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.

Biology & Microbiology

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Which of these features is found in both nonvascular and vascular plants?

a. lignin b. roots c. cuticle d. xylem e. phloem

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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

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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

Biology & Microbiology