Steroid hormones
A. are very soluble in water.
B. are soluble in lipids.
C. must interact with membrane receptors because they are never membrane permeable.
D. include epinephrine and norepinephrine.
Answer: B
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Intramembranous ossification begins with differentiation of ________ cells
A) osteoclast B) osteolytic C) mesenchymal D) osteoblast E) osteocyte
Which of the following is the correct mRNA produced from the transcription of this DNA molecule?
A. 5'-AUGAUCGGAUCGAUCCAU-3' B. 3'-AUGAUCGGAUCGAUCCAU-5' C. 5'-UACUAGCCUAGCUAGGUA-3' D. 3'-UACUAGCCUAGCUAGGUA-5'
In the salamander, the sour taste receptor cells function by having an apically localized K+ channel that is blocked by protons. When protons are applied, what happens to the membrane potential and why?
A) Receptor depolarization because K+ permeability, which normally maintains a hyperpolarized resting state is reduced. B) Receptor hyperpolarization because H+ ions move into the cell and render it more positively charged. C) Receptor hyperpolarization because the H+ ions outside the cell make the inside of the cell more negatively charged. D) Nothing will happen until the G-protein is activated.
Voluntary control of micturition involves controlling somatic motor input to the muscles of the external urethral sphincter.
Answer the following statement true (T) or false (F)