To lower the activation energy required to start a reaction
Complex Ecosystem is all of the different types of plants and animals in an ecosystem
Answer:
Darwin's discussion of bird species on the Galapagos islands relates to natural selection because the finches all have a recent common ancestor, but they evolved on different islands with different types of food, so the birds that weren't fit enough to survive the island conditions died, and the ones that did were "naturally selected."
Explanation:
The finches all have a recent common ancestor but they evolved on different islands where different types of food are available. During his visit to the islands, Darwin noted that the unique creatures were similar from island to island, but perfectly adapted to their environments which led him to ponder the origin of the islands' inhabitants. Among those that struck Darwin so greatly were the finches that are now named in his honor.
Answer:
The best answers to your question, as per the immense amount of research on the topic, would be: The peptides that you would expect to find in the polypeptide that will eventually fold to become an ion channel protein, would be: 1. A signal-anchor peptide, 2. an internal signal peptide and an amino-terminal signal peptide.
Explanation:
Ion channels are transmembrane proteins whose main purpose is to serve as pathways through which different ions, like potassium, or sodium, can cross from both the inside and outside of the cell as it may be required in different circumstances. These proteins, unlike many others, are first translated from genetic material in the cytosol, and then, thanks to signaling sequences on their chain, they will be taken to the ER and Golgi apparatus, where the rest of the translation and the final packaging will be arranged, so that they may be shipped towards their destination, which is the plasma membrane. These proteins, because of their function, need to have a signal-anchor peptide, an internal signal peptide which will direct them to the ER for final assembly and packaging and an amino-terminal signal peptide.
