Which of the following is not common to the chloroplast and mitochondria? a. Both use membranes

Which of the following is not common to the chloroplast and...

Key Concepts

Membrane Gradients

Membrane gradients refer to the differences in ion concentrations across a membrane, which are harnessed by both chloroplasts and mitochondria to drive the synthesis of ATP through chemiosmosis. This process is fundamental to energy conversion and is integral to the function of these organelles, enabling them to generate a proton motive force that powers ATP synthase.

Electron Transport Chain

The electron transport chain (ETC) is a series of protein complexes located in the membranes of both chloroplasts and mitochondria. It facilitates the transfer of electrons through these protein complexes, ultimately leading to the creation of a proton gradient that drives ATP synthesis. While the specific substrates and electron donors differ, the underlying mechanism of using an ETC to drive chemiosmosis is common to both organelles.

Photosynthesis

Photosynthesis is the process by which light energy is converted into chemical energy, a function that is unique to chloroplasts and is not shared by mitochondria. In photosynthesis, sunlight is captured by pigment molecules to drive the light-dependent reactions, leading to the production of organic compounds from carbon dioxide and water.

Enzymatic Activity

Both chloroplasts and mitochondria contain a wide variety of enzymes that facilitate numerous metabolic pathways. These enzymes are essential for processes such as the citric acid cycle in mitochondria and the Calvin cycle in chloroplasts, demonstrating the role of enzymatic reactions in driving the biochemical activities necessary for energy transformation and cellular metabolism.

Transcript

00:01 All right.

00:03 So this question deals, i think, with one of the coolest topics in all of biology.

00:09 So comparing and contrasting chloroplasts and mitochondria.

00:14 So on the left side here, we have the chloroplast and we basically have a overview of the light reactions.

00:23 So in the light reactions, you are taking sun, so energy from the sun, and water, you are splitting water.

00:32 And you are splitting that water into hydrogen and oxygen.

00:39 The oxygen is being output from the leaves, and then the hydrogen is being split into a proton and into an electron.

00:47 This electron is being put through the electron transport chain pumped outside.

00:54 This creates a gradient inside of the thyloprase.

01:00 And then this gradient is used to drive the atp synthetase.

01:08 And then this hydrogen and then that electron combined together to make an adhd.

01:16 So after the hydrogen gets pumped out of the thylacode membrane and making atp, you then get the atp and nadh that you made there to make glucose.

01:34 Now, what happens in the mitochondria during cellular respiration? so, prior to coming to the electron transport chain here in the mitochondria, you had glucose that basically through the citric acid cycle gave us a bunch of nadh and fadh too.

02:01 I'm just going to follow nadh here for simplicity's sake.

02:04 This got split into nad plus plus hydrogen.

02:10 The hydrogen here got split into h plus and e minus, the electrons.

02:19 What happened to the electrons? the electrons are used to go through the electron transport chain and they go on the inside.

02:28 And as the electrons drop in energy from protein to protein in the electron transport chain, is used to pump hydrogens outside.

02:44 And as the hydrogens gets pumped outside, they get then used to come back inside and drive atp synthetase to make atp.

02:55 And then ultimately, the hydrogen and the electron get combined with oxygen to make h2o...

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