Concepts in Biology by Enger-Ross

By Enger-Ross

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This molecule inhibits the production of energy and results in death. Although most atoms can be involved in the structure of an organic molecule, only a few are commonly found. Hydrogen (H) and oxygen (O) are almost always present. Nitrogen (N), sulfur (S), and phosphorus (P) are also very important in specific types of organic molecules. An enormous variety of organic molecules is possible because carbon is able to bond at four different sites, form long chains, and combine with many other kinds of atoms.

Enger−Ross: Concepts in Biology, Tenth Edition 30 Part 2 II. Cells Anatomy and Action 2. Simple Things of Life © The McGraw−Hill Companies, 2002 Cells: Anatomy and Action First energy level Second energy level Na atom 11 P+ 12 N 2 e– 8 e– Na+ ion 11 P+ 11 N 2 e– 8 e– Third energy level 1 e– A balanced charge. 6b). Similarly, chlorine will form a – ion, anion. Oxygen, in the next column, will accept two electrons and become a negative ion with two extra negative charges (O=). If you know the number and position of the electrons, you are better able to hypothesize whether or not an atom will become an ion and, if it does, whether it will be a positive ion or a negative ion.

Each has the same empirical formula, but each has a different structural formula. They will also act differently from each other. of the molecules. Frequently you will find that organic molecules are composed of subunits that are attached to each other. If you recognize the subunit, then the whole organic molecule is much easier to identify. It is similar to distinguishing among the units of a pearl necklace, boat’s anchor chain, and beaded key chain. They are all constructed of individual pieces hooked together.

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