Examlex
The ability of a sponge cell to identify other such sponge cells is called cell ______________________.
Enzymes
Biological molecules that significantly speed up the rate of virtually all of the chemical reactions that take place within cells.
Tubules
Small tubes or tunnel-like structures found in various organs and tissues, involved in transport and filtration processes.
Nuclear Receptor
A type of intracellular protein that, upon binding to specific molecules, can regulate the expression of certain genes.
Membrane-bound Receptor
A protein molecule embedded in the cell membrane that receives chemical signals from outside the cell and, upon binding with a specific ligand, initiates a cellular response.
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