Cell biology

Cell biology

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

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Cell biology

Sporophyte

Biology; Cell biology

The diploid stage of a plant exhibiting alternation of generations. The diploid, spore producing phase of the plant life cycle.

Sporozoans

Biology; Cell biology

Members of the protists that are referred to as slime molds; may include organisms resembling the ancestors of fungi.

Stability

Biology; Cell biology

One of the phases of a population's life cycle. The population's size remains roughly constant, þuctuating around some average density. Also, the ability of a community to persist unchanged.

Spongy bone

Biology; Cell biology

The inner layer of bone; found at the ends of long bones and is less dense than compact bone. Some spongy bone contains red marrow.

Species richness

Biology; Cell biology

The number of species present in a community.

Spermatogenesis

Biology; Cell biology

The development of sperm cells from spermatocytes to mature sperm, including meiosis.

Spinal cord

Biology; Cell biology

A cylinder of nerve tissue extending from the brain stem; receives sensory information and sends output motor signals; with the brain, forms the central nervous system. Nerve cell collections ...