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What color is pheophytin?
Grey
What is the difference between chlorophyll and pheophytin?
Chlorophyll is a green pigment responsible for photosynthesis in plants, while pheophytin is a derivative of chlorophyll that lacks the magnesium ion found in chlorophyll. Pheophytin is formed when chlorophyll loses its magnesium ion, changing its color to olive-green or brown.
Why is pheophytin less polar than chlorophyll?
Pheophytin and Chlorophyll are similar in there makeup. The difference between the two is that the magnesium ion is replaced by hydrogen making it less polar.
What is the color of phaeophytin?
Pheophytin or phaeophytin (abbreviated Pheo) is a chemical compound that serves as the firstelectron carrier intermediate in the electron transfer pathway of photosystem II (PS II) inplants, and the photosynthetic reaction center (RC P870) found in purple bacteria. In both PS II and RC P870, light drives electrons from the reaction center through pheophytin, which then passes the electrons to a quinone (QA) in RC P870 and RC P680. The overall mechanisms, roles, and purposes of the pheophytin molecules in the two transport chains are analogous to each other.
What function of Pheophytin?
it is very similar to chlorophyll involved in making food for the plant but basically it gives a purplish or olive like color to green plant stuff,it is produced in veggies when over cooked or cooked when covers
What are the standard Rf values for pigments involved in photosynthesis?
The standard Rf values for pigments involved in photosynthesis are typically around 0.2-0.4 for chlorophyll a, 0.4-0.6 for chlorophyll b, and 0.8-0.9 for carotenoids. These values can vary slightly depending on the specific solvent system and chromatography conditions used.
What is the order of chlorophyll pigment bands from fastest to slowest?
Pigment colour Pigment Rf value orange yellow carotene 0.96 grey a breakdown product 0.70 blue green chlorophyll a 0.58 green chlorophyll b 0.48 deep yellow xanthophyll 0.44
What colour is tea?
Shade of colour in made tea and brightness in the infusion are two important attributes besides aroma and taste. Colour, the attractiveness of made tea, always influences consumers in deciding the product to be purchased. Unexpected colourmay possibly be a sign of poor quality tea. Colour and appearance are the consequent of clonal characteristics resulting from the technical manipulation during the manufacture of tea. Appearance is also a contributing factor in assessing the quality of tea. It was also indicated that there was a distinct relationship between the amount of theaflavins and thearubigins contents and mouth feel of liquor. Theaflavins and thearubigins appeared to be the key factors of golden yellow and brownness of the liquor respectively, while pheophytin and pheophorbide derived from chlorophylls contributed towards the blackish brown appearance
Why are these pigments unstable in the presence of light or heat energy?
Pigments can be unstable in the presence of light or heat energy because these forms of energy can break down the chemical structure of the pigments. This can lead to degradation or changes in color, reducing the pigments' effectiveness. Additionally, light and heat can promote chemical reactions that alter the pigments' properties.
How are electrons and protons used during the photosynthetic process?
(From Wikipedia; slightly paraphrased to make it easier to understand.) During the light-dependent stage of photosynthesis, one molecule of the pigment chlorophyll absorbs one photon (unit of light) and loses one electron. This electron is passed to a modified form of chlorophyll (called pheophytin), which passes the electron to a quinone molecule (another pigment), allowing the start of a flow of electrons down an "electron transport chain" that leads to the ultimate reduction of NADP+ to NADPH. In addition, this creates a "proton gradient" across the chloroplast membrane. Its dissipation is used at the same time by "ATP synthase" to make ATP from ADP. The chlorophyll molecule regains the lost electron from a water molecule through a process called photolysis, which releases an oxygen molecule (02).
How do you compare the different roles of photosystem 1 and photosystem 2 in photosynthesis?
The structure of photosystem I in a cyanobacterium ("blue-green alga") has been completely worked out. It probably closely resembles that of plants as well. It is a homotrimer with each subunit in the trimer containing: * 12 different protein molecules bound to * 96 molecules of chlorophyll a ** 2 molecules of the reaction center chlorophyll P700 ** 4 accessory molecules closely associated with them ** 90 molecules that serve as antenna pigments * 22 carotenoid molecules * 4 lipid molecules * 3 clusters of Fe4S4 * 2 phylloquinones Photosystem II is also a complex of * > 20 different protein molecules bound to * 50 or more chlorophyll a molecules ** 2 molecules of the reaction center chlorophyll P680 ** 2 accessory molecules close to them ** 2 molecules of pheophytin (chlorophyll without the Mg++) ** the remaining molecules of chlorophyll a serve as antenna pigments. * some half dozen carotenoid molecules. These also serve as antenna pigments. * 2 molecules of plastoquinoneSource: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/L/LightReactions.html
What is the difference beyween photosystem 1 and photosystem 2?
The structure of photosystem I in a cyanobacterium ("blue-green alga") has been completely worked out. It probably closely resembles that of plants as well. It is a homotrimer with each subunit in the trimer containing: * 12 different protein molecules bound to * 96 molecules of chlorophyll a ** 2 molecules of the reaction center chlorophyll P700 ** 4 accessory molecules closely associated with them ** 90 molecules that serve as antenna pigments * 22 carotenoid molecules * 4 lipid molecules * 3 clusters of Fe4S4 * 2 phylloquinones Photosystem II is also a complex of * > 20 different protein molecules bound to * 50 or more chlorophyll a molecules ** 2 molecules of the reaction center chlorophyll P680 ** 2 accessory molecules close to them ** 2 molecules of pheophytin (chlorophyll without the Mg++) ** the remaining molecules of chlorophyll a serve as antenna pigments. * some half dozen carotenoid molecules. These also serve as antenna pigments. * 2 molecules of plastoquinoneSource: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/L/LightReactions.html
