BZ 440 MOD 6 EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026

BZ 440 MOD 6 EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026 Chloroplast - Answers Responsible for Photosynthesis Green due to high chlorophyll, but can have other pigments Thylakoid - Answers Where light rxn occurs Light RXN - Answers Pigment captures ligth energy H2O spilts and O2 evolved High energy e- from H2O to O2 used to produce ATP and NADPH Stroma - Answers Where Calvin Cycle occurs Aqueous fluid surrounding thylakoid Calvin Cycle - Answers CO2 is fixed using ATP and NADPH formed in light rxn Principal Pigments - Answers Drive photosynthetic electron transport Needed for photosythesis Ex: Chlorophyll a, bacteriochlorophyll Accessory Pigments - Answers Absorb photons and donate to principal Protect organism from excess light Xanthophylls - Answers Type of carotenoid pigments (accessory) Protects from photoinhibition Functions through xanthophyll cycle Uses excess light energy to produce heat Antenna complex/ light harvesting complex (LHC) - Answers Pigments molecules cooperate to harvest light energy Transfers light energy to RXN center complex Size, # pigment molecules, type of pigment depend on light quality RXN center complex - Answers Chlorophyll molecules that receive light from antenna complex Converts ligtht energy to chemical energy using oxidation-reduction rxns Organization of light absorbing pigments in antenna complex - Answers Highest excitation energy at top Ensures efficient transer of light energy to rxn center complex Some of energy transfered down released as heat, the rest of energy used in photosynthetic rxns Photosystem I (P700) - Answers Low energy (high redox potential) After PSII Absorbs far red light energy (680 nm) Strong reductant (NADP+ - NADPH) Photosystem II (P680) - Answers High energy (low redox potential) Operates first Absorbs red light Strong oxidative (H2O - H+ + O2) Z-Scheme - Answers Arrangment of PSII and PSI by redox potential Electron Transport Chain (ETC) - Answers Transports electrons from weak reductant (P680) to strong reductant (P700) Photophosphorylation/ Proton moving force (PMF) - Answers Formation of ATP non-cyclic photophosphorylation - Answers Identical to mitochondria Req: PSII, PSI, PQ, Cytb6f, PC, change in pH, NADP+, FD-NADP+-reductase, ADP, Pi Plastoquinone (PQ) - Answers Receives electron from PSII and shuttles to cytochrome b6-f complex Cytochrome b6-f complex - Answers A proton pump found in the thylakoid membrane. This complex uses energy from excited electrons to pump protons from the stroma into the thylakoid compartment. Plastocyanin (PC) - Answers Copper containing protein which acts at electron carrier from Cytb6f to PSI