1,708 Answered Questions for the topic biochemistry

04/20/19

Death because of distilled water consumption?
One of my friends said that I would die if I drank distilled water (we were using it in a chemistry experiment) I gave it a go and surprisingly did not die.I did a bit of... more
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Biochemistry Amino Acids Rna

04/19/19

What is the explanation for the smaller number of tRNA than codons?
> Translation, or decoding, of the four-nucleotide language of DNA and> mRNA into the 20–amino acid language of proteins requires tRNAs and> enzymes called aminoacyl-tRNA synthetases. To... more
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04/19/19

What is the relationship between the light and dark reactions of photosynthesis?
My main concern is why are the dark reactions (those that produce hexose) needed? As far as I understand, the sole purpose of photosynthesis is to synthesize carbohydrates, which are only used for... more
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Biochemistry Microbiology

04/19/19

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 can't... more
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04/18/19

Why do we have no enzyme to digest cellulose?
As we know, cellulose is the most abundant polysaccharide in nature. Why don't we have an enzyme to digest cellulose?
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Biochemistry Metabolism

04/18/19

Why can't the brain and red blood cells use fuels other than glucose?
The question is rather straight forward: I have always been curious as to why, but cannot find an explanation online.I can imagine that the mechanism is different for each, but **why does brain... more
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04/16/19

What's the mechanism for being mentally tired?
I notice that after long tests, or long periods of critical thinking, my body and mind feel noticeably tired. Why does this happen? Are the neurons in my head not firing as quickly, or is there... more
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Biochemistry Science Biology Anatomy

04/14/19

Why is ATP an important molecule in metabolism?
a. Its terminal phosphate group contains a strong covalent bond that does not contain much chemical energy b. Its hydrolysis provides an input of free energy for exergonic reactionsc. It provides... more
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Biochemistry Science Biology Chemistry

04/14/19

The major function of fermentation in our muscle cells is
A. to reduce NAD+ to NADHb. to generate lactic acid, which is later converted into fatty acid, which is a form of stored chemical energyc. not really known, and in fact it is believed fermentation... more
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04/14/19

What process below would speed up a reaction by lowering the activation energy?
A. Adding heatB. Adding a catalystC. Increasing the amounts of reactantsD. Increasing the entropyE. All of the above would speed up a reaction by lowering the activation energy
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Biochemistry Biology Chemistry

04/14/19

All chemical reactions that occur spontaneously
A. are endothermicB. Produce products that are more disordered than the reactantsC. Do not proceed more rapidly with provided heatD. Have a negative Delta G
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Biochemistry Biology

04/13/19

How can you distinguish poisonous mushrooms from edible ones?
The best rule to follow about telling safe mushroom from poisonous mushrooms is not to try! Despite what anyone may tell you, despite any "methods" you may know for telling them apart, you should... more
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04/12/19

What are the top 10 websites a chemistry student must visit?
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Biochemistry Pharmacology Cell Biology

04/11/19

What do proton pump inhibitors do?
I know that sodium azide and 2,4-DNPH inhibit proton pumps. The azide is called an inhibitor and 2,4-DNP is called uncoupler. I want to know what's the difference between the mechanisms of action... more
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Biochemistry

04/11/19

How to solve this?
You have been provided with 250 ml of a stock solution of 5 M Sodium acetate. Explain how you would prepare 100 ml of 0.5 M Sodium acetate working solution from the given stock.
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04/11/19

Human perception of time depending on age?
From what I can tell and what thus far all people with whom I discussed this subject confirmed is that time appears to "accelerate" as we age.Digging a little, most explanations I found basically... more
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Biochemistry Dna Evolution

04/11/19

Why are there exactly four nucleobases in DNA?
Does someone know why DNA is composed of four nucleobases? In particular, is there an explanation for the number? Why four and not two, or eight?
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04/09/19

Is HSV-vector-mediated miRNA expression in dorsal root ganglia stable?
My question is on the following article: "*[Reduction of voltage gated sodium channel protein in DRG by vector mediated miRNA reduces pain in rats with painful diabetic... more
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Biochemistry Ecology Climate Change

04/06/19

What are the ecological effects of moderately high and prolonged concentrations of nitrogen deposition on an ecosystem?
There are many sources of nitrogen which eventually get deposited out of the atmosphere and onto the land/surface. Typically higher levels of nitrogen compounds are emitted near urban and roadway... more
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04/05/19

What is the advantage of using plant-derived antibacterials rather than bacteria-derived antibacterials?
So obviously we have a big problem with antibiotic resistance. Most of our antibiotics originate from bacteria themselves (or are synthetic variations on scaffolds which originate from bacteria). I... more
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Biochemistry Enzymes Proteins

04/04/19

What effect has changing pH and salt concentration on protein complexes?
I'm struggling to find peer reviewed literature that explains the effect of changing the pH and the salt concentration on protein/protein complexes in solution. What effect does the pH and the salt... more
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04/04/19

Why does a "cascade" of events happen during signal transduction?
I've been watching some videos on signal transduction and it says that because there are enzymes being activated by the signal, then there is a "cascade" which happens afterwards...I don't... more
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04/03/19

How does paracetamol work?
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Biochemistry Chemistry

04/03/19

1.812 g of a crystallized a-amino acid (pka1=2.4, pka2=9.7) has a pH of 10.4 when dissolved in 100 mL of 0.1M NaOH. Calculate the molecular mass of this amino acid.
1.812 g of a crystallized a-amino acid (pka1=2.4, pka2=9.7) has a pH of 10.4 when dissolved in 100 mL of 0.1M NaOH. Calculate the molecular mass of this amino acid.
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04/03/19

How do ion channels transport only specific ions?
Ion channels, such as $Na^+$ channels and $K^+$ channels, are higly specific for ion permeability. But how do these channels achieve and maintain this specificity? Like how does a $K^+$ channel... more
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