Question

define sessile animals​

Answer 1

Answer:

Biologically speaking, an organism that is sessile (as opposed to motile) lacks the ability of self-locomotion and is predominantly immobile. In zoology, sessility applies to those animals which are attached to a substrate.

Answer 2

A substrate is a molecule acted upon by an enzyme. A substrate is loaded into the active site of the enzyme, or the place that allows weak bonds to be formed between the two molecules. An enzyme substrate complex is formed, and the forces exerted on the substrate by the enzyme cause it to react, and become the product of the intended reaction. The bonds that form between the substrate and enzyme cause the conformational change, or shape change, in the enzyme. The resulting shape change is what applies pressure to the substrate, either forcing molecules together or tearing them apart.

Almost every molecule in our bodies are substrate molecules at some point. Because of the large amount of energy and time required for most reactions to take place, each reaction needs a specific enzyme to help it along. An enzyme does this by lowering the energy required for a reaction to take place between substrate molecules, or within one molecule. Once the reaction has taken place, the substrate is now chemically different, and is called the product. However, many chemicals produced by our bodies are formulated by many smaller steps, known as intermediates, each having its own enzyme. The products of one reaction become the substrate of the next reaction, until the final product is reached. It is in this way that all the materials in our body take shape.