I. Overview of photosynthesis L06: Photosynthesis & Respiration - - PDF document

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I. Overview of photosynthesis L06: Photosynthesis & Respiration - - PDF document

Oct 21, 2023 104 likes •183 views

2/3/20 I. Overview of photosynthesis L06: Photosynthesis & Respiration BIOL 153/L Black Hills State Univ. Ramseys A. Chemical formula B. Chloroplast CO 2 + H 2 O + Energy => C 6 H 12 O 6 + O 2 input output See

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L06: Photosynthesis & Respiration

BIOL 153/L Black Hills State Univ. Ramseys

  • I. Overview of photosynthesis
  • A. Chemical formula

CO2 + H2O + Energy => C6H12O6 + O2

input

  • utput
  • B. Chloroplast

See lecture 'Chloroplast Origins'

  • 1. Pigments

chlorophyll + carotenoids

  • 2. Membranes

inner/outer + thylakoid membranes

  • 3. Electrons

photosystem ETS

  • 4. Chemical bonds

carbohydrates assembled

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  • C. Action spectrum
  • 1. Types of electromagnetic radiation
  • 1. Types of electromagnetic radiation
  • 2. Wavelengths used by plants

blue light: ~400 - 500 nm red light: ~600 - 700 nm

  • 2. Wavelengths used by plants

why are plants green?

  • D. Biochemical pathways
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  • 1. Light reactions

light energy converted to ATP + NADPH

  • 2. Dark Reactions

ATP + NADPH assembles carbohydrates

  • II. Overview of respiration
  • A. Chemical formula

C6H12O6 + O2 => CO2 + H2O + Energy

input

  • utput
  • B. Mitochondria

See lecture 'Origin of Chloroplasts'

  • 1. Membranes

inner/outer membranes (cristae)

  • 2. Electrons

respiration ETS

  • 3. Chemical bonds

Carbohydrates disassembled

See lecture 'Origin of Chloroplasts'

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  • C. Biochemical pathways
  • 1. Aerobic (high ATP yield)

Glycolysis => Respiration

(cytosol) (mitochondria)

  • 2. Anaerobic (low ATP yield)

Glycolysis => Fermentation

(cytosol) (cytosol)

  • III. P&R as opposing biochem forces
  • uput of photosynthesis = input for respiration

(and vice versa)

  • Fig. 6-5

Raven p. 95

  • IV. Measurement of P&R

super insightful!

  • rganic molecules made (P)

minus

  • rganic molecules burned (R)
  • Option #1: Biomass

terrestrial: straightforward aquatic: straightforward

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  • Option #2: Gas exchange

O2 produced (P)

  • r

CO2 produced (R)

terrestrial: challenging aquatic: straightforward

leaf disk water column

Leaf disk assay Scenario #1: P > R

  • more O2 made vs. consumed
  • O2 accumulates in leaf
  • bouyant bubbles
  • leaf floats

Scenario #2: R > P

  • more O2 consumed vs. made
  • O2 disappears in leaf
  • no bouyount bubbles
  • leaf drops
  • V. Terrestrial consequences of P&R

photosynthetic organisms transformed earth (geological time)

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  • VI. Aquatic consequences of P&R

photosynthetic organisms transform water bodies (daily + seasonally)

Waves (lake surface)

  • A. Sources of oxygen
  • Atmosphere
  • Small photosynthetic plankton: P
  • Large photosynthetic plants: P
  • B. Sources of carbon dioxide
  • Decomposition
  • Heterotrophic organisms: R
  • Photosynthetic organisms: R
  • C. Changes through day

Summer (Day) Summer (Night)

Wind Waves (lake surface) Phyto- plankton Wind Waves (lake surface)

Summer (Day) Summer (Night)

Wind Waves (lake surface) Phyto- plankton

High O2

Wind Waves (lake surface)

High CO2

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  • D. Changes through seasons

Summer (Day) Winter (Day)

Wind Waves (lake surface) Ice Snow Phyto- plankton

Summer (Day) Winter (Day)

Wind Waves (lake surface) Ice Snow Phyto- plankton

High O2 Low O2 Min O2