Hcg secreted by placenta not the fastest method to detect pregnancy nor it is specific
We can help in reducing the problem of waste disposal by these methods:
→ By separating biodegradable substances from non-biodegradable substances.
→ By reducing, reusing and recycling non-biodegradable substances.
The correct answer to two proteins that share 30% amino acid identity are 30% homologous is false.
Although homology can be inferred from excess similarity and excess similarity can be recognized from statistical estimates (E()-values), most researchers prefer to describe similarity in terms of "percent identity." Although it is a common rule of thumb that two sequences are homologous if they are more than 30% identical across their entire lengths (much higher identities are seen by chance in short alignments), the 30% criterion misses many easily detectable homologs. While 30% identical alignments over more than 100 residues are almost always statistically significant, many homologs with E()-values 1010 that are not 30% identical are readily found. As a result, E()-values and bit-scores (described below) are far more useful for inferring homology.
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Note that Facilitated diffusion , Active transport and Osmosis are three different ways of transporting substances across the cell surface membrane.
Facilitated diffusion is the movement of a substance from high to low concentration , similar to simple diffusion , but due to the complexity of the cell surface membrane , polar molecules and ions cannot just pass like that , so they pass through specific carrier and channel proteins in the cell surface membrane and so we call it facilitated diffusion.
For Active transport , it's the movement from low to high concentraion using energy from ATP
For Osmosis , it's totally different . You only name osmosis when its all about water . Its the net movement of water from high water potential to low water potential through partially permeable membrane .
If you're doing AS , you'll be familiar with Endosmosis and Exosmosis.