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6
votes
0answers
214 views

What bacteria shed harvestable energy from root zone organic matter?

I recently heard of a successful effort that harvests energy from soil at plants' bases due to apparently bacterial breakdown of wastes from the plants: Via photosynthesis a plant produces organic ...
5
votes
1answer
146 views

Why do we get tired [closed]

At the end of a day full of work, it is general for people that their eyelids start to feel heavy. Laziness takes over and we begin to yawn. We all know that we're tired at that time, but why people ...
4
votes
1answer
1k views

If oxygen is such a good energy source, why do plants release it?

Why do plants release excess oxygen, rather than consuming it entirely given it is an excellent energy source?
3
votes
1answer
59 views

Why is ATP converted into glucose

In photosynthesis ATP is produced in light-dependent reactions only to go to the Calvin cycle to be turned into glucose to make ATP during respiration: Why isn't this ATP just directly released ...
3
votes
1answer
40 views

Can a cell start a mitosis if it lacks energy or molecules to complete it?

I'm wondering whether a cell can start a mitosis if it lack molecules or energy to fully complete it. From what I'm reading on wikipedia the cell passes most of its time in the interphase in which the ...
3
votes
1answer
70 views

Catabolism and muscle energy intake

From my own reading, there are three ways used by the body to produce energy: Alactic anaerobic (direct degradation of ATP and creatine phosphate for regeneration of ATP) Lactic anaerobic (breakdown ...
3
votes
0answers
46 views

Why is ATP the main nucleoside triphosphate used to exchange energy? [duplicate]

Out of all of the nucleoside triphosphates what makes ATP the most used? Is it its structure? The amount of energy it contains? Why is GTP not used as much? What is the deal with the other nucleoside ...
3
votes
0answers
53 views

What makes the amide bond the lowest energy pathway? [closed]

I've reading about proteomics and how it can be used with mass spectrometry to sequence digested peptides. Reading this paper the author states (in box 2): peptide fragmentation induced by ...
2
votes
2answers
97 views

Why a continuous supply of energy is needed to support a weight?

What motivates this question is the apparent discrepancy between the concept of Work in physics and in physiology. Work in physics is defined as the dot product of the force applied to move a certain ...
2
votes
1answer
33 views

How can low cholesterol cause mortality?

I am studying processes 1. stroke, 2. heart disease, and 3. cancer, and their mechanisms associated with low cholesterol which is a result of lowering cholesterol especially in elderly, Low ...
2
votes
1answer
39 views

What dangers would the wireless transmission of power through microwaves pose to living organisms?

If we were one day able to harness the power of "wireless electricity", and INTEGRATE it into society, what disadvantages and/or dangers to living organisms would become relevant at that point? To my ...
2
votes
0answers
31 views

How do human cells respond to mechanical pressure such as heel contact during walking?

Basically, I'd like to do a full accounting (inventory, assets, liabilities) of a human cell under mechanical pressure. For example, if in steady-state, does the cell consume more or less energy ...
2
votes
1answer
62 views

Which step in endocytosis requires ATP?

Everybody seems to agree that endocytosis is an energy-using process, and as such requires ATP hydrolysis. However, which particular step requires it? More precisely, which 'molecular machine' ...
2
votes
0answers
187 views

Can a person's body produce enough electricity to break a wristwatch? [closed]

I know of someone who cannot seem to wear watches without the battery dying or something else about the watch going haywire. this person was told it is because their body is producing too much ...
1
vote
2answers
38 views

Is it possible to merge the genomes of photosynthesizing and electron-transporting bacteria to make an electric cell?

I had an idea of making electric current from bacteria. There are some bacteria that can photosynthesize, and some others are capable of transmitting electrons through each other. Is it possible that ...
1
vote
0answers
29 views

How much energy would it cost to synthesize all cholesterol requirements de novo?

Imagine a scenario in which some person is unable to absorb any dietary cholesterol because of some intestinal mutation (for example). Thus, they have no cholesterol available from their diet for ...
1
vote
0answers
41 views

Protein modification and ATP consumption

According to wikipedia there exists a lot of ways to modify a protein (post-translationally). Just to mention few: phosphorylation, dephosphorylation, glycosylation... While phosphorylation requires ...
1
vote
0answers
38 views

Why are carbohydrates the most common short-to-medium-term energy storage form in biology?

According to this table, gasoline has a specific energy noticeably higher than fat and more than twice that of carbohydrates; even short-chain hydrocarbons like ethanol and even methanol offer an ...
1
vote
1answer
74 views

What is the biological basis for tiredness after eating? [duplicate]

I can sometimes feel quite drowsy after some "meals" (e.g. a cold cut & cheese sandwich with juice on the side) and less drowsy (or maybe less often) after others (such as a salad). This ...
0
votes
1answer
50 views

What would happen if most the fat in your body was rapidly converted into energy in 2 minutes? [closed]

It all started out as an argument I had with my friend.He said that "it would be the equivalent of catching a fire and burning" But all I thought would happen is that you would now be very hyper ...
0
votes
1answer
28 views

Energy produced from respiration [closed]

Why is the amount of ATP Produced from anaerobic respiration is less than the amount produced from aerobic respiration?
0
votes
0answers
15 views

Lighting device efficacy for plant growth

Background Consider the following technologies: 100 lm/W OLED (2008, source) 303 lm/W LED (2014, source) 94 lm/W LEP (2015, source) For growing food, the preferred measurement is ...
0
votes
0answers
44 views

Meaning of 'forms of free energy'?

I was doing a practice exam paper and it asked for different 'forms of free energy'. I am a physicist rather then a biologist so 'free energy' to me means Gibb's Free Energy: $$G=H-TS$$ But I cannot ...