Why are muscle and nervous tissue not replaced by the body if damaged or lost?
What will be an ideal response?
Human adults have few stem cells that are capable of becoming muscle or nervous tissue.
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When members of the normal microbiota of the human body become pathogenic and produce disease under certain circumstances, they are referred to as ________ pathogens.
A. conditional B. occasional C. opportunistic D. partial
A drug researcher has developed a macromolecule that can bind to scrapie and thus change the prions conformation. What effect might this have on the actions of scrapie?
A. The shape change could prevent the scrapie protein from converting normal proteins to scrapie proteins B. The shape change could induce scrapie protease activity C. The shape change could stop the transcription of scrapie RNA D. The shape change could stop the replication of scrapie DNA E. The shape change could block the translation of scrapie RNA
The majority of defects in human genes are
a. large deletions. b. missense or nonsense mutations. c. large rearrangements. d. mutations affecting splicing. e. small deletions.
The process of making DNA from an RNA template is referred to as ________
A) reverse transcription B) transcription C) translation D) transversion E) recombination