genetics. Describe the kind of data that you would need to collect about a population to conclude that it is in a stable equilibrium.
An amateur horse breeder has acquired four new bay-coloured mares (female horses) with uncertain pedigree. What are the probable genotypes of the mares purchased.
Several of the cells hydrolytic enzymes are located in the lysozyme where the ph is five. What would you expect to be the optimum pH for these enzymes,
Suppose that the cells grow to about 10^5 cells per squre cm and contain about 10pg RNA per cell, determine the theoretical yield of RNA from one of your samples.
What does information suggest about the transmission.
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