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The Science of Everything Podcast

Episode 102: Photosynthesis Part II

The Science of Everything Podcast

James Fodor

Natural Sciences, Science, Social Sciences

4.8750 Ratings

🗓️ 11 March 2020

⏱️ 40 minutes

🧾️ Download transcript

Summary

Continuing the discussion of photosynthesis from the previous episode, here I outline the importance of the oxygen evolving complex in oxidising water molecules, the importance of photosystem I in extracting additional energy, and the role of light-independent reactions of the Calvin cycle in carrying out carbon fixation. Recommended pre-listening is Episode 101: Photosynthesis Part I. If you enjoyed the podcast please consider supporting the show by making a paypal donation or becoming a patreon supporter. https://www.patreon.com/jamesfodor https://www.paypal.me/ScienceofEverything

Transcript

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0:00.0

Oh, wow, oh, oh, oh, wow, oh, oh, wow.

0:13.0

Oh, wow.

0:15.0

Oh, my. Hello, you're listening to The Science of Everything podcast, episode 102, Photosynthesis Part 2.

0:40.4

I'm your host, James Fodor.

0:42.3

So in the previous episode, we began talking about photosynthesis.

0:45.1

In particular, I discussed an overview of what photosynthesis is, and I talked about

0:50.6

photosystem 2 and how that absorbs light in the chlorophyll molecules and how

0:55.9

the electrons are excited and pass through different components of the photosystem 2, eventually

1:01.2

passed on to Plastic Quinone, which diffuses through the thylacoid membrane, and is passed on

1:06.3

to cytochrome C complex, and I explained how that process is used to pump hydrogen ions across

1:13.7

from outside to inside the phylochoid membrane, and how that is used to generate a proton gradient.

1:20.4

So that's what we got up to at the end of the previous episode, and if that's all very unfamiliar

1:24.5

or you've forgotten, recommend relistenlistening to that because I'm just going

1:27.6

to pick up from where I left off there. In this episode, I'm going to start by explaining

1:32.1

how the oxygen evolving complex provides electrons that are subsequently energized by the

1:39.1

absorption of light and then pass through photosystem 2 and so on. I'm going to explain how

1:43.9

these electrons are sourced from, ultimately from water via the

1:47.9

oxygen-in-volving complex.

1:49.1

So this is a critical component to the process that I'll start by explaining, and then I'll

1:54.1

proceed by finishing off the story of photosynthesis by talking about Photosystem 1 and then ADP

2:00.1

reductase, and then also looking at the light

2:03.4

independent reactions and some other aspects of photosynthesis. So then let's begin by talking about

...

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