Binding of the first messenger to the receptor activates the ____________________, which is a membrane-bound intermediary
Fill in the blank(s) with correct word
G-protein
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________ open or close in response to binding specific molecules
A) Leak channels B) Activated channels C) Chemically gated channels D) Voltage-gated channels E) Voltage-gated and chemically gated channels
The eye measures about ________ in diameter
A. 2.5 mm B. 12.5 mm C. 2.5 cm D. 12.5 cm E. 22.5 cm
"Osmosis" refers to the movement of what substance across semipermeable membranes?
A. Solutes B. Glucose C. Water D. Charged particles E. Lipid molecules
Which of the following substances found in semen is mismatched with its function?
A. fructose - nourishes sperm B. mucous - lubricates urethra C. fibrinogen - transient coagulation of semen D. prostaglandins - cause urethral contractions E. prostaglandins - cause uterine contractions