Ward's ap biology lab 4 plant pigments and photosynthesis answers
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AP Biology Lab 4: Plant Pigments and Photosynthesis
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Plant pigments and photosynthesis lab answers chapter 8
Yes, it's not an easy topic.
Visible light has wavelengths from 400nm (violet-blue) to 700nm (red), and chlorophyll can absorb at all these wavelengths (just not so efficiently at green wavelengths, which is why plants appear green). Other pigments used by photosynthetic organisms often absorb optimally at the wavelengths that chlorophyll is not so efficient at using, but they will also tend to have a broad spectrum.
Energy transfer through the antenna complex is not as simple as the transfer of photons, as you rightly suggest. Unfortunately, it is also not as simple as the transfer of electrons. It happens by a process called radiationless energy transfer, whereby an excited electron drops back to its ground state and the released energy is immediately absorbed by an electron in the next molecule, without any photon being emitted. Transfers are very fast (picoseconds) and the molecules have to be within a certain distance of each other (Wikipedia suggests less than 10nm).
I've only given a very brief overview so please re-post if you have more questions, and maybe some other people on this site will have more to add. However, this whole area is at the very borderline of biology and physics, so if you can find a site called 'askaphysicist', you might get a more thorough answer!
Mark the top of your bands and their origin
Chromatography is a good way to identify pigments and retention rates, but it may not be the best wayto measure photosynthesis.
Chromatography is a process where different compounds or pigments can be analyzed through separation.
Plant Pigments and Photosynthesis Lab - Prezi
Carotenoids are naturally occurring pigments produced in photosynthesizing plants, algae, bacteria and… aphids? These pigments are responsible for the varying coloration found in organisms on Earth. The most common being the orange carrot that owes its bright color to the carotenoid carotene. For pea aphids, carotenoids display green, a darker red/orange, or a yellowish/white color when environmental conditions aren’t as favorable as carotenoid synthesis is a taxing process.
Sequencing of the pea aphid’s genome has revealed insight into its many interesting biological features, such as how one genotype can produce winged and non-winged individuals by either sexual or asexual reproduction. The ability to capture energy from the sun was an unexpected addition to that list. The carotenoids form a thin layer underneath the skin of the back of the insect, positioning it perfectly to capture sunlight. True photosynthesis is not achieved, as the fixation of carbon dioxide to produce organic molecules does not occur. It is thought of as a more primitive form of photosynthesis. Research done by Jean Valmalette et al. (2012) found significantly higher levels of ATP (energy currency in organisms) in green colored aphids compared to orange. Pigments were extracted and absorbance tests revealed a striking difference between the level of absorbance of orange and green pigments, showing much higher levels of absorbance in green colored aphids.
PLANT PIGMENTS AND PHOTOSYNTHESIS ANSWERS
Plant Pigments And Photosynthesis Answers - …
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Plant pigments and photosynthesis answers - …
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