<span>Angiosperms are flowering plants.It is the most diverse group of plants with more than 250,000 species. They are called angipsperms because their seeds are enclosed in a carpel (in a vessel).
Angiosperms are the most diverse and successful plant group today because the reproduction is aided by flowers, protected seeds and insect pollinators (A). The flower lures insects, birds, bats to itself, and in the process has dramatically increased the diversity of flowering plants.Closed carpel allow seed protection.</span><span />
Answer:
-Histamine binds extracellularly to the H1 receptor.
-When histamine binds to the H1 receptor. the receptor undergoes a conformation change and binds the inactive G protein.
-Once the G protein is active, it binds to the enzyme phospholipase C, activating it.
-Histamine is likely hydrophilic.
When histamine encounters a target cell, it binds extracellularly to the H1 receptor, causing a change in the shape of the receptor. This change in shape allows the G protein to bind to the H1 receptor, causing a GTP molecule to displace a GDP molecule and activating the G protein. The active G protein dissociates from the H1 receptor and binds to the enzyme phospholipase C, activating it. The active phospholipase C triggers a cellular response. The G protein then functions as a GTPase and hydrolyzes the GTP to GDP. The G protein dissociates from the enzyme and is inactive again and ready for reuse.
Explanation:
Answer:
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Explanation:
