PLEASEEE HELP Phycobiliproteins are complex proteins in cyanobacteria that absorb light energy. There are three different kinds of phycobiliprotein molecules used to pass light to chlorophyll: phycoerythrin—responsible for capturing green light, phycocyanin—responsible for capturing orange-red light, and allophycocyanin—responsible for capturing red light.

Since light can only penetrate to certain depths in oceans, phycobiliproteins capture the light available and pass it through various pathways of phycobiliproteins until the emitted light is red, which is absorbed by chlorophyll. Use the figure below to answer the following questions.

1. Explain the relationship between chlorophyll absorption and wavelength.

2. Justify the claim that photosynthetic organisms that live less than 25 feet below the surface of the ocean do not need phycoerythrin to survive. Provide reasoning that explains this claim.

1.) Explain the relationship between chlorophyll absorption and wavelength.

As shown in detail in the absorption spectra, chlorophyll absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. Green light is not absorbed but reflected, making the plant appear green. Chlorophyll is found in the chloroplasts of plants.

2.) Justify the claim that photosynthetic organisms that live less than 25 feet below the surface of the ocean do not need phycoerythrin to survive. Provide reasoning that explains this claim.

The three most common organisms at the bottom of the Mariana Trench are xenophyophores, amphipods and small sea cucumbers (holothurians), Gallo said. The single-celled xenophyophores resemble giant amoebas, and they eat by surrounding and absorbing their food.

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