Tag: biochemistry

biochemistry – What software is used to generate the PDB molecule of the month images?

The Question : 24 people think this question is useful What software does the PDB use to generate these “cel-shaded” protein models with outlines around foreground atoms? (Leptin: May 2012 Molecule of the Month by David Goodsell) The Question Comments : QuteMol is one of the software that can do that… The Answer 1 27

everyday chemistry – Why is heroin a more potent drug than morphine, despite having a similar structure?

The Question : 25 people think this question is useful The structures of heroin and morphine are quite similar, with heroin being formed by acetylation of morphine: Why is heroin so much more potent than morphine, when their structures are so similar? What biochemical effects lead to heroin’s prevalence as a recreational drug, and consequently,

everyday chemistry – Why is the Vitamin B complex, a “complex”?

The Question : 27 people think this question is useful I often come across the term “Vitamin B Complex” in my biology classes and innumerable times on the back of multivitamin packets, but what does the term “complex” here, even mean? I’m still in high-school, and the only times we ever come across the term

organic chemistry – Why is methanol toxic?

The Question : 32 people think this question is useful There are two points of view for the answer of this question: The biological view, the only one that I faced during my research, states that since it can trigger perilous conditions like metabolic acidosis, cause a neurologic sequelae, etc. methanol is toxic. The chemical

everyday chemistry – Effect of drinking ultra-pure water

The Question : 32 people think this question is useful What would be the effect if someone were to drink ultra-pure water with an electrical resistivity of $18 \, \mathrm{M} \Omega \! \cdot \! \text{cm}$? Would they immediately die? Would they just need to pee more? Would $\ce{CO2}$ from the air (after the bottle is

biochemistry – Why does carbon monoxide have a greater affinity for hemoglobin than oxygen?

The Question : 36 people think this question is useful Hemoglobin is an iron-containing oxygen transport metalloprotein in the red blood cells of most mammals. Simply put, it’s a carrier protein. Interestingly it doesn’t carry carbon dioxide in the same way it does for oxygen $\ce{O2}$. Oxygen binds to the iron atoms in the protein

biochemistry – Why does menthol (e.g. peppermint) feel cool to the tongue?

The Question : 49 people think this question is useful Especially when drinking water after the fact, mint can give a sharp cold sensation inside one’s mouth. What process causes the sensation to occur? The Question Comments : There is a really excellent, detailed answer to this here (boundlessthicket.blogspot.com/2012/04/…). If you’d like me to summarize

biochemistry – Why isn’t aluminium involved in biological processes?

The Question : 49 people think this question is useful There are so many biological processes which are dependent upon ions of lighter metals (upper part of periodic table) such as $\ce{K+}$, $\ce{Na+}$, $\ce{Mg^{2+}}$ and even early transition elements ($\ce{Fe}$, $\ce{Mn}$, $\ce{Cu}$, $\ce{Ni}$), but I haven’t yet come across dependence of biological phenomena on aluminium.

inorganic chemistry – Do all salts taste salty?

The Question : 76 people think this question is useful Recently, I am learning the production of soluble and insoluble salts. My friend and I have done this experiment at the school lab. We wanted to taste them to see whether they are salty are not. The teacher luckily stopped us from doing that. So

everyday chemistry – Does water really ‘go bad’ after a couple of days?

The Question : 81 people think this question is useful Among my friends it is a sort of ‘common wisdom’ that you should throw away water after a couple of days if it was taken from the tap and stored in a bottle outside the fridge, because it has ‘gone bad’. First of all, the