Antibiotic resistance
Antibiotic resistance is the ability of a microorganism to withstand the effects of an
antibiotic. It is a specific type of drug resistance.
Antibody
An antigen-binding immunoglobulin, produced by B cells, that functions as the effector in an
immune response.
Anticodon
A specialized base triplet on one end of a tRNA molecule that recognizes a particular
complementary codon on an mRNA molecule.
Antidiuretic hormone (ADH)
A hormone important in osmoregulation.
Antigen
A foreign macromolecule that does not belong to the host organism and that elicits an
immune response.
Anus
The opening at the lower end of the digestive tract through which solid waste is excreated.
Anurans
Any of numerous tailless, aquatic, semiaquatic, or terrestrial amphibians of the order Anura
and especially of the family Ranidae, characteristically having a smooth moist skin, webbed
feet, and long hind legs adapted for leaping.
Aorta
The major artery in blood-circulating systems; the aorta sends blood to the other body
tissues.
Appendicular
Elating to, or consisting of an appendage or appendages, especially the limbs: the
appendicular skeleton.
Aphotic zone
The part of the ocean beneath the photic zone, where light does not penetrate sufficiently
for photosynthesis to occur.
Apical dominance
Concentration of growth at the tip of a plant shoot, where a terminal bud partially inhibits
axillary bud growth.
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