Firs tengelmannus edapris mtodis pers

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Unformatted text preview: t of c ertain organis ms toward higher c onc entrations of a s pec ific c hemic al. He us ed thes e c hemic al­s eek ing bac teria in his ex periments on photos y nthes is . Which statem ent best describes the role of the bacteria in Engelm ann’s experim ent? ANSWER: The bac teria were attrac ted to ox y gen produc ed by photos y nthes is in the alga. The bac teria were attrac ted to s ugars produc ed by photos y nthes is in the alga. The bac teria were attrac ted to s pec ific wav elengths of light. The bac teria were attrac ted to s pec ific photos y nthetic pigments in the alga. ANSWER: se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 7/41 13- 10- 13 Cha pte r 10 Correct In this ex periment, Engelmann was able to determine whic h wav elengths (c olors ) of light are mos t effec tiv e at driv ing photos y nthes is . Firs t, Engelmann us ed a pris m to dis pers e white light from the s un into the c olors (wav elengths ) of the v is ible s pec trum. Then, us ing a mic ros c ope, he illuminated a filament of green algae with the v is ible s pec trum. The photos y nthetic pigments in the alga abs orbed s ome of the wav elengths of light, us ing the abs orbed energy to driv e the reac tions of photos y nthes is , inc luding ox y gen produc tion. Engelmann us ed his rec ently dis c ov ered aerotac tic bac teria to determine whic h wav elengths of light c aus ed the alga to photos y nthes iz e mos t. Bec aus e the aerotac tic bac teria were attrac ted to areas of highes t ox y gen c onc entration, they c ongregated around the regions of the alga that photos y nthes iz ed the mos t. He then c ounted the bac teria as s oc iated with eac h region of the alga illuminated by the v arious c olors of light. Engelmann found that s ome wav elengths of light attrac ted more bac teria, s ugges ting that thes e wav elengths driv e more photos y nthes is than others . Part B ­ Experimental results: Colors of light that drive photosynthesis Engelmann c ounted the number of bac teria that were attrac ted to the algal filament as s oc iated with eac h c olor of light...
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This document was uploaded on 02/17/2014 for the course BIOCHEMIST 2550 at Ohio State.

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