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UNC-Chapel Hill BIOL 101 - Guided Reading Q’s (Lesson 8)

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Guided Reading Q’s (Lesson 8)Photosynthesis1.Describe in words what happened in the light reaction of photosynthesis:The light reaction of photosynthesis is the first of 2 parts of photosynthesis: the steps in which solar energy is absorbed and converted to the chemical energy of ATP and NADPH, releasing oxygen in the process2.How is the Calvin Cycle linked to the light reaction?The second part of photosynthesis comes after the light reaction and it is called the Calvin Cycle.This is when a cyclic series of chemical reactions that occur in the stroma of a chloroplast, using the carbon in CO2 and the ATP and the NADPH produced by the light reactions to make the energy-rich sugar molecule G3P3.Examine figure 7.5B and describe it aloud. Try to then look away and replicate similar drawing here in pencil. Correct it until you have all of the inputs and outputs of both parts.4.What kind of visible light do plants NOT absorb well? Why do plants have various pigments in the chloroplast?Green light us not absorbed well however it is reflected. Which is why we see green. Chloroplast has more than one type of pigments, chlorophyll a/b, are some examples.5.Describe what light does in a photosystem by writing a detailed legend for fig 7.7B.Light in a photosystem transfers energy through pigment molecules with in the light harvesting complexes. Pigments molecules with the light energy goes through the reaction center and taken in by a primary electron acceptor6.Before looking at the details of electron transport and chemiosmosis of module 7.9, describe Figure 7.8—a mechanical analogy. A.) What is the big picture relative to electrons?The electrons in this mechanical analogy are taken through photosystems 1 and 2. Photons activate the electrons transportations, excelling them to higher levels of the photosystem. As the electrons travel on the chain from Photosystems 2 to 1 it loses energy, due to ATP gaining from it. Once the electron enters photosystem 1 another photon activates the electrons giving it energy to boost to the higher level, to them relinquish energy for NADPH.B.) Electrons flow from _________ ultimately to ___________, which is reduced to ___________.- Electron transport chain- NADP+ - NADPH 7.Just like in aerobic respiration the electrons lose small amounts of energy as they“bounce” from one electron carrier to the next. That released energy is used to do whatcellular work?Create ATP8.Similar to mitochondria during aerobic respiration, an H+ gradient is generated acrossmembranes (meaning there are more H+ on one side than the other). In thechloroplast, in what compartment do more H+ build up in? ______________________.These H+ then flow through what protein? ____________as they follow theirconcentration gradient (from high to low). What product of the light reaction has justbeen made as a result of the H+ gradient?- Thylakoid space- ATP synthase- ATP is created 9.Electrons in photosystem II would eventually be used up if not replaced. Water plays a rolein replacing electrons. A.) How?Water is splitB.) What part of the water molecule is used in the process and what part diffuses away?Oxygen is released while H+ ions are used in the process10.Let’s consider the last output: NADPH. After electrons bounce through the electrontransfer chain following photosystem II, they have lost considerable energy. They get re-excited at photosystem I and get passed to another electron transfer chain. A.) What is the terminal electron acceptor in this reaction?NADP+B.) What is it called once it is reduced?NADPHC.) Is it useful to the cell? Why?It helps to transport electrons11.The Calvin cycle takes place where in the chloroplast? _____________What is thechemical formula for glucose? _____________ So, how many carbons are in themolecule? ______ Therefore, how many carbon dioxide molecules will be needed fromthe atmosphere? _______- Stroma- C6H12O6- 6- 612.Taking carbon from the carbon dioxide in the air (called an inorganic molecule) andattaching the carbon to an organic molecule is called _______________. In thechloroplast, the name of the enzyme that performs this process is called _____________ - Carbon fixation- Rubisco*For the purpose of intro biology, we want to take away the major points of the Calvincycle:How many ATP total are needed to make one glucose? 18How many NADPH are needed to convert total to make one glucose? 12How can the chloroplast get more ATP and NADPH? From H2O in the thylakoid discs14.A.) How does photosynthesis remove carbon dioxide from the air?Stored in organic molecules (carbs)B.) What happens to carbon in the wood of a tree when it is burned?Combustion rapidly releases energy as heat and CO2*List things that increase CO2 in the atmosphere and things that remove CO2 from theatmosphere.Increase CO2Decrease CO2- Fossil fuels- Burning of wood15.What is the global consequence for the atmosphere is CO2 output by respiration exceedsits intake by photosynthesis and absorption into the ocean?Climate change and global warming16.What happens to the oceans as they absorb more and more CO2?CO2 dissolved in water equals carbonic acid, PH in ocean decreases affecting marine life andocean concentrations17. LabelA. Light energy D. O2 is released G. ATPB. Light reactions E. Electron transport chain H. G3P (sugar)C. Calvin cycle F.


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