Biochem Module 9 Exam Questions and Correct Answers Latest Update 2025

Biochem Module 9 Exam Questions and Correct Answers Latest Update 2025 where does photosynthesis take place - Answers chloroplasts mitochondria:matrx::chloroplast: - Answers stroma in the stroma are membranous discs called ____, which are stacked to form ____, which are linked together my ____. - Answers thylakoids, granum, stroma lamellae photosynthesis transforms _____ energy into _____ energy - Answers light, chemical the first event in photosynthesis is the trapping of light by a _____, This starts the process of energy transfer from one electron to another, known as _____ - Answers photoreceptor molecule resinance energy transfer an excited electron may move from to a nearby molecule that has a lower excited state in a process known as ____ or____. The electron now has ____ power. The pair of electron carriers at which the charge separation takes place are called the ____, and are located at the ____ - Answers electron transfer photo induced charge separation reducing special pair reaction center _____ is the primary light acceptor in most photosynthetic systems - Answers chlorophyll chlorophylls are effect photoreceptors because they contain networks double bonds known as - Answers polyenes chlorophyll a absorbs light at ____ and ___ nm chlorophyll b absorbs light at ____ and ____ nm - Answers 420, 670 470, 620 the absorption spectrum is expanded by the use of antennae molecules such as: ____, ____, and ____ - Answers chlorophyll a not in reaction center chlorophyll b other pigments like carotenoids _____ suppress damaging photochemical reactions involving oxygen - Answers carotenoids photosystem I responds to light wavelengths _____ and is responsible for ________ photosystem II responds to wavelengths ____, sending electrons through a membrane-bound proton pump called _____, and then on to _____ to ____ - Answers shorter than 700 nm providing electrons to reduce NADP+ to NADPH shorter than 680 cytochrome b6f PS I replace electrons the electrons in the reaction center of PS II are replaced by _____ - Answers oxidizing H2O electrons flow from ____, to ____, through ____, to ____, and are accepted by ____. This creates a ____ used to ____ - Answers water PSII cytochrome b6f PSI NADP+ proton gradient synthesize ATP PSI uses light energy to generate ____ - Answers reduced ferredoxin a special pair of chlorophyll a molecules lie at the core of PSI, and these are called ___ - Answers P700 when activated by light, electrons in P700* flow down an ETC through _____ and ____ to a set of ____, and then transferred to ____ - Answers chlorophyll A0 quinone A1 4Fe-4S clusters ferredoxin the currency of readily available biosynthetic reducing power in cells is _____ - Answers NADPH ferredoxin reduces NADP+ in a reaction catalyzed by ____ - Answers ferredoxin-NADP+ reductase the reduction of NADP+ takes place _____ this makes the stroma more ____ than the thylakoid lumen, creating ______ - Answers stromal side of thylakoid membrane basic proton motive force the pair of chlorophyll molecules in the reaction center of PSII is known as ____ - Answers P680 electrons in PSII are transferred from P680* to ____, to ____, to____, which is reduced to ___ the uptake of protons from the stroma increases the ___ - Answers pheophytin Ph plastoquinone Qa platoquinone Qb QH2 proton motive force to get from PSII to PSI, electrons are transferred from ___ to __, catalyzed by ____ this serves to increase the ____ - Answers QH2 plastocyanin Pc cytochrome b6f proton motive force the electron deficient P680* is a very strong ____ and is capable of extracting electrons from ____, resulting in the release of ____ this takes place at the ____, also called the ____ - Answers oxidant water oxygen water oxidizing center (WOC), manganese center the special pair in P680* takes electrons from a ____, which removes electrons from ____. This process occurs ____ times, with __ molecules of water to produce __ molecules of O2 - Answers tyrosine, manganese 4, 2, 1 enzyme that catalyzes ATP synthesis in chloroplasts: ___ or ___ ___ conducts protons across the membrane ___ synthesizes ATP from ADP and P - Answers ATP synthase CF1-CF1 complex F0 F1 during ATP synthesis, ____ and ____ are released into the stroma - Answers ATP, NADPH for maximal activity, a disulfide bond in the gamma subunit of ATP synthase must be reduced. this is accomplished by ___, made from ____ the conformation of e subunit is determined by ___ - Answers thioredoxin, ferredoxin proton motive force if the ratio of NADPH to NADP+ is high, electrons can flow cyclically and be used to synthesis ___ in a process known as ____ - Answers ATP, cyclic phosphorylation true of false: PSII participates in cyclic phosphorylation - Answers false the absorption of ____ photons yields _ O2, __ NADPH, and __ ATP - Answers 8, 1, 2, 3 PSI and ATP synthase are located in ____ regions and PSII is located in ____ regions (stacked or unstacked) - Answers unstacked stacked herbicides work by _____ - Answers inhibiting PSI and/or PSII