Chlorophyll b absorbs green wavelengths of light that chlorophyll a cannot absorb. In this respect, chlorophyll b acts as
A. an accessory pigment.
B. a more efficient pigment.
C. a light absorber in the green light.
D. an energizer for photosynthetic bacteria.
Answer: A
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The appearance of complex multicellular animals in the fossil record:
A. coincides with increased levels of oxygen in the atmosphere and ocean. B. occurred at about the same time as the appearance of land plants. C. occurred soon after the appearance of simple multicellular organisms. D. occurred after the appearance of complex multicellular fungi. E. coincides with time period when oxygen first began to accumulate in the atmosphere.
The largest bone in the body is the
a. femur. b. humerus. c. tibia. d. fibula. e. hipbone.
The nucleolus
A) is surrounded by a thin nucleolar membrane. B) is found in prokaryotes. C) contains tRNA. D) synthesizes ribosomal RNA. E) is found in prokaryotes and contains tRNA and rRNA.
Patients with legionellosis should be placed in isolation when hospitalized due to the contagious nature of the pathogen.
a. true b. false