When taken up into the human body from the diet, the 22 standard amino acids either are used to synthesize proteins and other biomolecules or are oxidized to urea and carbon dioxide as a source of energy.

When proteins are heated they become denatured ( unfolded ) and change texture.

When cells enter mitosis, the sister chromatids ( which represent the two copies of each chromosomal DNA molecule resulting from DNA replication earlier in the cell cycle and packaged by histones and other proteins into chromatin ) are linked all along their length by the action of the cohesin complex.

When food is cooked, some of its proteins become denatured.

When separating proteins or small nucleic acids ( DNA, RNA, or oligonucleotides ) the gel is usually composed of different concentrations of acrylamide and a cross-linker, producing different sized mesh networks of polyacrylamide.

When RNA polymerase transcribes these regions, it recruits the N and forms a complex with several host Nus proteins.

When a prion enters a healthy organism, it induces existing, properly folded proteins to convert into the disease-associated, prion form ; the prion acts as a template to guide the misfolding of more proteins into prion form.

When proteins bind specifically to other copies of the same molecule, they can oligomerize to form fibrils ; this process occurs often in structural proteins that consist of globular monomers that self-associate to form rigid fibers.

When a ribosome begins to synthesize proteins that are needed in some organelles, the ribosome making this protein can become " membrane-bound ".

When injected into plants, these proteins can enter the nucleus of the plant cell, bind plant promoter sequences, and activate transcription of plant genes that aid in bacterial infection.

After arriving an endosome via the pathway described above, vesicles begin to form inside the endosome, taking with them the membrane proteins meant for degradation ; When the endosome either matures to become a lysosome or is united with one, the vesicles are completely degraded.

When flour is mixed with water, the water-soluble proteins dissolve, leaving the glutenin and gliadin to form the structure of the resulting bread.

When studied outside the cell, the slowest folding proteins require many minutes or hours to fold primarily due to proline isomerization, and must pass through a number of intermediate states, like checkpoints, before the process is complete.

When the amount of copper in the liver overwhelms the proteins that normally bind it, it causes oxidative damage through a process known as Fenton chemistry ; this damage eventually leads to chronic active hepatitis, fibrosis ( deposition of connective tissue ) and cirrhosis.

When egg whites are beaten, some of the hydrogen bonds in the proteins break, causing the proteins to unfold (" denature ") and to aggregate non-specifically.

When voltage is applied along the gel, proteins migrate through it at different speeds dependent on their size.

When animal or plant matter is buried during sedimentation, the constituent organic molecules ( lipids, proteins, carbohydrates and lignin-humic compounds ) break down due to the increase in temperature and pressure.

When Di-n-butyl phthalate ( DBP ), diisobutyl phthalate ( DiBP ), benzyl butyl phthalate ( BBP ), Bis ( 2-ethylhexyl ) phthalate ( DEHP ) and di-n-pentyl phthalate ( DPP ) were combined, reductions in both testosterone synthesis and gene expression of steroidogenic pathway proteins were seen.

When a dough or batter is mixed, the starch in the flour mixes with the water in the dough to form a matrix ( often supported further by proteins like gluten or other polysaccharides like pentosans or xanthan gum ), then gelatinizes and " sets "; the holes left by the gas bubbles remain.

When Wüthrich joined the Bell Labs, he was put in charge of one of the first superconducting NMR spectrometers, and started studying the structure and dynamics of proteins.

When these cells are infected with a virus ( or another intracellular pathogen ), the cells degrade foreign proteins via antigen processing.

When I show up he will know you are a good wife to have told him about it ''.

When the Know-nothings get control, it will read, All men are created equal except Negroes and foreigners and Catholics.

When the reactionary response is thus bolstered by an intellectual defense, the characteristics of that defense are explicable only in terms of the basic attitudes of unanalyzed reaction.

When combined with the metaphysical notion that pure forms of this universe are best appreciated when least embodied in a material substratum, it becomes clear that while earth will be dross on a scale of material-formal ratios, celestial bodies will be of a subtle, quickened, ethereal existence, in whose embodiment pure form will be the dominant component and matter will be absent or remain subsidiary.

She used to tell me, `` When I stand there and look at the flag blowing this way and that way, I have the wonderful, safe feeling that Americans are protected no matter which way the wind blows ''.

When we consider the disorganized state of the world community, and the legacy of predispositions adversely directed against all who are identified as Jews, it is obvious that the struggle for the minds and muscles of men needs to be prosecuted with increasing vigor and skill.

When these fields are surveyed together, important patterns of relationship emerge indicating a vast community of reciprocal influence, a continuity of thought and expression including many traditions, primarily literary, religious, and philosophical, but frequently including contact with the fine arts and even, to some extent, with science.

When different colors are used, she is just as likely to color trees purple, hair green, etc..

When finally the two bedraggled men reach their friend's home, Voltaire's fears are once again aroused.

`` When are you to leave ''??

When the roof blocks are all in place, the final rows of wall blocks are mortared into position.

When the aid operations are reorganized the Peace Corps should remain a semi-autonomous, functional unit.

When the budget goes to trustees for approval it is the president's budget, to which his faith and credit are committed ; ;

When they have 4 to 6 leaves and are thrifty little plants, it's time to set them out where they are to remain.

When aircraft are no longer helpless on airfields, they are no longer vulnerable to Aj.

When more than two figures are separated by subtraction symbols the subtraction must be carried out from the left to right if the result is to be correct.

When they're on, the top edges are planed even with the sheer batten.

When painting, Mason's physical eyes are half-closed, while his mind's eye is wide open, and this circumstance accounts in part for the impression he wishes to convey.

When improvements are recommended in working conditions -- such as lighting, rest rooms, eating facilities, air-conditioning -- do you try to set a measure of their effectiveness on productivity??

When sufficiently accurate and complete measurements are available, it will be possible to set limits on the thermal and electrical characteristics of the surface and subsurface materials of the moon.

When some thirteen records of newly and recently born individuals are collated, little or no correlation between length and distribution can be detected.

When three dice are tossed repeatedly, what is the probability that the number of aces is 0 ( or 1, or 2, or 3 )??