Which substance is not a known carcinogen?
A) certain viruses
B) ultraviolet light
C) cigarette smoke
D) pet dander
D
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Transformation is not useful in determining relatedness between two organisms because it frequently crosses genera.
Answer the following statement true (T) or false (F)
The concentration of nutrients in estuaries causes____ productivity
a. extremely low b. low c. average d. medium e. high
Which list describes the correct sequence of events involved in cell signaling?
a. signal transduction, reception, signal transmission, response b. response, signal transduction, signal transmission, reception c. signal transmission, signal transduction, reception, response d. reception, signal transmission, response, signal transduction e. signal transmission, reception, signal transduction, response
Which of the following statements regarding the cell-mediated immune response is TRUE?
A. Cytotoxic T lymphocytes do not require antigen presentation to become activated. B. Cytotoxic T lymphocytes interact with antibodies that have bound antigen to identify their target. C. Helper T lymphocytes have no role in the activation of cytotoxic T lymphocytes. D. Cytotoxic T lymphocytes kill by producing hydrogen peroxide. E. A single cytotoxic T lymphocyte can kill many target cells.