Question

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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.

Answer 1

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

Answer:

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.

Answer:

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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Answer 2

There is great relationship between absorption of chlorophyll and wavelength.

There is direct relationship between chlorophyll absorption and wavelength because chlorophyll absorb the energy of certain wavelengths of light, that initiates the reactions of photosynthesis. The best wavelengths of visible light that is used by the plant during the process of photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm).

The photosynthetic organisms that live less than 25 feet below the surface of the ocean do not need phycoerythrin to survive because the green light does not needed by the plant for the process of photosynthesis. Only red and blue light is used for making food so phycoerythrin which is responsible for capturing green light is not needed by the plants for their survival so we can conclude that there is direct relationship between absorption of chlorophyll and wavelength.

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