Summarize Fredrick Griffith's, Oswald Avery's, and others' experimental search for a treatment for pneumonia
What will be an ideal response?
Griffith discovered that the ability to cause pneumonia is a genetic trait that can be passed from one strain of bacteria to another. Griffith isolated two strains of Streptococcus pneumoniae. One strain was surrounded by a capsule that allowed it to evade the immune system and cause pneumonia. Griffith called this strain S. The other strain was not surrounded by a capsule and did not cause pneumonia. Griffith called this strain R. He found that mice injected with strain R do not develop pneumonia and mice injected with strain S develop pneumonia and die. Furthermore, when the S strain cells are killed by heat treatment before injection, mice do not develop pneumonia. Griffith discovered that when mice are injected with a mixture of heat-killed S cells and live R cells, they develop pneumonia and die. Avery concluded that DNA from the dead S cells was responsible for transforming the R cells into S cells.
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Nature is __________ in the universe except what
humans have__________. a. living; destroyed b. everything; manufactured c. macromolecular; genetically engineered d. verifiable life-forms; selectively bred e. matter; artificially created
There are ____________________ autosomes present in a human sperm cell. Fill in the blank(s) with the appropriate word(s)
What does bright red blood indicate?
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The ________ algae are an important source of carrageenan, which is used to thicken paints, cosmetics, and ice cream
Fill in the blank(s) with correct word