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Questions tagged [chloroplasts]

The organelle in which photosynthesis occurs

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Is Thylakoid membrane continuous with the Inner membrane of Choloroplast?

This article mentions that thylakoid membrane is continuous with the inner membrane of cholorplast Thylakoid membrane encloses the innermost compartment or thylakoid lumen. The inner membrane of ...
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What happens when pure chlorophyll A absorbs blue light?

When pure chlorophyll A is put in the presence of only blue light, what happens? My guess is that the extra energy is released as heat/kinetic energy, and then the electron has dropped to the lowest ...
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Mobile carriers of Light reaction in higher plants

The hydrogen carrier PQ and the electron carrier PC are the mobile carriers in light reaction facilitating electron transfer from PS II to PS I during non-cyclic process. My question is - How do ...
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Difference in ATP synthesis in mitochondria and chloroplast

The mechanism of ATP synthesis in mitochondria and chloroplasts are almost the same, but there is a big difference: the f1 particle in mitochondria uses 2 H+ ions to synthesize one ATP, whereas in ...
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Is lumen space of a thylakoid completely separate from the intermembrane chloroplast space?

The question I have is whether thylakoids form actually completely independent "vacuoles" (i.e. independent membrane enclosed spaces) or whether the lumen space is connected to the intermembrane space ...
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Which biosynthetic pathways take place in the plastid and were are they located?

I know that the isoprenoid, jasmonate, glucosinolate, fatty acids, chlorophyll, starch, and aromatic amino acid syntheses are located in the plastid. But I don't know if they are located in the ...
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In the Kok cycle occurring in Photosystem II's Oxygen-evolving Complex, what exactly does P680 do?

I've been reading up on the oxygen-evolving complex using a few sources, but am a non-biology major so my understanding might be somewhat/very flawed. I've been using this source mainly: https://...
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Is there a known efficiency rate for CO2 capture from ambient air in photosynthesising plants?

When humans take in air to their lungs, we capture about 5% of the total quantity of the air as oxygen (which in turn equals about 24% of the available oxygen in the air) Is there an equivalent rate ...
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How long can algae survive with no air recycling (closed bottle)

In a small bottle nearly filled of Chlorella in water and grow medium, how long would it take for them to die (with or without light). Thanks in advance ;)
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Enhanced Spectrum Chloroplasts

As far as I'm aware, chloroplasts produce energy through the use of photosynthesis which essentiall converts CO2 and Water into Glucose (I'm an engineer by trade so really wracking my brains to the ...
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Mg in bacteriochlorophyll

In the figure 1A of http://photobiology.info/Jones.html the Mg is not belong to other structure. Is that because something is omitted or is it indeed like a pearl in a mussel's mouth? In the later ...
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Trouble understanding how uncouplers in the thylakoid membrane increase the rates of the Electron transport chain?

I am a undergrad in a cell physiology class and just did a learning exercise involving testing rates of the electron transport chain via the reduction of DCPIP, analyzed by spectrophotometry. ( I ...
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Why do chlorotic leaves have green veins?

If chlorotic leaves are chlorophyll deficient, why should the veins be green? shouldn't all the available chlorophyll be directed to the leaf lamina?
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Chloroplast arrangement in high and low intensity of light

I have read that there are different alignments of chloroplast according to the intensity of light. I read that in high intensity the chloroplast align themselves parallel to the incident light (...
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Explanation behind the observed chloroplasts in Elodea during Hypotonic vs Isotonic Solution

Me and my colleagues put the elodea leaf in distilled (hypotonic) and tap water (isotonic). We observed under the microscope that the elodea under the hypotonic solution became elongated and turgid, ...
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Absorption bands of chlorophyll

I am currently reading this article, which discusses the functional impact of the $Q_x$ and $Q_y$ absorption bands of chlorophyll in photosynthesis. However, the article didn't say where on the ...
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Calvin cycle- combining three "turns"

In the common Calvin cycle diagram, it is commonly stated that "three cycles are combined to show the production of 1 molecule of G3P". How does the G3P molecule escape from this cycle in ...
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How does an increase in CO2 concentration affect Photosynthesis and Transpiration

I noticed a strange thing in my book. At one place it says that an increase in CO$_2$ concentration in the outside air decreases the rate of transpiration but at the other place it says that an ...
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