Localized regions of membrane lipids that contain proteins involved in cell signaling are known as
A) hopanoids.
B) membrane leaflets.
C) homeoviscous adaptations.
D) lipid rafts.
E) islands of hydropathy.
D) lipid rafts.
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A membrane permeable only to water separates two compartments filled with distilled water. Solute is added to one compartment. Osmotic pressure ________
a. all of the choices b. causes the solute to move into the other compartment c. is equal to the amount of force that would need to be applied to that compartment to keep the volume from increasing d. decreases as more solute is added
Which of these features is found in both nonvascular and vascular plants?
a. lignin b. roots c. cuticle d. xylem e. phloem
An orchid benefits by growing on a tree trunk and the tree is unaffected by the orchid's presence. What is this type of reterm describes this relationship?
a. mutualism b. commensalism c. predation d. symbiosis e. herbivory
What form of stimulus will cause the blood
vessels of the skin to relax and increase in diameter?
a. decrease in temperature b. increase in temperature c. electrical stimulus d. mechanical stimulus e. more than one of these