You label CO2 with radiolabeled 18O. After exposure of a plant adapted to a hot, dry climate to the radiolabeled CO2, in what molecule does the radiolabeled 18O appear?
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You label CO2 with radiolabeled 18O. After exposure of a plant adapted to a hot, dry climate to the radiolabeled CO2, in what molecule does the radiolabeled 18O appear?
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- If a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur?An important factor for plants is the amount of water lost for each molecule of carbon dioxide absorbed. How could the plant be harmed if it loses a lot of water for each carbon dioxide molecule, that is, if the ratio is high? Would this be more important for a plant in a rainy habitat or one in a desert?If you were to label H2O with a traceable oxygen isotope (O18) and use this to water a grape vine, what metabolic product molecules would end up with the O18 and why? Similarly, what if you feed a plant CO2 labeled with O18, where would the labeled oxygen atoms end up?
- If a plant is removed from its natural environment and exposed to 100 percent CO2 composed of the radioisotope 14C, which of the following will not occur? Select one: a. The rate of photorespiration will remain unchanged. b. The sugars synthesized by the plant will be radioactive. c. The oxygen released will also be radioactive. d. All the carbon molecules in the RuBP molecules will eventually become 14C. e. Rubisco will eventually contain 14C.Which of the following statements is incorrect? a. Pigments absorb light of certain wavelengths only. b. Many accessory pigments are multipurpose molecules. c. Chlorophyll a is green because it absorbs green light.An important factor for plants is the amount of water lost for each molecule of carbon dioxide absorbed. How could he plant be harmed if it loses a lot of water for each carbon dioxide molecule, that is, if the ratio is too high?
- A plant that opens its stomata only at night is a container with a lit candle, the mouse would die. But if he also added a plant to the container, the mouse could live. Priestley concluded that plants “purify” air, allowing animals to breathe. What is the biological basis for this observation? a. C2 plant. c. C4 plant. b. C3 plant. d. CAM plantUnder what conditions do the wasteful side reaction of O2 with rubisco become significant? a.) at night when the sun goes down and photosynthesis is limitng b.) low temperatures and high moisture c.) higher levels of soluable CO2 than O2 d.) higher levels of soluable O2 than CO2 e.) higher levels of rubisco enzyme in the cytoplasmWhich of the following statements is true? Plants need only CO2 to survive Plants do not need oxygen at all. Plants need both O2 and CO2 to survive Plants neither need O2 and CO2 to survive
- Apple cider is used as the sugar in the process shown in the picture. What is the gas that is being collected in th balloon? A oxygen B)carbon dioxide nitrogen D) waterIf a leaf disc is exposed to light but not to CO2, why would it not produce enough O2 to float?Which of the following descriptions about C4 and CAM plants is not correct? Select one: a. CAM plants use CO2 released from organic compounds during the day b. C4 and CAM plants both close stomata during the day in hot and dry climates. c. in C4 plants, PEP carboxylase present in bundle-sheath cells incorporate CO2 into C4 compounds d. CAM plants fix CO2 at night e. C4 plants use PEP carboxylase to fix CO2 even when CO2 concentrations are low