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 Acetyl-CoA Acid Acid rain Acrosome

ACTH (adrenocorticotropic hormone) Actin filaments Actinomycetes Action potential Action spectrum Active transport Activins

Acute lymphoblastic leukemia (ALL) Adaptation

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

ADH, the antidiuretic hormone (also known as vasopressin) Adherens junctions Adhesion

Force of attraction between unlike molecules. Adipose tissue (fat) Adjuvant

Adrenal glands Adrenaline

Adrenocorticotropic hormone (ACTH)

Advanced waste treatment Adventitious root Aequorin Aerobic Affinity Afrotheria

AGAMOUS (AG) Agent Orange Aging Agnatha Agonist

Agrobacterium tumefaciens

AID (Activation-Induced cytidine Deaminase) AIDS (Acquired Immune Deficiency Syndrome) Air

AIRE (autoimmune regulator gene) Alanine Alcohols Aldehydes Aldosterone Algae Alkylation Allantois Allele Allergen Allergy Allograft

Allopatric speciation Allosteric Allozyme

Alpha1-Antitrypsin Alpha helix

Alpha motor neurons Alport's syndrome

Alternation of generations 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 Amniocentesis Amnion Amniota

AMPA receptors Amphetamines Amphibians Amphineura Amphioxus Amphiphilic Amygdala Amylase Amylin Amyloid Amylopectin Amylose

Anabolic steroid Anabolism Anaerobic Analgesics Analogous Anaphase

Anaphase-Promoting Complex/Cyclosome (APC/C) Anaphylaxis Androgen Anemia Anesthetic Aneuploid

Angelman syndrome Angiogenesis Angiosperms Angiotensin

Angiotensin converting enzyme (ACE) Angstrom (?) Animal

Aniridia gene Annelida

ANP (atrial natriuretic peptide)