The set of chemical reactions that happen in the cells of living organisms to sustain life.

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539 views

Why does the hydrolysis of ATP increasing entropy increase the Phosphoryl-­‐transfer Potential?

I am currently taking a biology class. I do not understand this concept. I understand that the electrostatic repulsion of the negative charges, resonance stabilization and hydration stabilization all ...
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53 views

Where do the H+ ions come from in light reactions?

In the light-dependent reactions of photosynthesis, H+ ions pass to the thylakoid space. Where do these protons come from?
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125 views

Why do plants produce so much more sugar than they use?

I recently asked the question, "Do plants need O2 to consume energy they've stored via sugar?" to which @canadianer responded, "Yes, plants require oxygen to generate ATP from sugar. However, they ...
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12 views

How reactive are reduced antioxidant molecules?

When antioxidant molecules stabilize free radicals, they themselves become unstable and reactive but to a lesser degree. How reactive are these reduced antioxidant molecules? And what substance ...
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68 views

Regulation of Cra protein level in E coli

Catabolite Activator/Repressor, Cra protein (formerly known as Fructure Repressor FruR) plays a significant role in central carbon metabolism of E coli. Its activity is inhibited by ...
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152 views

How do cells slowly degrade 5,5'-dibromo-4,4'-dichloro-indigo?

5,5'-dibromo-4,4'-dichloro-indigo is the product of X-gal cleavage, often used as a reporter with B-galactosidase. I've made the (unreferenced) observation that it seems as though the blue product ...
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112 views

What impacts on metabolism are likely from the 6x increase in water consumption by Americans at restaurants since the 1950s?

CDC data show that American water consumption in restaurant meals is 600% of what it was in the 1950s while meal calorie density has decreased (kcal/oz). What impacts is this likely to have on the ...
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225 views

How to determine the actual flux in the human metabolic model of a cell line?

The problem to be solved is to determine what the flux values are for the different reactions in the human metabolic model. As far as I understand, a good way to do that would be to use gene ...
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28 views

What does “each pathway define an independent genotype” mean?

In a section of this paper. However, if the question of independency is posed in the form: “Does each pathway shown define an independent genotype?,” then each of these three pathways is ...
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90 views

What organism most efficiently converts a given quantity of mass into heat?

Question I am trying to answer: In the popular film The Matrix, heat given off by humans is harvested as an energy source. I wondered, if this were possible, would humans be a good organism to ...
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119 views

How might one determine if bacteria are nitrogen fixing or not?

If you had an isolate bacteria sample how would you determine if they were nitrogen fixing?
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Beta oxidation of saturated fats

In my text book there is an example of a 18 carbon long fat and it says that it can run 8 laps of oxidation. I don't understand why it doesn't run 9? 2 are removed each cycle? Thanks.
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Do plants need O₂ to consume energy they've stored via sugar?

This question came up as I work my way through the answers to another question I just asked. My understanding is that plant photosynthesis looks something like this (though with lots more going on ...
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41 views

Feedback affecting myocyte metabolism in humans

I understand that there are several reserves available to muscle that can be tapped for ATP, and that each reserve is being used to some degree at all times. Are these reaction rates purely due to ...
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9 views

What's the relationship between Drugbank drugs and SMPDB pathways?

In the 'pathway browse' panel SMPDB pathways and their corresponding Drugbank drugs are listed. What are the relationships between the drugs and the pathways? Some listed drugs are not in the ...
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15 views

Is it possible to measure Secondary Bile Acid Kinetics?

Is it possible to measure secondary bile acid kinetic and flux measurements in vivo? Anyone have any experience with this sort of technique?
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19 views

Cell energy consumption and food intake

I am wondering if each cell in human body starts consuming ten percent more energy, how much food one has to consume compared to normal intake?
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61 views

Does ale give less of a hangover than a lager?

I got into an argument surrounding beer type and hangover. Apparently there is a opinion that ales give you less hangover than lagers do (considering same alcohol content consumed). My understanding ...
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38 views

Why doesn't the body optimize how many fatty acids it burns?

Ketone bodies are produced due to an excess of fatty acids being burned (accumulation of acetyl-CoA) so my question is: Why doesn't the body simply regulate how many fats it burns so it doesn't have ...
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112 views

Which Enzymes Catalyse the Deacetylation of Drugs in the Human Body?

If you would like more specifics seeing how I realise that this question is very broad and may be difficult to answer in general then hopefully the following will help you out: I am particularly ...