BIO110 Chapter 10 MasteringBiology Homework

Part B - Inputs and outputs of the Calvin cycle From the following choices, identify those that are the inputs and outputs of the Calvin cycle. Drag each item to the appropriate bin. If the item is not an input to or an output from the Calvin cycle, drag it to the "not input or output" bin.

- input: ATP, NADPH, CO2 - output: ADP, NADP+, G3P - not input or output: light, glucose, O2

Part A - Inputs and outputs of the light reactions From the following choices, identify those that are the inputs and outputs of the light reactions. (Recall that inputs to chemical reactions are modified over the course of the reaction as they are converted into products. In other words, if something is required for a reaction to occur, and it does not remain in its original form when the reaction is complete, it is an input.) Drag each item to the appropriate bin. If the item is not an input to or an output from the light reactions, drag it to the "not input or output" bin.

- input: light, water, NADP+, ADP - output: O2, ATP, NADPH - not input or output: glucose, CO2,G3P

Part C - Redox reactions of photosynthesis In photosynthesis, a redox compound that is produced in the light reactions is required to drive other redox reactions in the Calvin cycle, as shown in this figure along with other components of photosynthesis. Drag the terms to the appropriate blanks to complete the following sentences summarizing the redox reactions of photosynthesis. Terms may be used once, more than once, or not at all

1. In the light reactions, light energy is used to oxidize H2O to O2. 2. The electrons derived from this oxidation reaction in the light reactions are used to reduce NADP+ to NADPH. 3. The Calvin cycle oxidizes the light-reactions product NADPH to NADP+. 4. The electrons derived from this oxidation reaction in the Calvin cycle are used to reduce CO2 to G3P.

Part A Which of these equations best summarizes photosynthesis? H2O → 2 H+ + 1/2 O2 + 2e- C6H12O6 + 6 O2 → 6 CO2 + 12 H2O 6 CO2 + 6 H2O → C6H12O6 + 6 O2 6 CO2 + 6 O2 → C6H12O6 + 6 H2O C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy

6 CO2 + 6 H2O → C6H12O6 + 6 O2

Part B True or false? The chemiosmotic hypothesis states that the synthesis of ATP generates a proton gradient that leads to electron flow through an electron transport chain.

False

Part E True or false? The region of ATP synthase that catalyzes the production of ATP from ADP and inorganic phosphate spans the chloroplast membrane.

False

Part A Which process produces oxygen? Photosynthesis Cellular respiration

Photosynthesis

Part D Which of the following particles can pass through the ATP synthase channel? Inorganic phosphate ATP ADP Protons

Protons

Part H Which of the following reactions ensures that the Calvin cycle can make a continuous supply of glucose? Carbon fixation Production of 3-phosphoglycerate Production of G3P Regneration of RuBP

Regneration of RuBP

Part B Which set of reactions uses H2O and produces O2? The light-independent reactions The light-dependent reactions

The light-dependent reactions

Part F What is the biological significance of the light-independent reactions of photosynthesis? They make oxygen. They convert carbon dioxide to sugar. They convert ATP to sugar. They generate ATP and NADPH.

They convert carbon dioxide to sugar.

Part D True or false? The light-dependent reactions of photosynthesis use water and produce oxygen.

True

Part C The light reactions of photosynthesis use _____ and produce _____. NADPH ... NADP+ NADPH ... oxygen water ... NADPH carbon dioxide ... oxygen carbon dioxide ... sugar

water ... NADPH