When ________ is blocked, some algae and cyanobacteria can carry out anoxygenic photosynthesis using compounds other than ________ as an electron source
a. PSI / H2
b. PSI / water
c. PSII / H2
d. PSII / water
Answer: D
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Alternation of generations means
A. One phase of the life cycle takes place on land and the other in water. B. One phase of the life cycle is photosynthetic and the other is heterotrophic. C. One phase of the life cycle is diploid and the other is haploid. D. One phase of the life cycle is unicellular and the other is multicellular. E. One phase of the life cycle is motile and the other is stationary.
All of the following are respiratory structures associated with the exchange of gases EXCEPT
a. the tracheal system. b. lungs. c. gills. d. villi.
Paleontologists have found fossils dating back 3.6 billion years. These closely resemble
a. nothing alive today. b. blue-green algae present today. c. small invertebrate animals. d. today's simplest plants. e. fungi.
Birds and reptiles save water by eliminating __________ rich wastes as uric acid crystals. Fill in the blank(s) with the appropriate word(s)