1,722 Answered Questions for the topic biochemistry

03/19/19

How long does it take for a blocked dopamine receptor to be broken down by the body?
Do the blocked dopamine receptors get broken down by the body and if so how often ? In other words how long does it take for the dopamine receptors blocked by irreversible dopamine antagonists to... more
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03/19/19

Why antipyretics do not bring the body-temperature below normal?
Antipyretics like paracetamol are used to decrease the body-temperature in fever patients. But some of them are also used as pain-killers in sprain or other injuries (where there's no fever). In... more
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Biochemistry Pharmacology

03/19/19

What is the mechanism of action of lithium-induced polyuria?
I was reading in my pharmacology textbook on lithium in treating bipolar disorder, and I was curious to know if there was any specific action lithium takes to produce symptoms such as polyuria and... more
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03/18/19

How do single-celled predators chase other cells?
From my understanding, single celled organisms have been seen avoiding, and chasing, potential food or other organisms.How do they accomplish this? They do not have eyes or ears or a nervous... more
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Biochemistry Anatomy Neuroanatomy

03/18/19

How advanced is our understanding of the biochemistry and neuroanatomy of the brainstem?
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03/18/19

How, on a physical level, does ATP confer energy?
When ATP is used as the energy currency to make, say, reaction X + Y → Z happen, is what happens on a physical level down at the molecular scale that during the reaction---**ATP + H2O → ADP + Pi** ... more
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03/18/19

What is the purpose of the outer mitochondrial membrane?
The purpose of mitochondria is to generate ATP, utilising a chemiosmotic gradient across the inner mitochondrial membrane. Protons are pumped out of the mitochondria into the intermembrane space,... more
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Biochemistry Ecology Nutrition

03/18/19

Do plants have preference for the form of nitrogen as nutrient?
In the nitrogen cycle (ecology), it is usually described that plants can use nitrogen in the form of ammonium. Do plants prefer one form of nitrogen over the other?
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Biochemistry Physiology

03/18/19

Why pouring salt in the wounds is painful?
Pouring salt in the wounds is so painful. I am sure you all experienced this. whats happend there?
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Biochemistry Botany Plant Physiology

03/18/19

Biological Nitrogen Fixation?
I just studied Biological Nitrogen Fixation and saw it's reaction but i do not understand why there is 8 electrons and 8 protons are involved and Hydrogen molecule is formed side by side along with... more
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03/15/19

What type of reaction is 2-Ethoxybutan-2-ol + ethanol

WhAt type of reaction is ethanol +  2-Ethoxybutan-2-ol?
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03/15/19

What is the mechanism behind "acquired" alcohol tolerance?
I can understand natural variation in alcohol dehydrogenase (ADH) in a population leading to variation in rate of inebriation (after controlling for other variables -- e.g., mass, food consumption,... more
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Biochemistry Enzymes

03/15/19

Examples of enzymes working in reverse?
I have always been taught that enzymes can catalyze both the forward and reverse reaction, and will increase the reaction rate in both directions. I understand that the thermodynamics of the... more
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Biochemistry Metabolism Fat Metabolism

03/15/19

What is/are the molecular differences between HDL and LDL cholesterol?
Why exactly is HDL-cholesterol good for us and LDL-cholesterol bad for us. It has been well-established that LDL-cholesterol is associated with atherosclerosis and that HDL-cholesterol helps remove... more
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Biochemistry Enzymes Biophysics

03/15/19

Is the EC50 of an activating protein for an enzyme a good indicator for the binding affinity Kd?
We work with a membrane protein system where measuring the affinity between the enzyme and the upstream activating protein has been difficult, and when measured in detergent solution, it is almost... more
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Biochemistry Proteins Protein Folding

03/15/19

Differences Between Protein Motifs and Protein Domains?
I am in a 300-level molecular biology class and am unclear about this concept and how to delineate motifs versus domains of proteins. Any suggestions would be much obliged.
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Biochemistry Microbiology

03/15/19

Why don't antiseptic agents kill 100% germs?
I've seen innumerable antiseptic, mouthwash, handwash advertisements that claim to be able to eliminate as much as 99.9% of **all** germs over a surface...but why not the remaining 0.1% (i.e- why... more
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Biochemistry Physiology Human Biology

03/15/19

What is the mechanism behind "acquired" alcohol tolerance?
I can understand natural variation in alcohol dehydrogenase (ADH) in a population leading to variation in rate of inebriation (after controlling for other variables -- e.g., mass, food consumption,... more
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Biochemistry Chemistry

03/14/19

Why are inorganic compounds non-combustible?
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03/14/19

How exactly does marijuana damage brain cells?
I've heard that THC can cause permanent damage to brain cells. I've also heard this reffered to anti drug propaganda. Another theory i've read is that temporary effects reduce intelligence but long... more
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03/14/19

Why should I degas my gel solution for polyacrylamide gels?
In protocols for polyacrylamide gel electrophoresis (PAGE) I often see instructions to degas the gel solution by putting it under vacuum for 10-15 minutes before polymerizing the gel. I usually... more
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Biochemistry Zoology Entomology

03/13/19

How do ants follow each other?
I was observing ants in my house.They all were going in a straight line and also some of the ants were coming back through the the same line. I took some water and rubbed the line with my finger,... more
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03/11/19

Butanone + ethanol

What is the product of butan-2-one + ethanol the product of the reaction above reacts with ethanol to give what products?
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03/11/19

How can dissolved materials be moved from the outside to the inside of a cell when the inside concentration of the material is higher than the outside concentration?
a. Molecules can be moved into a cell against their concentration gradient if that transport is coupled with osmotic transport of water into the cell.b. Substances can be moved against a... more
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03/10/19

Products of a nonspontaneous reactions have a higher potential energy than the reactants. Which of the following statements are true? Select all that apply.
Select all that applya. ATP hydrolysis is an endergonic reaction that provides energy to drive exergonic reactionsb. Energy for nonspontaneous reactions comes from energetic coupling between... more
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