Which of the following statements about cancer is false?

(a) Viruses cause some cancers.
(b) Tobacco use is responsible for more than 20% of all cancer deaths.
(c) A mutation in even a single cancer-critical gene is sufficient to convert a normal cell into a cancer cell.
(d) Chemical carcinogens cause cancer by changing the nucleotide sequence of DNA.


(c) Multiple mutations are required to convert a normal cell into a cell that has all the properties needed to make it cancerous.

Biology & Microbiology

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In transmission electron microscopy, spreading a specimen out in a thin film with uranyl acetate, which does not penetrate the specimen, is called ________.

A. shadow staining B. freeze-etching C. negative staining D. simple staining

Biology & Microbiology