Fragmentation is a method of reproduction in the
A. flatworm.
B. earthworm.
C. roundworm.
D. sponge.
D. sponge.
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Regarding CO2 fixation mechanisms in the autotrophic green sulfur bacteria,
A) Chlorobium uses the reverse citric acid cycle, and Chloroflexus uses the hydroxypropionate pathway. B) Chlorobium uses the hydroxypropionate pathway, and Chloroflexus uses the reverse citric acid cycle. C) both Chlorobium and Chloroflexus use the reverse citric acid cycle. D) both Chlorobium and Chloroflexus use the hydroxypropionate pathway.
On which chromosome is the BRCA2 gene located?
A. 3 B. X C. Y D. 13 E. 17
One of the important effects of ethylene is
a. the breakdown of cells. b. cell elongation. c. cell division in meristems. d. activation of protein synthesis. e. inhibition of all of these processes
The exoskeleton of early marine arthropods can be considered a "pre-adaptation" for life on land because it
A) resisted water loss. B) absorbed light. C) protected against predators. D) reflected ultraviolet radiation.