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:
Fossils can give information about past environmental conditions by showing the type of animal they belonged to. If a scientist found a whale fossil in a desert, he/she could assume that the desert was once an ocean as whales only live in oceans. If someone found a fossil of a lizard that inhabited trees, in the middle of the ocean, then he/she could assume that the ocean didn't exist at one point and instead, there might have been a forest in it's place.
Hope this helps!
I believe that the best answer would be Dg. Based on the law of independent assortment, during meiosis, any allele from one trait can end up in the same gamete with any allele from another trait, Such that in this case the individual with genotype DdGg can produce DG, Dg, dG, or dg gametes, only applies to genes that are not linked on the same chromosome.
Yes, they do. Many plants will have seed pods (like dandelions) that fly away or drop off. This helps distribute the seeds and promotes more plants being grown elsewhere. Another adaptation would be having their seeds inside fruits. This causes other animals to eat it and distribute the seeds that way in their waste.
<span>when white light travels from air into water particles,the light is bent or refracted depending on the speed of the light</span>
