1,699 Answered Questions for the topic biochemistry

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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04/02/19

Is cancer caused by vitamin B17 deficiency?
I have read in an article on the internet that cancer is caused due to deficiency of vitamin B17 which has been removed from our diets long ago in the western food. But some people say that vitamin... more
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04/01/19

Are Gram negative bacteria classified as such because of their negative membrane potential?
Does the membrane potential usually quoted for Gram negative bacteria (e.g. E. coli) refer to the potential across both membranes? - If yes, then does the potential fall more over the inner or... more
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03/27/19

Hydrogen bonding in staggered vs eclipsed conformations?
In my first semester of organic chemistry, we learned that staggered conformations have lower energy/higher stability. However, my thought is that if you have interacting OH groups, the hydrogen... more
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03/27/19

What is the functional and structural distinction between core (H2A, H2B, H3,H4) and linker(H1/H5) histones?
Many explanations of histone biochemistry isn't quite elucidating for the undergraduate student. How does histone structure (dimers, octomers) relate to their specific functions as core or linker... more
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03/27/19

In mitochondria, what is the mechanism by which electrons are transferred between different cytochromes?
And how is the energy gained from the lowering of the "energy level" of the electron used to generate the chemiosmotic gradient?
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03/27/19

Membrane Permeability to Pyruvate?
Pyruvate seems to pass easily through the outer membrane of the mitochondrion but has difficulty entering the inner membrane (and gets in by H+ symport). I have two questions: (1) what property of... more
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03/26/19

Where does the 'C' in exhaled CO₂ mostly come from?
When a human being exhales CO₂, what is, by the numbers, the main source of carbon atoms exiting the body in this way? I mean what class of cells, or which tissues are the biggest on a pie chart of... more
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