Stroma Biology Quiz

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 SBMPTN 2018 BIOLOGY 

9. The stroma in chloroplasts contains... (A) fat and starch (B) starch and protein ✔ (C) protein and fat (D) amino acids and glycerol (E) fatty acids and amino acids 

Answer 

Photosynthesis --> CO2 + H2O --> C6H12O6 Photosynthesis has 2 stages: --> light reaction, product: NADPH ATP, is a reducing agent --> dark reaction, product: sugar from CO2, requires a reducing agent grana = stacks of thylakoids Light reaction = photolysis = the breakdown of water by light = occurs in the thylakoids Light energy is captured by photosystem 1 and photosystem 2 in each thylakoid. Light energy is used to break down water --> H2O --> H+ + O2 + e-, O2 waste is removed, and H+ and e- are used for ATP Synthase (ATP and NADPH formation) ATP and NADH are used in the Calvin cycle in the stroma. Makes sugar by binding CO2 with the enzyme Rubisco to produce sugar (triglyceride phosphate/G3P). G3P is combined into complex sugars. This means that the stroma contains G3P, complex sugars (starch), ATP, NADPH, CO2, and rubisco (protein).


 SBMPTN 2015 BIOLOGY 

8. The following statements are true regarding glucose synthesis, except... A. occurs in the dark reactions in the stroma ✔ B. occurs in the light reactions in the thylakoid X C. occurs in the Calvin cycle ✔ D. requires energy in the form of ATP and NADPH ✔ E. forms organic molecules from CO2 ✔ Answer dark reactions in the stroma light reactions form ATP and NADP, which are used as energy in the dark reactions to produce glucose (Calvin cycle) thylakoid = grana membrane

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