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I

IAA (Indole-3-acetic acid)
ICAM-1 (InterCellular Adehesion Molecule-1)
I-cell disease ("inclusion-cell disease")
IgA
A class of antibody molecules abundant in tears, colostrum, and other secretions. [More]
IgE
A class of antibodies responsible for certain immediate hypersensitivities (allergies). [More]
IgG
The class of antibody molecules that is most abundant in the blood. [More]
Ilyanassa obsoleta
Imatinib mesylate (also known as Gleevec® and STI571)
Immune globulin (IG)
Immune privilege
Immune surveillance
Immune System
[anatomy] [antigen receptors] [B cells and T cells] [clonal selection] [generation of antigen receptor diversity]
Immunity
[adaptive vs. innate] [adaptive immunity in prokaryotes] [cell-mediated] [active vs. passive] [complete list of topics]
Immunological memory
Immunological synapse
Immunological tolerance
The inability to produce antibodies and/or a cell-mediated immune response to a particular antigen.
Immunosuppression
The use of drugs or other agent (e.g., x rays) to inhibit an immune response. [More]
Immunotoxin
Impact hypothesis
Implantation
Imprinting
[genomic or parental (the preferential expression of the allele inherited from one parent or the other)] [in animal behavior]
Inbreeding
Incretins
Indels
Independent assortment of genes
Indian pipe
Indole-3-acetic acid
Industrial melanism
Inflammasome
Inflammation
Influenza
Ingestion
Inhibitory postsynaptic potential (IPSP)
Inner Cell Mass
[of mouse blastocyst] [of human blastocyst]
Inorganic
Term describing all compounds that do not contain carbon as well as a few simple carbon-containing substances such as carbon dioxide and the carbonates.
Inositol-1,4,5-trisphosphate (IP3)
Insecticides
Insects
[insect hormones] [orders of]
Insertions (in DNA)
Instincts
Insulators
Insulin
Insulin-like growth factor
[Igf-1] [Imprinting of Igf-2 gene (as well as that of its receptor)]
Integral membrane proteins
Integrase
Integrins
[and angiogenesis]
Inteins
Interferon-gamma (IFN-γ)
Interleukins
Cytokines that regulate development and activities of leukocytes. [in blood cell formation] [interactions with helper T cells]
Intermediate filaments
Intermediate host
Host normally used by a parasite during an immature or larval stage of the parasite's life cycle. [of tapeworms] [of blood flukes]
Interneuron
Interphase
Interstitial fluid
The fluid lying between, and thus bathing, the cells of animals. Interstitial fluid (also called extracellular fluid — ECF) is derived from blood. Lymph is derived from it.
Intertidal zone
Intestine
Intracytoplasmic Sperm Injection (ICSI)
Intrauterine devices (IUDs)
Intrinsic factor
Introgression
Intron
Portion of a gene that is transcribed into RNA but is removed during the formation of the mature RNA molecule. Found in rRNA and tRNA genes as well as in genes encoding proteins. Most eukaryotic genes have introns; most genes in bacteria and archaeons do not. [More] [Group I] [Group II]
Invariant (Ii) chain
Invertebrates
Inverted repeats
In vitro
Done in the "test tube".
In Vitro Fertilization (IVF)
[prior genetic screening]
In vivo
Refers to experiments performed in the living organism.
Iodine
Ion
Atom or group of atoms that has an electrical charge arising from the gain or loss of electrons.
Ion channels in cell membranes
Ionic bond
Chemical bond formed between ions of opposite charge. [More]
Iron
[nutritional requirement]
Islets of Langerhans
Isoleucine
Isomer
Molecule with the same molecular formula as another but with a different structural formula (e.g., glucose and fructose). [optical isomers]
Isometric
The contraction, without shortening, of a muscle. [More]
Isotonic
(1) Adjective to describe the contraction of a muscle that is allowed to shorten as it exerts a steady force. (2) Having the same concentration of water as the solution under comparison. (More)
Isotope
Atom that differs in weight from other atoms of the same element because of a different number of neutrons in its nucleus. [Discussion]
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