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Unformatted text preview: t were mos t effec tiv e in driv ing the reac tions of photos y nthes is in green algae. A diagram of his apparatus is s hown below. Can y ou deduc e the logic al link between light of different wav elengths and the dis tribution of bac teria that Engelmann obs erv ed? Drag the labels onto the flowchart to show the relationship between the production of photons by the sun (Engelm ann’s light source) and se ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 6/41 13- 10- 13 Cha pte r 10 the distribution of bacteria that Engelm ann observed under his m icroscope. Not all labels will be used. Hin t 1. White light consists of many different colors (wavelengths) of light When a beam of white light from the s un or other light s ourc e is pas s ed through a pris m, the v arious c olors that mak e up white light are s eparated from eac h other, forming a c ontinuous v is ible s pec trum. On one end of the s pec trum is v iolet and blue light, with the s hortes t v is ible wav elength at about 400 nm. At the oppos ite end of the s pec trum is red light, with the longes t v is ible wav elength at about 700 nm. Note that one nanometer (nm) is equal to 10­9 meters . In his ex periment, Engelmann pas s ed s unlight through a pris m s o that he c ould ex pos e a filamentous alga to all the different wav elengths of the v is ible s pec trum. Hin t 2. What is the role of the alga in this experiment? Engelmann us ed a filamentous green alga in the genus Cladophora for his ex periment. What was the role of the algal cells in Engelm ann’s experim ent? Select the two that apply. ANSWER: The alga photos y nthes iz ed, produc ing s ugars that attrac ted the bac teria. Photos y nthetic pigments in the alga abs orbed s pec ific wav elengths of light. The alga photos y nthes iz ed, produc ing ox y gen that attrac ted the bac teria. The alga mov ed to the wav elengths where it c ould photos y nthes iz e the mos t. Hin t 3. What is the role of the bacteria in this experiment? One of Engelmann’s c ontributions to s c ienc e was the dis c ov ery of c hemotax is : the mov emen...
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This document was uploaded on 02/17/2014 for the course BIOCHEMIST 2550 at Ohio State.

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