Overview
| Molecule/Component | Domain/Context | Class | Formula/Composition | Immediate role | Upstream inputs | Downstream outputs |
|---|---|---|---|---|---|---|
| Adenine | Genetic code | Nucleobase (purine) | C5H5N5 | DNA/RNA base; pairs with T/U | Purine biosynthesis | ATP, dATP, RNA, DNA |
| Guanine | Genetic code | Nucleobase (purine) | C5H5N5O | DNA/RNA base; pairs with C | Purine biosynthesis | GTP, dGTP, RNA, DNA |
| Cytosine | Genetic code | Nucleobase (pyrimidine) | C4H5N3O | DNA/RNA base; pairs with G | Pyrimidine biosynthesis | CTP, dCTP, RNA, DNA |
| Thymine | Genetic code | Nucleobase (pyrimidine) | C5H6N2O2 | DNA base; pairs with A | Pyrimidine biosynthesis | dTTP, DNA |
| Uracil | Genetic code | Nucleobase (pyrimidine) | C4H4N2O2 | RNA base; pairs with A | Pyrimidine biosynthesis | UTP, RNA |
| ATP | All domains | Nucleotide triphosphate | C10H16N5O13P3 | Energy currency | Respiration, photosynthesis | ADP + Pi, RNA synthesis |
| GTP | Genetic code | Nucleotide triphosphate | C10H16N5O14P3 | Translation energy, RNA synthesis | TCA cycle, kinases | GDP, RNA synthesis |
| Alanine | Genetic code | Amino acid | C3H7NO2 | Protein building block | Amino acid biosynthesis | Proteins |
| Selenocysteine | Genetic code | Amino acid | C3H7NO2Se | Special amino acid at UGA codon | Ser-tRNA^Sec + Se | Selenoproteins |
| Pyrrolysine | Genetic code | Amino acid | C12H21N3O3 | Special amino acid at UAG codon | Lysine derivatives | Pyl-containing enzymes |
| mRNA | Genetic code | RNA polymer | Variable | Codon carrier | DNA transcription | Protein synthesis |
| tRNA | Genetic code | RNA polymer | Variable | Delivers amino acids | tRNA transcription + aminoacylation | Translation elongation |
| Ribosome | Genetic code | Ribonucleoprotein | Variable | Translates mRNA | rRNA + ribosomal proteins | Proteins |
| Chitin | Mycelium | Structural polysaccharide | (C8H13O5N)n | Fungal cell wall polymer | UDP-N-acetylglucosamine | Cell wall |
| β-1,3-glucan | Mycelium | Structural polysaccharide | (C6H10O5)n | Cell wall strength | UDP-glucose | Glucan network |
| Ergosterol | Mycelium | Sterol lipid | C28H44O | Membrane fluidity | Mevalonate pathway | Membrane rafts |
| Lignin peroxidase | Mycelium | Enzyme | Protein | Lignin degradation | Gene expression + heme | Aromatic breakdown products |
| Cellulose | Algae/Soil | Structural polysaccharide | (C6H10O5)n | Structural polymer | UDP-glucose | Microfibrils, glucose |
| Agarose | Algae | Structural polysaccharide | Agarobiose units | Red algae cell wall | Galactose metabolism | Agar gel |
| Carrageenan | Algae | Sulfated polysaccharide | (C12H18O9S)n | Gel-forming wall polysaccharide | Galactose + sulfate | ECM gels |
| Alginate | Algae | Structural polysaccharide | Mannuronic + guluronic acids | Brown algae matrix | Mannuronic acid biosynthesis | Alginate fibers/gels |
| Chlorophyll a | Algae | Pigment (porphyrin) | C55H72MgN4O5 | Primary photosynthetic pigment | Tetrapyrrole biosynthesis | Electron transfer |
| Fucoxanthin | Algae | Carotenoid pigment | C42H58O6 | Brown algae accessory pigment | Isoprenoid pathway | Photoprotection |
| β-carotene | Algae | Carotenoid pigment | C40H56 | Antioxidant pigment | Isoprenoid pathway | Vitamin A |
| Dimethylsulfoniopropionate (DMSP) | Algae | Secondary metabolite | C5H10O2S | Osmolyte, sulfur cycle | Methionine metabolism | Dimethyl sulfide |
| Quartz | Inorganic minerals | Silicate mineral | SiO2 | Soil structure | Weathering of rocks | Soil framework |
| Feldspar (orthoclase) | Inorganic minerals | Aluminosilicate mineral | KAlSi3O8 | K+, Al, Si source | Rock weathering | Clays, K+ |
| Feldspar (plagioclase) | Inorganic minerals | Aluminosilicate mineral | NaAlSi3O8–CaAl2Si2O8 | Na+, Ca2+ source | Rock weathering | Clays, Na+, Ca2+ |
| Kaolinite | Inorganic minerals | Clay mineral | Al2Si2O5(OH)4 | Stable clay, low CEC | Feldspar weathering | Clay fraction |
| Calcite | Inorganic minerals | Carbonate mineral | CaCO3 | pH buffer, Ca2+ source | Limestone weathering | Ca2+, CO2 |
| Dolomite | Inorganic minerals | Carbonate mineral | CaMg(CO3)2 | Mg2+, Ca2+ source | Dolostone weathering | Ca2+, Mg2+ |
| Gypsum | Inorganic minerals | Sulfate mineral | CaSO4·2H2O | Ca2+, S source | Evaporite dissolution | Ca2+, SO4^2- |
| Apatite | Inorganic minerals | Phosphate mineral | Ca5(PO4)3F/OH | P source | Rock weathering | PO4^3- |
| Calcium oxalate | Organic minerals | Biomineral | CaC2O4·xH2O | Ca storage/regulation | Oxalic acid + Ca2+ | Crystals |
| Struvite | Organic minerals | Biomineral | MgNH4PO4·6H2O | Nutrient store | Mg2+ + NH4+ + PO4^3- | Fertilizer |
| Chlorophyll–Mg complex | Organic minerals | Metalloporphyrin | C55H72MgN4O5 | Photosynthesis | Tetrapyrrole + Mg2+ | Electron transfer |
| Hemoglobin/heme–Fe complex | Organic minerals | Metalloporphyrin | C34H32FeN4O4 | O2 transport | Porphyrin synthesis + Fe2+ | Oxyhemoglobin |
| Vitamin B12–Co complex | Organic minerals | Corrinoid | C63H88CoN14O14P | Cofactor | Corrin ring + Co2+ | Methylation reactions |
| Glucose | Organic chemicals | Monosaccharide | C6H12O6 | Energy source | Photosynthesis, hydrolysis | Glycolysis |
| Sucrose | Organic chemicals | Disaccharide | C12H22O11 | Transport sugar | Photosynthesis | Energy in sinks |
| Starch | Organic chemicals | Polysaccharide | (C6H10O5)n | Energy storage | Photosynthesis | Glucose |
| Fatty acids | Organic chemicals | Lipid | Variable | Membrane/energy | Acetyl-CoA | Lipids, β-oxidation |
| Triacylglycerol (TAG) | Organic chemicals | Lipid | Glycerol + 3 FAs | Energy storage | FA synthesis | FAs via lipases |
| Phospholipids | Organic chemicals | Lipid | Variable | Membranes | FA + glycerol + phosphate | Bilayers |
| Sterols | Organic chemicals | Lipid | C27–C28 | Membrane fluidity, hormones | Isoprenoid biosynthesis | Hormones, vit D |
| Phenolic acids | Organic chemicals | Aromatic acids | Variable | Antioxidants | Phenylpropanoid pathway | Lignin, tannins |
| Terpenes | Organic chemicals | Isoprenoid | C10–C15 | Signals, defense | Isoprenoid pathway | Aroma compounds |
| Water | Inorganic chemicals | Polar molecule | H2O | Solvent, reactant | Precipitation, metabolism | Hydrolysis products |
| Oxygen gas | Inorganic chemicals | Diatomic molecule | O2 | Respiration, oxidation | Photosynthesis | H2O, ROS |
| Carbon dioxide | Inorganic chemicals | Linear molecule | CO2 | C source for photosynthesis | Respiration | Carbohydrates |
| Nitrogen gas | Inorganic chemicals | Diatomic molecule | N2 | N fixation source | Atmosphere | NH3, organic N |
| Ammonia | Inorganic chemicals | Inorganic base | NH3/NH4+ | N nutrient | N fixation, mineralization | Nitrate, amino acids |
| Nitrate ion | Inorganic chemicals | Inorganic anion | NO3- | N nutrient | Nitrification | Organic N |
| Phosphate ion | Inorganic chemicals | Inorganic oxyanion | PO4^3- | ATP/nucleic acids | Weathering, mineralization | Biomass P |
| Sulfate ion | Inorganic chemicals | Inorganic oxyanion | SO4^2- | S nutrient, e- acceptor | Weathering, mineralization | Sulfide |
| Chloride ion | Inorganic chemicals | Inorganic anion | Cl- | Osmotic balance | Halite dissolution | Biomass Cl |
| Sodium ion | Inorganic chemicals | Inorganic cation | Na+ | Osmotic balance | Halite dissolution | Ion gradients |
| Potassium ion | Inorganic chemicals | Inorganic cation | K+ | Nutrient | Feldspar/mica weathering | Biomass K |
| Calcium ion | Inorganic chemicals | Inorganic cation | Ca2+ | Cell wall, signaling | Calcite/dolomite weathering | Ca salts |
| Magnesium ion | Inorganic chemicals | Inorganic cation | Mg2+ | Chlorophyll central atom | Dolomite/olivine weathering | Biomass Mg |
| Iron (ferrous) ion | Inorganic chemicals | Inorganic cation | Fe2+ | e- donor, cofactor | Reducing mineral dissolution | Fe3+ |
| Iron (ferric) ion | Inorganic chemicals | Inorganic cation | Fe3+ | e- acceptor, cofactor | Fe2+ oxidation | Fe oxides |
| Zinc ion | Inorganic chemicals | Inorganic cation | Zn2+ | Cofactor | Mineral weathering | Biomass Zn |
| Copper ion | Inorganic chemicals | Inorganic cation | Cu+/Cu2+ | Electron transfer | Mineral weathering | Biomass Cu |
| Cobalt ion | Inorganic chemicals | Inorganic cation | Co2+ | Cofactor (B12) | Mineral weathering | Corrinoids |
| Hydrogen ion | Inorganic chemicals | Inorganic ion | H+ | pH control, proton motive force | Acid dissociation | Water, gradients |
| Hydroxide ion | Inorganic chemicals | Inorganic ion | OH- | pH control, base catalysis | Water autoprotolysis | Water, hydroxides |
Notes:
- Genetic Code system(nucleic acids, amino acids, ribosome machinery)
- Mycelium(fungal structural/metabolic biochemistry)
- Algae(photosynthetic pigments, storage polysaccharides, metabolites)
- Soil(organic matter, biotic molecules)
- Organic Minerals(organo-mineral complexes, biominerals, metallopigments)
- Inorganic Minerals(primary & secondary mineral phases)
- Organic Chemicals(general biological organics across domains)
- Inorganic Chemicals(free ions & small molecules in biogeochemical cycles)
Key terms in plain language
Open a term for a concise explanation of language used on this page.
Cloud Computing
Computing resources—such as applications, servers, storage, or databases—delivered from remote infrastructure and scaled as requirements change.
Infrastructure as a Service (IaaS)
Cloud-based servers, storage, and networking that customers configure and manage without owning the underlying data-center hardware.
Software as a Service (SaaS)
Software accessed as an online service instead of being installed and maintained entirely on the customer’s own computers or servers.
Disaster Recovery (DRaaS)
A plan and service for restoring applications, data, and operations after an outage or disruption. DRaaS provides recovery infrastructure through a managed cloud service.
Identity and Access Management (IAM)
The systems and policies that determine who a user is, what resources they may access, and how that access is authenticated and reviewed.
API
An application programming interface is a defined way for software systems to exchange data or request functions from one another.