Wednesday, February 10, 2010

A cell must produce large quantities of each enzyme in order to survive. True or False?

Got this quest. wrong on a test. Where/ how are enzymes produced?A cell must produce large quantities of each enzyme in order to survive. True or False?
The vast majority of biological enzymes (i.e. those produced in a living cell) are proteins. (Some are RNA molecules as well, but this is a very small minority.) Like all proteins, they are manufactured via the classical DNA -%26gt; RNA -%26gt; protein pathway, by way of transcription of a genetic sequence into RNA and translation of the RNA codons into protein in the ribosomes. The only difference between enzymes and what you might think of as 'regular', structural or otherwise proteins is that enzymes act as catalysts for some chemical reaction within the cell, and non-enzymatic proteins don't.





It is important to remember that there is an astounding range of biological enzymes. In other words, some enzymes are very commonly used in most places in your body (think about an enzyme needed to help you metabolize sugar or other basic nutrients). Other enzymes are produced in minute amounts or ONLY in specific situations (such as extreme stress or temperature), where they serve a specific function; in which case it would actually be bad to produce this enzyme in large quantities on a regular basis (for example, an enzyme that induces cell death, apoptosis). Therefore, each particular enzyme has a different turnover rate, meaning the transcription and translation mechanisms required to produce that protein are custom-regulated.A cell must produce large quantities of each enzyme in order to survive. True or False?
false....enzymes wil b produced in required amt...whenever the cell needs it...they are produced in specific sites....
A cell produces the types of enzymes need in sufficient quantity - some large some very small.

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