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en.wikipedia.org/wiki/Magnesium_in_biology

Magnesium is an essential element in biological systems. Magnesium occurs typically as the ... Over 300 enzymes require the presence of magnesium ions for their catalytic action, ..... Essential role in the biological activity of ATP[edit] ..... The entry of Mg2+ into cells may occur through one of two pathways, via channels ...

www.answers.com/Q/Two_essential_roles_that_enzymes_play_in_cells

Enzymes are biological catalysts that speed up chemical reactions that occur in everyday processes in a cell, such as cellular respiration.

www.answers.com/Q/Name_two_essential_roles_that_enzymes_play_in_cells

Blood carries oxygen from the lungs to the rest of the body. To do this blood cells have a specialized protein that is able to bind oxygen to the blood cell.

www.answers.com/Q/What_roles_do_enzymes_play_in_cells

they help cells digest food and extract energy from food.(awesome right !)hehe :P .

www.reference.com/science/two-essential-roles-enzymes-play-cells-94e00d8f31600249

Two specific roles that enzymes play in cells include being used as ion pumps during active transport, such as the ATPases, and being utilized as receptors for ...

www.jiskha.com/display.cgi?id=1194406399

Nov 6, 2007 ... ... something else (fructose=substrate ; fructase=enzyme ; -ase indicates an enzyme) ... Biology - What are two roles restriction enzymes play in ...

www.ncbi.nlm.nih.gov/books/NBK9921

Cells contain thousands of different enzymes, and their activities determine ... Like all other catalysts, enzymes are characterized by two fundamental properties . .... at the active site (Ser-195, His-57, and Asp-102) play critical roles in catalysis .

sciencing.com/role-enzymes-cellular-respiration-5466091.html

Cellular respiration is the process by which cells convert glucose (a sugar) into carbon dioxide ... The main role of enzymes during the respiration reaction is to assist in ... In the process glucose is “split” into two molecules of pyruvate, which continue the reaction. ... What Are the Reactants of the Electron Transport Chain?

sciencing.com/description-basic-functions-enzymes-cells-9763.html

Enzymes are proteins that do the everyday work within a cell. Their basic function is to speed up the process and efficiency of a reaction without themselves ...

discoverykids.com/articles/what-do-the-enzymes-inside-a-cell-do

Enzymes are what make all the chemical reactions in the cell possible. The human body is made up of trillions of cells, and there are different cells for different ...