Enzymes denature proteins when they are exposed to extreme conditions such as high temperatures or extreme pH levels. These conditions disrupt the bonds that maintain the protein's specific shape, causing the protein to unfold and lose its function. Once denatured, the enzyme is no longer able to catalyze chemical reactions effectively. **

Glycerol does not denature proteins because it is a non-polar, neutral molecule that does not disrupt the hydrogen bonding and hydrophobic interactions that maintain the protein's structure. Glycerol can form hydrogen bonds with water molecules, but it does not interfere with the hydrogen bonds within the protein. Additionally, glycerol can help stabilize proteins by reducing the effects of temperature and pH changes, making it a useful additive for protein storage and preservation. Overall, glycerol's chemical properties make it a suitable substance for maintaining the stability and structure of proteins. **

Yes, lemon juice can denature a raw egg. The acidity of the lemon juice can cause the proteins in the egg to unfold and bond with each other, leading to a change in the texture and appearance of the egg. This denaturation process is similar to what happens when an egg is cooked, but the effect may be less pronounced and the egg may not fully solidify. **

Amylase denatures at temperatures above 60-70 degrees Celsius. This means that the enzyme's structure and function are disrupted, rendering it ineffective. Denaturation occurs because the high temperature breaks the bonds that maintain the enzyme's specific shape, leading to a loss of its catalytic activity. **

Proteins usually denature when acids or bases are added because the change in pH disrupts the protein's structure and function. Proteins have specific three-dimensional shapes that are essential for their biological activity. When the pH is altered, the charges on the amino acid side chains within the protein can be affected, leading to changes in the protein's folding and stability. This disruption in structure can cause the protein to unfold and lose its functional properties, a process known as denaturation. **

To apply a new waterproofing membrane on top of an old bitumen waterproofing membrane, the surface of the old membrane should be thoroughly cleaned and prepared. Any loose debris, dirt, or old adhesive should be removed to ensure proper adhesion of the new membrane. Once the surface is clean, a primer should be applied to promote adhesion between the old and new membranes. Finally, the new waterproofing membrane can be installed according to the manufacturer's instructions, ensuring that it is properly sealed and bonded to the old membrane to provide effective waterproofing. **

A utility knife or a sharp blade is typically used to cut the waterproofing membrane. It is important to use a sharp tool to ensure clean and precise cuts, which will help in achieving a proper seal and prevent water leakage. Care should be taken to avoid damaging the underlying surface while cutting the membrane. **

Ideally, the waterproofing membrane should be applied in dry weather to ensure proper adhesion and effectiveness. If the membrane is applied and then it rains before it has fully cured, it can compromise its ability to create a watertight seal. Water exposure during the curing process can lead to delamination, reduced adhesion, and potential leaks. Therefore, it is best to apply the waterproofing membrane when there is no rain in the forecast and allow it to fully cure before any water exposure. **