photosymtheis and aerobic cellular respiration

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pavitra2009
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photosymtheis and aerobic cellular respiration

Both photosynthesis and aerobic cellular respiration are examples of complex metabolic pathways, consisting of many linked chemical reactions that require enzymes to function. but i need a brief describtion of  two (ONLY TWO) attributes of enzymes in catalyzing chemical reactions and in metabolic pathways... why i ask this because .. you people can think an apt of 2 important ..prominent..enzymes.
hello friends since we all know the common basic of cell photosynthesis and respiration .. i was in a path to identify a common mecahnism  path between the enzymes involved in these mechanism .. iam trying to link all the biologically catalysing enzymes involved in it under a single roof pathway .. so if anyone have an dynamic way  of thinking this question may help me out .

Ivan Delgado
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I am not sure if I follow what you are trying to achieve but I can give you two of the most important characteristics that in my mind make it all happen: 
1. There are two systems and the components (enzymes) are kept in close proximity thanks to the fact that almost all them are membrane bound (akin to an assembly line: the first step is catalyzed by the first enzyme, creating the substrate for the next one that is right next to it). 
2. The process has release valves, and shutdowns, to handle the inflow of raw materials. For example photosynthesis uses different pigments when too much light is coming in while respiration generates lactic acid when not enough oxygen is present to support its reactions.

pavitra2009
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Ivan wrote:

Ivan wrote:

 
I am not sure if I follow what you are trying to achieve but I can give you two of the most important characteristics that in my mind make it all happen: 
1. There are two systems and the components (enzymes) are kept in close proximity thanks to the fact that almost all them are membrane bound (akin to an assembly line: the first step is catalyzed by the first enzyme, creating the substrate for the next one that is right next to it). 
2. The process has release valves, and shutdowns, to handle the inflow of raw materials. For example photosynthesis uses different pigments when too much light is coming in while respiration generates lactic acid when not enough oxygen is present to support its reactions.

hai ivan thanks. but i need little more straight answer to my point . can u brief out the attributes of two important enzymes in catalyzing chemical reaction and in the metabolic pathways.... ( in consideration with photosynthesis and aerobic celluler respiration). thank u .

Ivan Delgado
Ivan Delgado's picture
 

 
Hmm, I am not sure I can do that. Let me take a stab at it: Lets take ATP synthetase. As I mentioned in my previous post it is a membrane bound enzyme that is capable of transporting protons through the membrane. This is only possible because the enzyme spans the membrane, thus enabling it to collect protons at one side of the membrane and let them cross to the other side. It is this transport of protons by ATP synthetase that generates ATP. Without this physical configuration and structure, ATP synthetase would not be able to do its job. 
Other than that I do not know what else I could tell you.
 
pavitra2009 wrote:

hai ivan thanks. but i need little more straight answer to my point . can u brief out the attributes of two important enzymes in catalyzing chemical reaction and in the metabolic pathways.... ( in consideration with photosynthesis and aerobic celluler respiration). thank u .
Spanky
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Two attributes of enzymes as

Two attributes of enzymes as both catalysts for chemical reactions and in the processes involved in metabolic processes are that enzymes are specific and that their activity is often regulated (Audesirk, Audesirk, Byers, 2008, p 109). Enzymes are specific because they typically only perform one function or functions in a chemical reaction. These enzymes can only react with a substrate that has a distinctive shape and charge. Once the reaction is complete, the enzyme must be reprocessed or recycled before it can again complete additional chemical reactions.
Another attribute of an enzyme is that its activity is regulated. Let’s say a specific enzyme has produced enough of one particular type of amino acid. If this enzyme has an allosteric regulatory site, further amino acid production will be halted as these acids will bind to enzymes regulatory site preventing any further production by the enzyme (Audesirk, Audesirk, Byers, 2008, p 111).

Audesirk, T. Audesirk, G. Byers, B.E. (2008). Biology Life on Earth with
Physiology. (8th ed.) Prentice Hall. Retrieved August 24, 2009, from
AIU Online, Virtual campus. SCI206- 0903B-01 website.