Which of the following damaged templates encountered by a replication fork is repaired by double-strand break repair?
A. The replication fork encounters a lesion and translesion synthesis occurs.
B. The replication fork encounters a lesion and stalls.
C. The replication fork encounters a lesion and bypasses it, restarting synthesis on the other side of the lesion.
D. The replication fork encounters a lesion at which repair has been initiated and the fork collapses.
E. The replication fork encounters heteroduplex DNA.
D
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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.
A person can live a normal life without which digestive system organ?
A) liver B) gall bladder C) pancreas D) small intestine
Plasma membrane glycolipids are found
a. exclusively in the inner leaflet. b. exclusively in the outer leaflet. c. equally distributed between the inner and outer leaflets. d. only on the basal surface of epithelia.
Darwin originally defined evolution as __________.
Fill in the blank(s) with the appropriate word(s).