PCR has revolutionized the criminal justice system through DNA fingerprinting
For a given fragment of DNA, showing that a suspect's fingerprint differs from that found at a crime scene immediately excludes him or her from suspicion, yet finding a match does not mean that guilt can be automatically concluded. Why?
Different fragment lengths clearly must have come from different sources, but having the same fragment length only means there is a match–it may be possible for multiple persons in the population to possess the same fragment length.
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Bacterial isolates from post-surgical infections of several patients on the same hospital floor demonstrate an increase in resistance to similar antibiotics. The pattern of antibiotic resistance in these cases is most likely due to vertical gene transfer among bacteria that carry resistance genes to bacteria that lack those genes.
Answer the following statement true (T) or false (F)
Oxygen is required for ____________ to take place.
A. the electron transfer system B. light-dependent reactions C. light-independent reactions D. glycolysis
The property on which the acid-fast stain depends is:
a) affinity for basic dyes b) capability for reducing silver c) failure to stain with a dye other than basic fuchsin d) ability to resist decolorization with dilute acids
Epstein-Barr virus infections are typically asymptomatic in ________ because of incomplete development of adaptive immunity
A) the elderly B) AIDS patients C) adolescents D) adults E) young children