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These macromolecules could either be amino acids, proteins or nucleic acids. They are responsible for the chemical changes and reactions that affects largely the cell and its composition. Take for instance the cytoplasm of the cell where these organelles are settled. These simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. In intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.
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A. to determine what materials can enter or leave a cell
The mold and the cast are related in that the mold is the object that makes the shape of the cast. Additionally they both hold the shape or part of an organism
When organisms are buried in sediment they may decay or dissolve away leaving a cavity or what we call mold, if the pace is filled with sediment, then an external cast is made. A mold fossil becomes a cast fossil when it is filled with sand or mud and hardens. A mold fossil can turn into a cast fossil, but a cast fossil cannot be a mold.
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