Cdks are activated only when they bind to
A) centrioles. B) cytosine. C) cyclin. D) chromatids.
C
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You're a famous eye surgeon, specializing in corneal transplants. Give your choice, would you rather have a cornea for transplantation from a 20 year old individual, or a 60 year old individual (assuming there are no optical defects due to age), and why?
A. The 60 year old-clearly, if the individual has gone 60 years with no optical defects, this is a very good organ for transplantation. The 20 year old cornea may have defects that simply haven't become apparent yet. B. The 20 year old cornea-younger is always better when dealing with tissue transplants. You want to give the transplant the longest possible time for survival in the recipient. C. The 20 year old cornea-while extremely rare, it may be possible to transmit prions through corneal transplants. It's less likely that a 20 year old would have encountered and become contaminated by prions than the 60 year old. D. The 20 year old cornea-never mind prions, there are a variety of agents that can hide in corneal tissues and that might cause disease. It's far more likely that the 60 year old would be harboring one or more of these pathogens than the 20 year old.
All of the following characterize nitrogen narcosis
EXCEPT a. muscle cramps. b. neural signal disruption. c. euphoria. d. drowsiness. e. weakness.
The programmed death and destruction of a cell is called ___________.
Fill in the blank(s) with the appropriate word(s).
The cellular structure indicated by the arrow in the accompanying figure is responsible for:a
replication. b. protein synthesis. c. cellular respiration. d. digestion of unused organelles. e. lipid and fatty acid metabolism.