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17 terms

Important Biology Terms

Terms needed for biology
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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.