In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the regions of Spirogyra algae that were bathed in red, blue, and violet light?

a. Chlorophyll is green and thus reflects green light.
b. The bacteria were immobile and that is where Engelmann happened to place them.
c. Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in
those regions.
d. Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in
those regions.
e. The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultra violet
and infrared).


ANSWER: d

Biology & Microbiology

You might also like to view...

Based on the data in the figure above, which of the following statements are correct?

I) Area 1 would be considered a desert because of its high average temperature. II) Area 1 has more average precipitation than Area 2. III) Area 2 would be considered a desert because of its low average precipitation. IV) Area 2 has a larger annual temperature variation. A) only I and III B) only II and IV C) only I, II, and IV D) only II, III, and IV E) only I, II, and III

Biology & Microbiology

Match the following items with the correct phrases.

_______1. Measles _______2. Viral hemorrhagic fever _______3. Chickenpox _______4. Smallpox _______5. Cold sores A) Ebola virus B) Herpes simplex virus C) Variola virus D) Varicella-zoster virus E) Rubeola virus

Biology & Microbiology

Which group of mammals lays eggs that have a leathery shell? a. Marsupials b. Placental c. All mammals lay eggs

d. None of the mammals lay eggs. e. Monotremes

Biology & Microbiology

Most scientific names are derived from

a. English. b. Latin. c. Italian. d. French.

Biology & Microbiology