Cell biology

Cell biology

The study of cell structure, physiological properties, interactions with the environment and life cycle.

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Cell biology

archaeocyathids

Biology; Cell biology

An extinct group of animals that were part of Cambrian-aged reef environments, but which were extinct by the close of the Cambrian Period.

archean/proterozoic era

Biology; Cell biology

The period of time beginning 4. 6 billion years ago with the formation of the Earth and ending 570 million years ago.

archaebacteria

Biology; Cell biology

Ancient (over 3. 5 billion years old) group of prokaryotes; some biologists want to place this group into a separate Kingdom, the Archaea. Most currently place it within the Kingdom Monera.

appendix

Biology; Cell biology

Blind sac at the end of the large intestine that usually ruptures during final exams; a vestigial organ in humans.

archaea

Biology; Cell biology

Proposed, but not widely accepted, sixth taxonomic kingdom that would include the archaebacteria.

apocrine glands

Biology; Cell biology

Sweat glands that are located primarily in the armpits and groin area; larger than the more widely distributed eccrine glands.

The bones of the appendages (wings, legs, and arms or fins) and of the pelvic and pectoral girdles that join the appendages to the rest of the skeleton; one of the two components of the skeleton of ...