General

General

General nature or nature terms.

Contributors in General

General

One of the three major cell types in plants. Parenchyma cells have thin, usually multisided walls, are unspecialized but carry on photosynthesis and cellular respiration and can store food; form the ...

plasmids

Biology; General

Self-replicating, circular DNA molecules found in bacterial cells; often used as vectors in recombinant DNA technology. Small circles of double-stranded DNA found in some bacteria. Plasmids can carry ...

parietal lobe

Biology; General

The lobe of the cerebral cortex that lies at the top of the brain; processes information about touch, taste, pressure, pain, and heat and cold.

passive transport

Biology; General

Diffusion across a plasma membrane in which the cell expends no energy.

plasmodesmata

Biology; General

Junctions in plants that penetrate cell walls and plasma membranes, allowing direct communication between the cytoplasm of adjacent cells (sing.: plasmodesma).