Important Biology Terms
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17 terms
Terms | Definitions |
|---|---|
 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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