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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.)
Which of these situations would be most positive to the re-establishment of resident zoochlorellae, assume compatible Chlorella are present in P. bursaria's habitat.
How do cadherins, IgSF members, and selectins differ at the molecular level in the way they mediate cell-cell adhesion?
Assume you infected an E. coli culture with a virulent bacteriophage. Most of the cells lysed, but a few survived - 1x10^-4. You wonder where the resistant bacteria came from.
Certain unscrupulous operators offer, for a fee, to freeze recently deceased individuals in liquid nitrogen until medical science can cure the disease from which they died. What is the biochemical fallacy of this process.
find out the major pathway of glycine degradation. you find that the amino acid serine contains the most radioactivity, and that both the Calpha and Cbeta carbons of the serine residue are labeled with 13C. Explain these observations.
Discuss the difference between DNA methylation and histone methylation? I understand that both include the repression of genes and that DNA methylation occurs at CpG islands.
Would you expect the salivary gland cells to possess the monoploid or diploid number of chromosomes for the D. virilis species.
A substitution mutation occurs in the GRE making it unrecongnizable to the glucocorticoid receptor. Determine what impact would this have on transcription of gene downstream of this element?
What techniques might be used to characterize the structure and composition of the structure. Which of the follow will the nurse include in her teaching plan for this patient.
A person has MG what would be the expected effect on calcium levels near contractile proteins, following the arrival of an electrical impulse at those neuromuscular junctions.
E. coli is being grown to a maximum cell density of 140 grams dry cell weight per liter in a bioreactor fitted with a flat blade turbines agitation system.
You have identified a strain of mutant E. coli that constitutively expresses from the lac operon. Considering that this is a mutation in a gene that encodes for a protein repressor.
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