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?
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.
- Spring '14