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| movement of molecules across a membrane from high to low concentration assisted by proteins |
| separation of large and small molecules allowing ions to pass through semipermeable membrane |
chromatid chro·ma·tid (krō'mə-tĭd)
n.
Either of the two daughter strands of a duplicated chromosome that are joined by a single centromere and separate during cell division to become individual chromosomes.
| chromatid (krō'mə-tĭd) Pronunciation Key
Either of the two strands formed when a chromosome duplicates itself as part of the early stages of cell division. The chromatids are joined together by a single centromere and later separate to become individual chromosomes. See more at meiosis, mitosis. |