What level of productivity would one predict with high levels of water supply but low temperatures?
A) very low
B) low
C) high
D) very high
B
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For multicellularity to develop, there must be a mechanism of communication among cells in the multicellular organism. Which of the following structures present in the cell membrane receives signals from the environment?
A. plasmodesmata B. receptors C. gap junctions D. cadherins
The half-life of carbon-14 is approximately 5,700 years. How much of an initial 1.0 gram sample of carbon-14 will remain after 11,400 years (two half-lives)?
a. 0.33 grams (33%) b. 0.5 grams (50%) c. 0.25 grams (25%) d. 0.12.5 grams (12.5%)
Which of the following provides support for the endosymbiotic theory?
A. Mitochondria and chloroplasts have only a single membrane surrounding them. B. Mitochondria and chloroplasts contain genes that are vastly different compared to bacterial genes. C. Mitochondria and chloroplasts have their own genomes. D. Mitochondria and chloroplasts cannot synthesize proteins. E. Mitochondria and chloroplasts contribute to similar metabolic processes in the eukaryotic cell.
What is one difference between the energy produced from the light bulb and the energy produced during the process of bioluminescent light production?
a. Less than 5% of the energy converted is lost as chemical energy during the process of bioluminescent light production. b. Less than 5% of the energy converted is lost as heat energy during the process of bioluminescent light production. c. The conversion of heat energy produced during the process of bioluminescent light production is very inefficient. d. The conversion of chemical energy produced during the process