To translate the three enzymes of the lac operon, ________ mRNA molecule(s) is/are transcribed

A) 3 B) 0 C) 1 D) 4 E) 2


Answer: C

Biology & Microbiology

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Freon, CCl2F2, is _____ because _____.

A. a structural isomer...there are several possible covalent arrangements B. a geometric isomer...free rotation about the bond axis is not possible C. an enantiomer...the carbon is asymmetric D. an enantiomer...the molecule exists in two mirror-image configurations E. not an isomer...there is only one structural configuration for the molecule

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The posterior pituitary gland receives hormone messages from the hypothalamus via _______.

a. a capillary network b. neurons that extend from the hypothalamus to the pituitary c. Schwann cells d. both a & b

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Koplik spots are a diagnostic indicator of

A) chickenpox. B) smallpox. C) fifth disease. D) rubella. E) measles.

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During the mating season, male stickleback fish will respond to clay models with red bellies. The red belly

A. is a sign stimulus. B. results in an operant conditioning response. C. is a fixed action stimulus. D. is an innate releasing stimulus.

Biology & Microbiology