Photosynthesis is responsible for producing >50% of Earth's oxygen. During photosynthesis inorganic __ is fixed into organic compounds like___ without the help of sunlight.

A. H2O, Oxygen
B. CO2, C6H12O6
C. H2O, C6H12O6
D. CO2, Oxygen
E. All of the choices are correct


Answer: B. CO2, C6H12O6

Biology & Microbiology

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Which of the following statements regarding the algal sister groups of land plants is not correct?

A. Their dispersal phase is in the water. B. They have diploid and haploid stages in their life cycle. C. Fertilization requires water. D. Their dominant, multicellular form is haploid. E. Their dispersal phase can be in the water or in the air.

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Which of the following could be considered an oligotrophic (growing at low nutrient levels) environment inhabited by alpha-proteobacteria?

A. Anaerobic environment B. Growth in food items C. Symbiotic growth D. Remote marine environments

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cDNA

a. does not contain introns. b. is produced from mRNA. c. production utilizes reverse transcriptase. d. begins as a hybrid molecule with an mRNA. e. fits all of these descriptions

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The G2 checkpoint prevents entry into _______ if _______.

a. G1; DNA synthesis is not complete and/or DNA is damaged b. S; DNA synthesis is not complete and/or DNA is damaged c. G2; DNA synthesis is not complete and/or DNA is damaged d. M; DNA synthesis is not complete and/or DNA is damaged

Biology & Microbiology