Each transport protein is designed to transport a specific substance as needed. Some channel proteins, for example, open only when they receive the correct signal, allowing the substances they transport to flow on demand.
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D. Carbon nitrogen and phosphorus
<h3><u>It helps repair and build your body's tissues, allows metabolic reactions to take place and coordinates bodily functions.</u></h3>
<u> </u><u>A</u><u>ddition to providing your body with a structural framework, proteins also maintain proper pH and fluid balance.</u>
I believe a valley or mountain, but I am not 100 percent sure.
