Avery and colleagues purified a white substance as the transforming principle. Treating this substance with enzymes that destroyed RNA, protein, or polysaccharides did not affect its ability to transform cells, but enzyme that degrades DNA destroyed the transforming ability. These results suggested that
A) their transforming principle was not entirely pure.
B) the transforming principle appeared to be DNA.
C) the test for transformation was not accurate.
D) a single gene could transform bacterial cells.
E) both DNA and proteins are required for transformation.
B) the transforming principle appeared to be DNA.
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Answer the following statement true (T) or false (F)
X inactivation can lead to ____________________ in females who are heterozygous for X-linked genes
Fill in the blank(s) with correct word
Which of the following statements best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?
a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are limited to the gastrointestinal tract. c. Habitats are mostly soil and water envi-ronment. d. Habitats are limited mostly to soil.
A cell that uses an organic carbon source and obtains energy from light would be called a
A) photoheterotroph. B) lithoautotroph. C) photoautotroph. D) chemoheterotroph. E) chemoautotroph.