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How to calculate the turnover number?
Accepted answer
3 votes

Let's do some unit analysis: $\pu t$ = time $\pu U$ = units = $\mathrm{mol_{product}/t}$ $\pu s=$ specific activity $\mathrm{= U/g_{protein}}$ Therefore: $\mathrm{s = mol_{product} / (g_{protien} \...

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can a bacterium cell become a cancer?
3 votes

No - when bacterial cells grow in an invasive manner in the body, this is termed a bacterial infection. When one’s own cells grow in an invasive and uncontrolled way, it is termed cancer.

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Are androgenic-anabolic steroids a form of gene editing?
2 votes

Steroids are not a form of gene editing A gene is a sequence of DNA. Gene editing means changing this DNA sequence, kind of like changing the letters in a book. Essentially all drugs, steroids ...

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What does it mean to use DMSO as a dissolvant in biology experiemnts?
2 votes

Usually such compounds are dissolved in DMSO to make a concentrated stock solution (e.g. 1000x), which is then diluted into the culture medium. Often, the compound is soluble in water at this lower ...

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What physiological processes give rise to a linear cell survival curve?
Accepted answer
2 votes

Progressive cell death along a spatial dimension would be consistent with this. For example, imagine a cylinder of tissue in which cells at one face die, inducing adjacent cells to die. This would ...

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Name/term for mechanisms by wich the relative size/number of cells of some tissue/organ are preserved
1 votes

You are referring to organ “scaling” and “allometry”.

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Barr body in mitosis
1 votes

X inactivation is mediated by several epigenetic marks on DNA that cause condensation into heterochromatin. These include DNA methylation and histone modifications: https://en.wikipedia.org/wiki/X-...

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Glycolysis step 5: isomerization by triose phosphate isomerase
1 votes

"Why" questions in biology tend not to make sense- https://en.wikipedia.org/wiki/Teleology_in_biology But perhaps if I narrate the reaction it will connect with your intuition. Let's look at the ...

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use of antibiotics in selection of good plasmids
1 votes

Short answer: selection protocols are designed to work When choosing a selectable marker for a plasmid, one chooses a gene that is known to be absent in the host organism of interest. For example, ...

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difference between animal and plant durring organogenesis
1 votes

Our development is determined by our genes, encoded in our DNA. This is what makes a human who eats a salad develop differently from a pig, butterfly, or even bacterium eating that same salad. To ...

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Does turbidometeric method count cell number or cell mass?
1 votes

Your text says that scattering is proportional to cell number, which is correct. It is not inversely proportional, as you stated.

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When forming an enzyme-substrate complex in a spontaneous reaction, why free energy increases?
1 votes

This increase is the activation energy: https://en.wikipedia.org/wiki/Activation_energy

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Genotype -/- vs delta/delta
1 votes

The delta refers to a mutant allele, in this case a cysteine point mutant. The -/- refers to a homozygous null allele, in this case a knockout.

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Micelles Sticking Together
Accepted answer
1 votes

Micelles have a hydrophobic core and a polar, hydrophilic surface. This surface will preferentially associate with water molecules and become solvated, rather than sticking to lipids. Negative charge ...

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Biology and dna samples to determine parental lineage
1 votes

Before DNA sequencing was widely available, some lineage information could be determined using restriction fragment length polymorphism, a kind of "DNA fingerprinting". https://en.wikipedia.org/wiki/...

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Can something cause both breaks and cross-links in DNA?
0 votes

Ultraviolet radiation can induce both DNA crosslinking and double strand breaks. Here is a paper reporting sequnce determinants of UV-induced intra-strand crosslinks: https://www.ncbi.nlm.nih.gov/...

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Antiparallel DNA Strands - Error Correcting Code?
0 votes

As you have intuited, complimentary base pairing gives DNA molecules 2-fold redundancy. That is, given the base present on one strand, we can always deduce the base that should be at the corresponding ...

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Tissue fluid water potential
0 votes

Not necessarily- cells are surrounded by a plasma membrane that creates a waterproof seal from their surroundings. This membrane contains embedded proteins, called transporters and channels, that ...

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