Many proto-oncogenes encode ____

a. growth inhibiting factors
b. intracellular receptors


c. tumor suppressor proteins
d. receptors for growth inhibiting factors
e. growth factors


ANSWER: e

Biology & Microbiology

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Mutations of the gene for ?-globin

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Most Swiss starlings produce four to five eggs in each clutch. Those producing fewer or more than this have reduced fitness. Which of the following terms best describes this?

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