Photosynthesis: Chapter 10 Overview
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Questions and Answers

What is the primary function of Rubisco in phase 1 of photosynthesis?

  • Producing sugars directly from sunlight
  • Regenerating RuBP
  • Catalyzing the fixation of CO2 to RuBP (correct)
  • Breaking down G3P to release energy

What molecule is utilized for carbon reduction in phase 2 of photosynthesis?

  • 3-phosphoglyceric acid (G3P) (correct)
  • RuBP
  • O2
  • CO2

What is the consequence of Rubisco binding O2 instead of CO2 in photosynthesis?

  • Increased ATP synthesis
  • Stimulation of photorespiration (correct)
  • Reduced sugar production
  • Enhanced CO2 fixation

How does prolonged hot, dry conditions impact the process of photosynthesis in plants?

<p>Causes closure of stomata, hindering CO2 entry and O2 exit (C)</p> Signup and view all the answers

What environmental condition can cause plants to shift from photosynthesis to photorespiration?

<p>High oxygen concentration in the leaf (B)</p> Signup and view all the answers

In C4 plants, where does atmospheric CO2 fixation occur?

<p>Mesophyll cells (B)</p> Signup and view all the answers

How do CAM plants avoid photorespiration?

<p>By fixing CO2 via the C4 cycle and PEP carboxylase during the night (A)</p> Signup and view all the answers

What is the role of rubisco in C4 plants?

<p>Calvin cycle (B)</p> Signup and view all the answers

Which plant uses the C4 pathway to avoid photorespiration?

<p>C4 plants (B)</p> Signup and view all the answers

What is the primary function of PEP carboxylase in atmospheric CO2 fixation?

<p>Fixing CO2 in mesophyll cells (D)</p> Signup and view all the answers

Which organism incorporates chloroplasts into its own digestive tract cells after slurping them out of algal cells?

<p>Sea slug (Elysia chlorotica) (C)</p> Signup and view all the answers

What is the primary function of the light-independent reactions in photosynthesis?

<p>To make sugars using ATP and NADPH (B)</p> Signup and view all the answers

What is the role of photosystem II in the process of photosynthesis?

<p>Generate a proton-motive force for ATP synthesis (D)</p> Signup and view all the answers

What is the fate of excited electrons in photosynthetic pigments?

<p>Passed to an electron acceptor (A)</p> Signup and view all the answers

Which term best describes the arrangement of chlorophyll molecules into photosystems?

<p>Antenna complex assembly (A)</p> Signup and view all the answers

What is the main function of the 'antenna complex' in a photosystem?

<p>Absorb photons from sunlight (C)</p> Signup and view all the answers

How do Photosystem I and Photosystem II work together to maximize photosynthetic efficiency?

<p>Produce more ATP and NADPH for sugar synthesis (D)</p> Signup and view all the answers

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