Thec orrec tedac tions pec trumwoulds howhigherpeak s

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Unformatted text preview: ed at thos e wav elengths ? How would that affec t the number of aerotac tic bac teria attrac ted to thos e parts of the alga? Finally , how would that affec t the ac tion s pec trum? Hin t 2. How does light intensity (number of photons) affect the amount of oxygen produced? Engelmann’s ex periment demons trated that red light is effec tiv e at driv ing photos y nthes is , and thus ox y gen produc tion, in the alga he s tudied. Now s uppos e Engelmann did an ex periment in whic h he illuminated an algal c ell with red light for 3 minutes and c ounted the number of bac teria that aggregated near the c ell. Nex t, he repeated the ex periment but doubled the intens ity of the red light, i.e., he doubled the number of red photons hitting the c ell. Predict how the num ber of bacteria aggregating near the cell would change from the first experim ent to the second. ANSWER: The number of bac teria aggregating near the c ell would inc reas e after doubling the intens ity of the red light. The number of bac teria aggregating near the c ell would remain the s ame after doubling the intens ity of the red light. The number of bac teria aggregating near the c ell would dec reas e after doubling the intens ity of the red light. ANSWER: se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 11/41 13- 10- 13 Cha pte r 10 Correct An ac tion s pec trum is ty pic ally plotted s o that the “ac tion” s hown on the y ­ax is is meas ured with an equal number of photons at eac h wav elength of the v is ible s pec trum. But our s un does not emit equal numbers of photons at eac h wav elength. Ins tead, the s un emits the mos t photons in the y ellow part of the s pec trum, with relativ ely fewer photons emitted in the red and v iolet­blue parts of the s pec trum. Thus , the red and v iolet­blue regions of Engelmann’s ac tion s pec trum were meas ured with fewer photons than in the y ellow part of the s pec trum. To c orrec t for this , y ou hav e to c ons ider how inc reas ing the number of photons in the red and v...
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