Important Biology Terms

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Terms needed for biology

Abiotic factors

Nonliving environmental factors.

Absolute dating

Method used to determine fossil age by radioactivity.

Acetylcholine

Neurotransmitter produced by the terminal branched of nerve cell.

Acid

Compound forms hydrogen ions lacking a electron when dissolved in water; pH less than seven.

Addition

Gene mutation; chromosome mutation.

Aerobic respiration

Cellular respiration that requires oxygen and takes place in the mitochondria.

Allele

One of two kinds of genes for a trait.

Alveoli

Tine air sacs.

Amino acid

Organic compound that is the building block of proteins.

Anaerobic respiration

Cellular respiration that does not require oxygen and takes place in the cytoplasm outside the mitochondria.

Analogous structures

Structures that are similar in function but dissimilar in construction and evolutionary development.

Anther

Part of the stamen of a flower and the producer of pollen grains.

Anthophyta

Phylum in kingdom Plantae that includes flowering plants that usually reproduce by seeds hidden inside fruits.

Antibiotic

Substance produced by some bacteria or fungi that can destroy bacteria but not viruses.

Antibody

Protein in the blood that can help fight disease by destroying harmful substances such as antigens, bacteria and viruses.

Anticodon

Side of tRNA that is complementary to the codon on an mRNA molecule.

Archaea

Domain that includes prokaryotic unicellular organisms with cell walls lacking peptidoglycan.

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