| polysome |
a cluster of ribosomes along a heavily translated sequence of messenger RNA making protein in a cell; polyribosome. |
| prion |
any infectious agent composed of misfolded protein, such as the misfolded protein that causes "mad cow disease." |
| protease |
any enzyme that stimulates the digestion of protein. |
| proteinuria |
the presence of excess protein in the urine. |
| prothrombin |
a protein in blood plasma that combines with calcium during clotting to form thrombin. |
| ptomaine |
any of a variety of basic nitrogenous substances, some poisonous, that are produced by the decay of protein. |
| receptor |
in biochemistry, a protein that receives a chemical signal sent from another cell, and elicits a cellular response. [1/2 definitions] |
| rhodopsin |
the red, light-sensitive protein pigment that is present in the retina of the eye and provides vision in dim light. |
| ribosome |
any of various small particles in the cytoplasm of a cell that contain RNA and are active in protein synthesis. |
| RNA |
any of several single-stranded nucleic acids containing the sugar ribose that occur in the cytoplasm of all living cells and are essential in protein synthesis; ribonucleic acid. |
| serum albumin |
the main protein found in blood plasma, serving to regulate osmotic pressure. [2 definitions] |
| serum globulin |
a protein component of blood serum chiefly containing antibodies. |
| soybean |
the nutritious, protein-rich seed of this plant. [1/2 definitions] |
| tempeh |
an Indonesian food that is high in protein, made of fermented soybeans. |
| tofu |
a food product that is made from curdled soybean milk, has a bland flavor and the texture of a soft cheese, and is high in protein content; bean curd. |
| triticale |
a high-protein grain formed by crossing wheat and rye. |
| yolk |
the yellow nutritive substance in an egg, consisting of protein and fat, that is involved directly in the formation of the embryo. |
| zymogen |
an inactive protein that has the potential to become an enzyme because of an internal change. |