Solve general biology 1 - Essay Example

Current Location Take Test: Homework #5 Photosynthesis & Cellular Communication Content Top of Form Assistive Technology Tips [opens in new window]InstructionsDescription Homework #5 Photosynthesis & Cellular Communication is due by this Sunday night, October 21, at 10:00pm. Login to Blackboard to complete the assignment anytime between now and then, and once you are finished push Save and Submit.  InstructionsMultiple AttemptsNot allowed. This Test can only be taken once. Force CompletionThis Test can be saved and resumed later.

Question Completion Status: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Question 1    The primary source of energy for most organisms is ultimately derived from   Answer A. glucose B. plants C. glycogen D. the sun E. catabolism 2 points   Question 2    These organisms most specifically utilize light energy to make organic molecules from inorganic molecules.   Answer A. photoautotrophs B. photoheterotrophsC. photoisotrophsD. photohemitrophsE. heterotrophs3 points   Question 3    The main structure for gas exchange in plants is called the   Answer A.

 mesophyll  B. chloroplast C. grana D. stomata E.2 points   Question 4    Which of the following statements would be most INCORRECT if there were a sudden decline in plants on Earth?   Answer A. oxygen levels in the environment might decline B. the rate of photosynthesis in existing plants would decline C. there would be less organic matter on Earth  D.a decline in the populations of herbivores would likely occur E. heterotrophic organisms would be significantly impacted 2 points   Question 5    Which of the following is NOT a product of the light reaction? Answer a. NADPH b.

energy intermediates c. Adenosine triphosphate d.oxygen e. carbon dioxide 2 points   Question 6    Which of the following statements about chlorophyll is correct?   Answer A. It appears green because it absorbs light in the green light spectrum. B. It reflects all colors in the light spectrum except green.  C. It reflects light in the green light spectrum.  D. It reflects high-energy electrons. E. All of the choices are correct. 2 points   Question 7    Which of the following is mismatched with its location? Answer A. light reaction; granaB.

 electron transport; thylakoid lipid bilayerC. Calvin cycle; stromaD. ATP synthase; intermembrane spaceE. splitting of water; thylakoid lumen2 points   Question 8    Which of the following is FALSE when comparing the mitochondria and chloroplast?   Answer A. Both have similar electron transport protein complexes. B. Both contain ATP synthase.  C. Both generate ATP via a H+ electrochemical gradient.   D. The inner-membrane space of the mitochondria is similar to that of the thylakoid lumen insofar as each has a higher H+ concentration relative to that of the mitochondrial matrix and chloroplast stroma.  E. The stroma of chloroplasts is similar to that of the mitochondrial inner-membrane space insofar as each has a higher H+ concentration relative to that of the chloroplast thylakoid lumen and the mitochondrial matrix.

  2 points   Question 9    During noncyclic electron flow of the light reaction, which molecule is the final acceptor of the high-energy electron?   Answer A. water B. P700 C. NADP+ D. P680 E.oxygen 2 points   Question 10    During photosynthesis, the energy given up by electrons as they move through the electron transport chain is used to   Answer A. produce glucose B. fix CO2.  C. generate an electrochemical H+ gradient across a membrane.  D. oxidize water E. boost energy levels of pigment electrons.

  2 points   Question 11    Which of the following represents a reactant or input for the light reaction of photosynthesis?   Answer A. carbon dioxide B. H2O C. oxygenD. ATPE. NADPH2 points   Question 12    What is the main role of the pigment molecules within the antenna or light-harvesting complex?   Answer A. Oxidize water and release oxygen to the reaction center chlorophyll.  B. Absorb photons and transfer light energy to the reaction center chlorophyll.     C. Synthesize NADPH.  D. Pass electrons to the electron transport chain and then to NADPH.  E. Increase H+ concentration in the stroma.

  2 points   Question 13    The Calvin cycle is only capable of fixing carbon dioxide in the dark.  Answer True False 2 points   Question 14    Which order of events for the Calvin cycle is correct?  I. ReductionII. Regeneration of the CO2 acceptor (RuBP)III. Carbon fixation  Answer A. I, II, III  B. III, II, I  C. III, I, II  D. I, III, II 2 points   Question 15    This molecule combines with CO2 to form the 3-carbon substance, 3-phosphoglycerate.   Answer A. glyceraldehyde-3-phosphate (G3P)  B.

 glucose  C. ribulose biphoshpate (RuBP)  D. glycerol E. nicotinamide adenine dinucleotide phosphate (NADPH) 2 points   Question 16    Which of the following has the highest photosynthetic efficiency in hot and dry environments?   Answer A. C3 plants  B. C4 plants  C. plants undergoing photorespiration  D. plants that use oxygen to produce sugars  E. plants that only produce sugar in the dark  2 points   Question 17    CAM plants have temporal adaptations which allow the fixation of carbon dioxide through stomata only during the night, while C4 plants exhibit morphological adaptations and can keep stomata partially open during the day even under hot and dry temperatures, storing the fixed carbon in specialized cells.

Answer True False 1 points   Question 18    ________ is the process through which cells can detect and respond to signals in their extracellular environment.   Answer  Reception  Transduction   Cell communication   Sensory response  2 points   Question 19    A substrate binds an enzyme as a signal molecule binds a   Answer A. second messenger. B. kinase.  C. transcriptional factor.   D. receptor.    2 points   Question 20    Hormones regardless of whether they operate locally or at long distances must bind a receptor to elicit a cell response.

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