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A-B-C-D-E-F-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z

A

ABC model of the control of flowering
ABC transporter
ABL gene
ABO blood groups
ABP1 (Auxin-binding protein 1)
Abscisic acid (ABA)
Abscission
Absorption spectrum
Abyssal plain
ACE inhibitors
Acetylcholine
[at neuromuscular junction]
Acetyl-CoA
Acid
Acid rain
Acrosome
ACTH (adrenocorticotropic hormone)
Actin filaments
[Discussion] [in cytokinesis] [in skeletal muscle]
Actinomycetes
Action potential
[in muscle fiber]
Action spectrum
Active transport
Activins
[in embryonic development] [sex hormones]
Acute lymphoblastic leukemia (ALL)
Adaptation
[of sense receptors] [evolutionary]
Adaptive radiation
Addison's disease
Adenine
Adeno-associated virus (AAV).
as vector for somatic gene therapy
Adenomatous Polyposis Coli (APC) gene
Adenosine deaminase (ADA)
and severe combined immunodeficiency (SCID)
Adenosine triphosphate (ATP)
Adenoviruses
Adenylyl cyclase
[and odorant receptors]
ADH, the antidiuretic hormone (also known as vasopressin)
Adherens junctions
Adhesion
Force of attraction between unlike molecules.
Adipose tissue (fat)
[secretion of leptin by]
Adjuvant
Adrenal glands, hormones of
Adrenaline
Adrenocorticotropic hormone (ACTH)
Advanced waste treatment
Adventitious root
Aequorin
Aerobic
Requiring the presence of free oxygen.
Affinity
Strength of binding by noncovalent interactions between one site on a molecule and a monovalent ligand. [antibody affinity] [affinity maturation]
Afrotheria
AGAMOUS (AG)
Agent Orange
Aging
Agnatha
Agonist
Drug that mimics the action of another. [Example]
Agrobacterium tumefaciens
AID (Activation-Induced cytidine Deaminase)
AIDS (Acquired Immune Deficiency Syndrome)
Air
[composition of] [pollution]
AIRE (autoimmune regulator gene)
Alanine
Alcohols
Aldehydes
Aldosterone
Algae
[Brown] [Green] [Golden] [Red] [culture medium for]
Alkylation
Addition of a carbon-containing group, such as a methyl or ethyl group, to another molecule.
Allantois
Allele
Alternative version of a gene. [in Mendel's peas] [in a three-point cross] [RFLPs] [hemoglobin beta chain] [and protein polymorphisms]
Allergen
An antigen that provokes an allergic response.
Allergy
Allograft
Allopatric speciation
Allosteric
Refers to a change in the properties (usually including shape) of a protein following the binding of another molecule to the protein. [Example]
Allozyme
Alpha1-Antitrypsin
[deficiency ] [synthesis by transgenic sheep] [and emphysema]
Alpha helix
Alpha motor neurons
Alport's syndrome
Alternation of generations
[Discussion] [in ferns] [in mosses]
Alternative splicing
Alu element
Aluminum
Alvarez, L.
Alveolates
Alveoli
Alzheimer's disease
Ames Test
Amfor gene
Amides
Amines
Amino acids
Aminoglycosides
Aminopeptidase
Amino terminal
Ammonia
[in nitrogen cycle] [in urea cycle]
Amniocentesis
Amnion
[in humans]
Amniota
AMPA receptors
Amphetamines
Amphibians
Amphineura
Amphioxus
Amphiphilic
Used to describe molecules containing both polar (hydrophilic) and apolar (hydrophobic) groups. Sodium stearate (a soap) is amphiphilic.
Amygdala
Amylase
[pancreatic amylase]
Amylin
Amyloid
Amylopectin
Amylose
Anabolic steroid
Anabolism
Anaerobic
Not requiring the presence of free oxygen.
Analgesics
Analogous
Of structures (e.g., molecules, organs) in different species having similar function(s) but inherited from different precursors.
Anammox (anaerobic ammonia oxidation)
Anaphase
[in mitosis] [in meiosis]
Anaphase-Promoting Complex/Cyclosome (APC/C)
Anaphylaxis
[local] [systemic]
Androgen
Anemia
[immune hemolytic] [pernicious] [sickle-cell]
Anesthetic
Aneuploid
Having one or more extra (or fewer) chromosomes than the normal diploid (2n) set (e.g., 2n+1, 2n-1). [trisomy 21] [X chromosomes]
Angelman syndrome
Angiogenesis
Angiosperms
[life cycle] [evolutionary relationships]
Angiotensin
Angiotensin converting enzyme (ACE)
Angstrom (Å)
Animal
[cells] [invertebrate] [tissues] [vertebrate]
Aniridia gene
Annelida
ANP (atrial natriuretic peptide)
Antennapedia (Antp)
[encoded homeodomain]
Antenna pigments
Anther
Antheridia
[in ferns] [in mosses]
Anthozoa
Anthrax
[how its toxin works]
Antibiotics
Antibody
[structures] [classes] [how their diversity is created] [affinity] [binding to antigen] [monoclonal] [specificity]
Anticodon
Antidepressant drugs
Antidiuretic hormone (ADH)
Antigen
Antigenic determinant
A part of an antigen to which the antibody binds. Also called an epitope. [View]
Antigenic drift of influenza viruses
Antigen presentation
Antigen-Presenting Cells (APCs)
Antigen receptors on B and T cells
Antimicrobial peptides
Antioxidants
Antiport pump.
Antisense strand
The strand of DNA used as the template for synthesizing RNA. (Sometimes called the Watson strand.) [View] [Antisense oligonucleotides] [Antisense RNA]
Antiserum
Serum containing induced antibodies. [Example]
Antithrombin III
Antithymocyte globulin (ATG)
Antitoxin
Aorta
APC gene
APETALA
Apical dominance
Apicomplexa
Apicoplast
Apis mellifera, the honeybee
[life history] [communication]
Aplysia
Apolipoprotein B
[and cholesterol metabolism] [and RNA editing]
Apomixis
Apomorphic
Apoplast
Apoptosis
Programmed cell death. [Discussion]
Aposematic coloration
Appetite, control of
Aquaporin
Aqueous humor
Arabidopsis thaliana
Arachidonic acid
Arachnida
Archaea
Archegonia
[in ferns] [in mosses]
Archenteron
ARF1 (Auxin Response Factor 1)
Arginine
[substrate for NO synthases]
Arrestins
Arteries and Arterioles
Arteriosclerosis
Arthropods
Ascidians
Ascomycetes
Ascorbic acid (vitamin C)
Ascus
Asexual reproduction
Asparagine
Aspartic acid
Assisted Reproductive Technology (ART)
Association constant (K)
Assortative mating
Asthma
Astrocytes
Ataxia telangiectasia
[ATM gene] [and aging]
Atherosclerosis
[and cholesterol]
Atom
Atomic number
Atomic weight unit
One-twelfth the weight of an atom of carbon-12. Also called the dalton. [More]
Atopy
ATP (adenosine triphosphate)
[structure] [yield in cellular respiration]
ATP-binding cassette
ATP synthase
[in photosynthesis] [in mitochondria]
Atrial natriuretic peptide (ANP)
Atrio-ventricular (A-V) node
Atrium
Australopithecus afarensis
Autocrine
Refers to the influence on a cell of molecules synthesized by the same cell. [More]
Autoimmune disease
Disease characterized by the mounting of an immune response against constituents of an individual's own tissues. Some examples: [Goodpasture's Syndrome] [Type 1 diabetes mellitus] [Immune hemolytic anemia] [Immune thrombocytopenic purpura] [Myasthenia gravis (MG)] [Multiple sclerosis (MS)] [Rheumatoid arthritis] [Systemic lupus erythematosus (SLE)] [Thyrotoxicosis (Graves' disease)]
Autonomic nervous system
Autophagy
Autoradiography
Autosome
Any chromosome that is not a sex chromosome.
Autotrophic
Capable of synthesizing organic molecules from inorganic raw materials.
Auxin
[actions] [and tropisms] [differential action on roots and shoots]
Avena test
Avery, O. T.
Avogadro's number
Axial element
Axon
[axon hillock]
Azathioprine
AZT
Azidodeoxythymidine. Also called zidovudine.
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