Organic compounds, those that are
Blank
______-based, are the foundation of organisms.

Question

Organic compounds, those that are 
Blank
______-based,  are the foundation of organisms.

BlackTom AI · Accepted Answer

Organic compounds are carbon-based, so carbon is the correct choice.

Relevant concepts: "Organic" in chemistry refers to compounds whose structures are built primarily from carbon atoms. Carbon's unique bonding properties—tetravalence (four valence electrons), strong C–C bond energy, and ability to catenate (form long chains and rings)—allow a vast variety of stable, complex molecules. These properties enable the functional groups and polymeric structures that make up biomolecules: carbohydrates, lipids, proteins, and nucleic acids are all primarily composed of carbon skeletons with hydrogen, oxygen, nitrogen, phosphorus and other elements attached.

Step-by-step reasoning:
1. Define organic compound: historically linked to living things, but modern definition centers on compounds containing carbon (with a few exceptions). Thus the base element is carbon.
2. Examine carbon’s properties: with four bonds it can form single, double, triple bonds and long chains—this chemical versatility produces the huge diversity of organic molecules needed for life.
3. Consider biological macromolecules: sugars, fatty acids, amino acids, and nucleotides all have carbon backbones. Even when other elements (N, P, S) are present, they are typically attached to carbon frameworks.
4. Evaluate the answer choices: phosphorus and nitrogen are important elements in biology (phosphorus in ATP and DNA backbones; nitrogen in amino groups and nucleobases) but they do not serve as the primary backbone element that defines “organic” compounds.

Why carbon is correct: the term "organic" is synonymous with carbon-containing frameworks in standard chemistry and biology contexts. Nitrogen and phosphorus are essential heteroatoms within organic molecules but are not the foundational element that permits the structural diversity labeled “organic.”

Other options: Nitrogen—commonly found in organic molecules but lacks carbon’s catenation and tetravalent versatility to be the defining backbone. Phosphorus—critical in specific biomolecules (DNA backbone, ATP) but not the general structural basis of organic chemistry.

Therefore the blank should be filled with "carbon," confirming the provided answer.

Organic compounds, those that are Blank ______-based, are the foundation of organisms.单项选择题

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