The mechanism of action of many common medications involves interfering with the normal pathways that cells use to respond to hormone signals. Which of the following best describes a drug interaction that directly interferes with a signal transduction pathway?
(A) A medication causes the cell to absorb more of a particular mineral, eventually poisoning the cell.
(B) A medication enters the target cell and inhibits an enzyme that normally synthesizes a second messenger.
(C) A medication enters the target cell's nucleus and acts as a mutagen.
(D) A medication interrupts the transcription of ribosomal RNA genes.
Ans: (B) A medication enters the target cell and inhibits an enzyme that normally synthesizes a second messenger.
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A. be female because each cell lacks a Y chromosome. B. be male because each cell has only one X chromosome. C. display both male and female characteristics. D. not survive.
For mechanisms of sex determination, which of the following is incorrectly paired?
A. X-Y, cow B. X-O, grasshopper C. ZZ-ZW, bluebird D. 1n-2n, pea plant E. high temperature-low temperature, alligator
Sharks are positively buoyant in seawater
Indicate whether the statement is true or false
If a patient was not having menstrual periods, medical intervention might bring about the shedding of the endometrium by
A) blocking release of FSH. B) blocking release of LH. C) blocking release of HCG. D) blocking release of estrogen and progesterone.