Browse categories
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Anatomy
1,049 questions A branch of biology dealing with the structure of organisms.
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Organisms
388 questions Any living biological entity, such as an animal, plant, fungus, or bacterium.
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Diseases
1,356 questions Any impairment of normal physiological function affecting all or part of an organism, esp a specific pathological change caused by infection, stress, etc, producing characteristic symptoms; illness or sickness in general.
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Chemicals and Drugs
853 questions Any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use and any synthetic, semisynthetic, or natural chemical substance used in the treatment, prevention, or diagnosis of disease, or for other medical reasons.
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Inorganic Chemicals
18 questions A broad class of substances encompassing all those that do not include carbon and its derivatives as their principal elements. However, carbides, carbonates, cyanides, cyanates, and carbon disulfide are included in this class.
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Organic Chemicals
128 questions A broad class of substances containing carbon and its derivatives. Many of these chemicals will frequently contain hydrogen with or without oxygen, nitrogen, sulfur, phosphorus, and other elements. They exist in either carbon chain or carbon ring form.
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Heterocyclic Compounds
63 questions Ring compounds having atoms other than carbon in their nuclei. (Grant & Hackh's Chemical Dictionary, 5th ed)
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Polycyclic Compounds
17 questions Compounds consisting of two or more fused ring structures.
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Macromolecular Substances
4 questions Compounds and molecular complexes that consist of very large numbers of atoms and are generally over 500 kDa in size. In biological systems macromolecular substances usually can be visualized using ELECTRON MICROSCOPY and are distinguished from ORGANELLES by the lack of a membrane structure.
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Hormones, Hormone Substitutes, and Hormone Antagonists
8 questions A collective grouping for both naturally occurring and synthetic hormones, substitutes, and antagonists.
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Enzymes and Coenzymes
21 questions Biological catalysts and their cofactors.
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Carbohydrates
13 questions The largest class of organic compounds, including STARCH; GLYCOGEN; CELLULOSE; POLYSACCHARIDES; and simple MONOSACCHARIDES. Carbohydrates are composed of carbon, hydrogen, and oxygen in a ratio of Cn(H2O)n.
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Lipids
6 questions A generic term for fats and lipoids, the alcohol-ether-soluble constituents of protoplasm, which are insoluble in water. They comprise the fats, fatty oils, essential oils, waxes, phospholipids, glycolipids, sulfolipids, aminolipids, chromolipids (lipochromes), and fatty acids. (Grant & Hackh's Chemical Dictionary, 5th ed)
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Amino Acids, Peptides, and Proteins
22 questions Amino acids and chains of amino acids connected by peptide linkages.
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Nucleic Acids, Nucleotides, and Nucleosides
0 questions Complex compounds of high molecular weight occurring in living cells. These are basically of two types, ribonucleic (RNA) and deoxyribonucleic (DNA) acids, both of which consist of nucleotides (nucleoside phosphates linked together by phosphate bridges).
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Complex Mixtures
6 questions Mixtures of many components in inexact proportions, usually natural, such as PLANT EXTRACTS; VENOMS; and MANURE. These are distinguished from DRUG COMBINATIONS which have only a few components in definite proportions.
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Biological Factors
10 questions Endogenously-synthesized compounds that may influence biological phenomena or represent quantifiable biomarkers. Biological factors are a variety of extracellular substances that are not otherwise classified under ENZYMES; HORMONES or HORMONE ANTAGONISTS
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Biomedical and Dental Materials
9 questions Substances used in biomedicine or dentistry predominantly for their physical, as opposed to chemical, properties.
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Pharmaceutical Preparations
151 questions Drugs intended for human or veterinary use, presented in their finished dosage form. Included here are materials used in the preparation and/or formulation of the finished dosage form.
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Chemical Actions and Uses
19 questions A group of pharmacologic activities, effects on living systems and the environment, and modes of employment of drugs and chemicals. They are broken into actions, which describe their effects, and uses, which describe how they are employed.
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Analytical, Diagnostic and Therapeutic Techniques and Equipment
359 questions
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Psychiatry and Psychology
162 questions The branches of medicine concerned with the diagnosis and treatment of mental illness and the scientific study of all forms of human and animal behaviour, sometimes concerned with the methods through which behaviour can be modified.
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Phenomena and Processes
97 questions
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Disciplines and Occupations
28 questions
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Anthropology, Education, Sociology and Social Phenomena
98 questions
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Technology, Industry, Agriculture
84 questions
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Humanities
80 questions The study of literature, philosophy, and the arts.
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Information Science
219 questions The field of knowledge, theory, and technology dealing with the collection of facts and figures, and the processes and methods involved in their manipulation, storage, dissemination, publication, and retrieval. It includes the fields of COMMUNICATION; PUBLISHING; LIBRARY SCIENCE; and informatics.
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Named Groups
38 questions
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Health Care
1,264 questions
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Publication Characteristics
30 questions
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Geographicals
23 questions The study of the natural features of the earth's surface, including topography, climate, soil, vegetation, etc, and man's response to them.
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