Which choice describes the activation steps of a G protein-coupled receptor properly (and in correct order)?
A. Ligand binds to receptor, G protein activated, effector protein activated, second messenger made available
B. Ligand binds to receptor, second messenger activated, G protein turned on, protein kinase activated
C. Protein kinase activated, ion channel opened, ions enter and activate second messenger, G protein turned on
D. Ion channel opened, G protein activated, second messenger synthesized, phosphatase ends signal
A
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Menopause is due to aging of the
A) uterine tube. B) cervix. C) ovaries. D) vagina.
Which of these is NOT and example of chemical bond?
A.ionic bond B.atomic bond C.covalent bond D.hydrogen bond
A timeline containing substances someone ingests or becomes exposed to can be found in the ________.
A. hair B. bones C. teeth D. eyes
The entire sequence of events involved in the exchange of O2 and CO2 between the body cells and the surrounding environment is known as
a. internal respiration b. external respiration c. ventilation d. breathing e. ventilation and breathing