Carbon dioxide fixation
What will be an ideal response?
attaches CO2 to a 5-carbon molecule named RuBP by the enzyme RuBP carboxylase
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
Live-bearing reproduction, or viviparity, has apparently evolved
a. just three separate times. b. about 200 separate times in vertebrates alone. c. only in mammals. d. only once, although many groups lost it secondarily. e. about 15 separate times.
Which of the following metabolic pathways
uses ATP and NADPH that formed in the light-dependent reactions of photosynthesis?
a. the Calvin-Benson cycle b. the Krebs cycle c. glycolysis d. aerobic respiration e. the light-dependent reactions
Which of these biomes is one of the most biologically productive of all biomes?
A) open oceans B) estuaries C) temperate grasslands D) coniferous forests