Briefly describe how the experiments performed by Frederick Griffith provided evidence of DNA as the genetic material

What will be an ideal response?


Griffith used two strains of the bacteria Streptococcus pneumoniae. One strain caused
disease, known as the S strain, and the other strain was a harmless strain called the R strain.
When the S strain was injected into mice, the mice died; when the R strain was injected into
mice, the mice lived. When Griffith heat-killed the S strain and injected it into mice, the mice
then lived. However, when he injected heat-killed S and R strains together in mice, the mice
died. Griffith showed that the S strain had transformed the R strain, causing it to become virulent
and kill the mice.

Biology & Microbiology

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A structure that thickens the uterine

endometrial lining in preparation for pregnancy is indicated by a. A. b. B. c. C. d. D. e. E.

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Rheumatoid arthritis is the most threatening form of arthritis and often results in a replacement prosthesis of the damaged joint. Explain how this form of arthritis differs from other forms

What will be an ideal response?

Biology & Microbiology

The French taxonomist who, in 1809 was the first scientist to suggest that organisms that use one part of their body repeatedly would increase their abilities was

A. Charles Darwin B. Alfred Russel Wallace C. Jean lamarck D. Georges Buffon. E. Charles Lyell.

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Fleas, lice, and tapeworms are parasites. Parasites are organisms that live on or inside a host organism and

a) harm the host b) genetically mutate the host c) help the host d) have no effect on the host

Biology & Microbiology