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
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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
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
Koplik spots are a diagnostic indicator of
A) chickenpox. B) smallpox. C) fifth disease. D) rubella. E) measles.
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.