Chloroplasts Knowledge-Based Download PDF

Questions

1. 1.

   Which enzyme, abundant in the stroma of chloroplasts, catalyzes the fixation of carbon dioxide to ribulose 1,5-bisphosphate during photosynthesis?

   • A) Carbonic anhydrase
   • B) ATP synthase
   • C) Phosphoenolpyruvate (PEP) carboxylase
   • D) Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO)
2. 2.

   Within the internal structure of a chloroplast, flattened thylakoid discs are organized into dense, column-like stacks. What biological term designates these stacks of thylakoids?

   • A) Cristae
   • B) Stroma lamellae
   • C) Cisternae
   • D) Grana
3. 3.

   Which feature of chloroplasts provides key evidence supporting the endosymbiotic theory of organelle origin?

   • A) Organization of internal thylakoids into dense stacks called grana
   • B) Ability to synthesize complex carbohydrates using light energy
   • C) Presence of chlorophyll pigments embedded within lipid membranes
   • D) Possession of circular DNA molecules and bacterial-like ribosomes
4. 4.

   Which component of the chloroplast consists of a dense, enzyme-rich fluid where the Calvin cycle takes place and carbon dioxide is converted into sugars?

   • A) Stroma
   • B) Thylakoid lumen
   • C) Intermembrane space
   • D) Outer membrane
5. 5.

   Which internal compartment of the chloroplast contains chlorophyll pigments and serves as the primary site for the light-dependent reactions of photosynthesis?

   • A) Thylakoid membrane
   • B) Stroma
   • C) Inner membrane
   • D) Intermembrane space