Chlorophyll and bacteriochlorophyll pigment molecules absorb light energy for photosynthesis. Each specific version of these mol
ecules absorbs a different range of wavelengths of light, allowing different species of phototrophs to coexist by partitioning their use of the light spectrum. What controls the absorption spectrum of each particular chlorophyll/bacteriochlorophyll? a. The specific metal ion in the center of the tetrapyrrole ring alters the absorption spectrum.
b. The number of tetrapyrrole rings linked together alters the absorption spectrum.
c. The exact orientation of the pigment molecule in the membrane (on the membrane surface, inner membrane or transmembrane) alters the absorption spectrum.
d. The various substituents on the tetrapyrrole ring alter the absorption properties of the pigments.
The correct answer is option d. "The various substituents on the tetrapyrrole ring alter the absorption properties of the pigments".
Explanation:
In chlorophyll and bacteriochlorophyll pigment molecules absorb light energy for photosynthesis at different spectrums. The means at which absorption spectrum is controlled is by the fact that the various substituents on the tetrapyrrole ring alter the absorption properties of the pigments. The tetrapyrrole ring has a a magnesium atom at its center, which in conjuction acts as an antenna for light's absorption.
The story of spontaneous generation illustrates that science is capable of doing exactly what it is supposed to do: observe nature and eliminate theories that contradict observations. In this case, the theory that (for instance) flies form spontaneously out of decaying meat was successfully falsified.
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