Ecological models can be mathematical or they can be verbally descriptive
Indicate whether the statement is true or false
TRUE
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Various cells in the body respond to the hormone epinephrine in various ways due to ________.
A. cellular respiration B. metabolism C. phosphodiesterase D. protein kinases E. differential gene regulation
How is lac operon transcription regulated by the presence or absence of lactose?
a. When lactose is available, the repressor will bind to allolactose instead of blocking RNA polymerase. b. When lactose is not available, the repressor will bind to the promoter and block RNA polymerase from binding to the promoter. c. When lactose is not available, the repressor will bind to allolactose. d. When lactose is available, allolactose is produced and binds to the operator, blocking RNA polymerase. e. In the absence of lactose, transcription occurs at a low level resulting in the production of allolactose, which in turn stimulates the cell to take up lactose.
Which of the following produces no seeds?
a. cycads b. conifers c. horsetails d. ginkgos e. tomatoes
A simple way of thinking about the action of a steroid hormone on its target cell is that it _____
a. requires no admission to enter b. must find a friend to accompany it in c. can go right in but the admission price is high d. must find a friend to accompany it in and the admission price is high
e. must know the right password to enter and to exit