A mutation in a plant results in the loss of caretenoid production. What changes would you see in the range of wavelengths of maximum absorbance?
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- We perform our measurements for KHP at 281 nm. Would we get the same results for pathlength at 250 nm? What about using chlorophyll at 667 nm? Why might a too high concentration of KHP give erroneous data for measuring pathlength?THE LIGHT DEPENDEN REACTION MUST OCCUR BEFORE THE LIGHT INDEPENDENT REACTION TRUE OR FALSE?One of the most significant sources of thepollutants that contribute to photochemicalsmog is exhaust from automobiles. Hydrogencell cars run on hydrogen and electricityand emit only water. Do you think thatthe government should provide strongincentives, such as tax breaks, for peoplewho pay extra for these cars?
- Explain why the chlorophylls in light-harvesting complexes must absorb light of shorter wavelength than the light that would directly excite the special pair of PSI or PSII.Why do the reaction centers have different pigments rather than only the chlorophyls? quantitatively increasing the absorption photons narrowing coverage of the visible spectrum light increasing coverage of the visible spectrum light arranging light-harvesting complexe compensating for the high density of chlorophyllChlorophyll reflects green light (540–560 nm) and absorbs other wavelengths. What biologically important molecules other than chlorophyll absorb and reflect certain colors?
- How can the physical properties of chlorophyll be used in measuring primary productivity in ecosystems? Hint: Can chlorophyll’s near infrared reflection be captured by special cameras?compare and contrast the quantum yields of photochemistry and photosynthetic carbon fixation. Explain the differences between the respective quantum yield values.Based on the vein density results and your knowledge of how the light treatments would impact the light reactions of photosynthesis, how can you explain the high starch concentration and low photosynthetic capacity value in symplastic loader individuals grown in low light and transferred to high light for one week prior to the measurements? Figure Legend: Figure 1. Spinach is an apoplastic phloem loader, while pumpkin is a symplastic phloem loader. An experiment was performed where spinach and pumpkin individuals were grown under three conditions LL - in low light environment (grey bars) HL- in high light environment (white bars) LL->HL in low light environment and then transferred to a high light environment for one week prior to measurements (dark stripes bars) The following measurements were performed on individuals of the two species growing in the three different treatments: vein density, starch content in leaves, and photosynthetic capacity. Statistical tests were performed…
- discuss four factors that influence the respiratory deposition of bioaerosols.What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Wouldphotosynthesis be more efficient if their individual absorption spectra coincided exactly?What is the concentration of chlorophyll B if an absorbance of 1 is measured at 431nm in a cuvette with a pathlength of 1cm. (Chlorophyll B Extinction coefficient: 57.43 mM-1 cm-1)
