Question

no explaination is needed

44) Halobacterium has a photosynthetic membrane that is colored purple. Its photosynthetic action spectrum is exactly complementary (opposite to the action spectrum for green plants. What wavelengths of light do the Halobacterium photosynthetic pigments absorb? A) blue, green, and red B) green and yellow C) red and green D) blue and red 45) Which of the following is not a typical feature of the cyanobacteria? A) Their photosynthetic pigments include chlorophylla and phytocyanin. B) Their cells do not contain nuclei or mitochondria. C) They are able to form 'blooms' under appropriate conditions. D) They have an obligate sexual life-cycle. 46) If photosynthesizing green algae are provided with CO2 synthesized with heavy oxygen (""), later analysis will show that all but one of the following compounds produced by the algae contain the "o label. That one is: A) 3-phosphoglycerate. B) glucose. C) ribulose bisphosphate (RuBP). D) O2 47) All algae are: A) unicellular. B) eukaryotic. C) symbionts. D) monophyletic 48) A biologist discovers an alga that is marine, multicellular, and lives at a depth reached only by blue light. This alga probably belongs to which group? A) red algae B) brown algae C) green algae D) golden algae

Answer 1

44) - B- Green and Yellow.

Since Halobacterium has a purple coloured membrane due to a pigment called bacteriorhodopsin, it absorbs the most in the wavelengths between 500-650 nm. Two major colours falling in this range are Green (520-560 nm) and Yellow(560-590), the former showing maximum absorbance spectra.Bacteriorhodopsin has an absorption spectra opposite to the action spectrum of green plants, which absorb in red and blue regions and almost completely reflect green colour.