Frederick griffith was one of the leading scientists looking at the genetic role of dna. he was working on two strains of streptococcus pneumoniae: the rough strain (r) did not cause pneumonia, but the smooth strain (s) did. when griffith heat-killed the s strain and gave both the heat-killed s strain and the r strain to mice, the mice developed pneumonia and died. what happened in this experiment that caused the mice to develop pneumonia? the r strain mutated and thus was able to cause pneumonia. there was more of the r strain added than previously. the immune systems of the mice were unable to cope with both the s and r strains simultaneously. even though the s strain had been heat-killed, it changed the r strain.
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Biology, 21.06.2019 16:30, lucylubugg
Which of these is not a function of some membrane proteins ? a. allowing polar molecules to enter the cell b. recognizing other types of cells c. receiving messeges from other cells b. carrying messages to oher cells
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Biology, 22.06.2019 06:00, nefertiri64
How can you tell the difference between rough er from smooth er?
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Frederick griffith was one of the leading scientists looking at the genetic role of dna. he was work...
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