Carbon Skeleton
Carbon Skeleton - Related Videos
01:28
Carbon Skeletons
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2026
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side chains...
08:02
Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
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Cited by 18 •
2016
The branchial skeleton, including gill rakers, pharyngeal teeth, and branchial bones, serves as the primary site of food processing in most fish. Here we describe a protocol to dissect and flat-mount this internal skeleton in threespine sticklebacks. This method is also applicable to a variety of other fish species.
01:14
The Carbon Cycle
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2019
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle. Biological Carbon Cycle All...
01:21
Skeleton and Calcium Homeostasis
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2023
Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
01:09
Overview of the Axial Skeleton
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2025
The skeleton is subdivided into two major divisions—the axial skeleton and the appendicular skeleton. The axial skeleton forms the vertical, central axis of the body. It includes all of the bones of the head, neck, chest, and back. It protects the brain, spinal cord, heart, and lungs. It also serves as the attachment site for muscles that move the head, neck, and back and for muscles that act across the shoulder and hip joints to move their corresponding limbs. The axial skeleton of the adult...
FAQs
Carbon’s ability to form four stable covalent bonds allows a framework to extend, branch, or close into a ring while maintaining a stable molecular structure. These bonding possibilities create many distinct arrangements from carbon atoms, helping account for the structural diversity of organic molecules. In biology, that diversity supports different molecular forms and contributes to isomerism.
Length, branching, and ring formation change the arrangement of a carbon skeleton and contribute to structural variation. This variation helps explain isomerism, in which molecules differ in arrangement. Examining these features shows why organic molecules can have distinct structures even when their carbon-based frameworks share broad similarities.
Functional groups do not replace the carbon framework; they attach to it and help determine the molecule’s chemical properties. Consequently, molecules with related carbon skeletons may differ when their attached groups differ. Considering the framework together with its functional groups provides a more complete way to interpret biological molecules.
During metabolism, cells can rearrange carbon skeletons rather than simply preserve them unchanged. This flexibility connects the breakdown and rebuilding of organic molecules, allowing carbon frameworks to participate in pathways that convert nutrients into energy or cellular materials. Following these rearrangements helps explain how molecular structure relates to cellular metabolism.
The same structural principle appears across carbohydrates, lipids, amino acids, and nucleic acids, but the resulting molecules are not organized identically. Their carbon frameworks provide a basis for overall molecular structure, while attached hydrogens and functional groups contribute to chemical properties. Comparing these classes shows how carbon supports varied biological materials.
Begin by identifying whether the framework is arranged as a chain, ring, or branched structure, then consider its length and the groups attached to it. Relating these features to the molecule’s class and to any metabolic rearrangement can clarify its structure, chemical properties, biological role, and participation in cellular pathways.