Unformatted text preview: ts are mos tly c lus tered near the c enter of the c ell (bottom). Which of the following statem ents correctly describes which cell(s) would be wellsuited for Engelm ann’s experim ent? Assum e that
about three cells in the algal filam ent would cover the width of the visible spectrum on the m icroscope slide.
The bottom c ell s hould not be us ed bec aus e areas of the c ell with no c hloroplas ts c annot produc e ox y gen when illuminated by any
c olor of the v is ible s pec trum.
Either of the two c ells c ould be us ed bec aus e they are both c apable of abs orbing light and produc ing ox y gen in photos y nthes is .
Either of the two c ells c ould be us ed bec aus e they both c ontain the s ame number of c hloroplas ts . Hin t 3. Does the alga absorb the same amount of light at all wavelengths?
The graph below s hows the abs orption s pec tra of the three main ty pes of photos y nthetic pigments that c ontribute to light abs orption in the alga
that Engelmann us ed for his ex periments . Rec all that light mus t be abs orbed in order for its energy to be us able by the alga for photos y nthes is . Which of the following interpretations of this graph is correct?
ANSWER: se ssion.ma ste r ingbiology.c om/myc t/a ssignme ntPr intVie w? a ssignme ntI D= 2242937 9/41 13- 10- 13 Cha pte r 10
The greeny ellow wav elengths are abs orbed muc h more than the red and v ioletblue wav elengths .
All wav elengths of light are abs orbed equally by the alga.
The red and v ioletblue wav elengths are abs orbed muc h more than the greeny ellow wav elengths . Hin t 4. T he relationship between light absorption and photosynthesis
Some plants c ontain pigments that abs orb light but do not driv e photos y nthes is . The pres enc e of s uc h pigments appears as a peak in the
abs orption s pec trum without a c orres ponding peak in the ac tion s pec trum.
Compare the two graphs below.
One graph s hows an abs orption s pec trum for a nonphotos y nthetic pigment, anthoc y anin (blue line), as well as abs orption s pec tra
for the c hlorophy lls and...
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- Spring '14