<P> Many bacteria , such as Escherichia coli found in the large intestine , can synthesize vitamin K ( menaquinone - 7 or MK - 7 , up to MK - 11 ) , but not vitamin K ( phylloquinone ) . In these bacteria , menaquinone transfers two electrons between two different small molecules , during oxygen - independent metabolic energy production processes ( anaerobic respiration ) . For example , a small molecule with an excess of electrons ( also called an electron donor ) such as lactate , formate , or NADH , with the help of an enzyme , passes two electrons to menaquinone . The menaquinone , with the help of another enzyme , then transfers these two electrons to a suitable oxidant , such fumarate or nitrate ( also called an electron acceptor ) . Adding two electrons to fumarate or nitrate converts the molecule to succinate or nitrite plus water , respectively . </P>
<P> Many bacteria , such as Escherichia coli found in the large intestine , can synthesize vitamin K ( menaquinone - 7 or MK - 7 , up to MK - 11 ) , but not vitamin K ( phylloquinone ) . In these bacteria , menaquinone transfers two electrons between two different small molecules , during oxygen - independent metabolic energy production processes ( anaerobic respiration ) . For example , a small molecule with an excess of electrons ( also called an electron donor ) such as lactate , formate , or NADH , with the help of an enzyme , passes two electrons to menaquinone . The menaquinone , with the help of another enzyme , then transfers these two electrons to a suitable oxidant , such fumarate or nitrate ( also called an electron acceptor ) . Adding two electrons to fumarate or nitrate converts the molecule to succinate or nitrite plus water , respectively . </P>
in large intestine vitamin k is formed by the activity of which bacteria
in large intestine vitamin k is formed by the activity of which bacteria
Many bacteria , such as Escherichia coli found in the large intestine
Many bacteria , such as Escherichia coli found in the large intestine