No, transcription does not involve amino acids directly. Transcription is a biological process where the information in a segment of DNA is copied into a newly synthesized strand of RNA. Specifically, enzyme RNA polymerase synthesizes messenger RNA (mRNA) by reading the DNA sequence, which then leaves the nucleus and travels to the ribosome for protein synthesis. Amino acids come into play during translation, which follows transcription. During translation, the mRNA is decoded by a ribosome to produce a specific amino acid chain, or polypeptide, that will fold into an active protein. While amino acids are fundamental to protein synthesis, they are not part of the transcription process itself but rather the subsequent process of translation.

Dyeing locs can potentially damage them, similar to how dye affects other hair types. The chemicals in hair dye, specifically ammonia, peroxide, and other harsh substances, can dry out locs, leading to brittleness, breakage, and weakened roots. Since locs already have a tendency to be dry, applying dye exacerbates this condition. Additionally, the process of rinsing out the dye is challenging due to the dense nature of locs, which can lead to product buildup and further damage if not done thoroughly. However, using natural or less harsh dyes and ensuring proper aftercare, such as deep conditioning and regular moisturizing, can mitigate the damage. It’s also advisable to consult with a professional who has experience with dying locs to minimize potential damage.

Changing the PCV (Positive Crankcase Ventilation) valve in a Volvo XC90 is a task you can undertake to ensure your vehicle's engine runs efficiently. The PCV system helps to reduce harmful emissions by recycling part of the gas that would otherwise be released into the atmosphere. Here are the general steps involved in changing the PCV valve: 1. Locate the PCV valve: On the Volvo XC90, the PCV valve is typically situated on the top or side of the engine block. You may need to remove other components to access it. 2. Disconnect the hose: Carefully disconnect the hose attached to the PCV valve. Some clips or fasteners may require a tool for removal. 3. Remove the old PCV valve: Depending on your XC90 model, the PCV valve might just pull out, or it could be secured with a bolt or clip. 4. Install the new PCV valve: Place the new PCV valve in the exact position as the old one. Make sure it's securely fitted. 5. Reconnect the hose: Attach the hose back to the PCV valve and secure any clips or fasteners. 6. Check for leaks: Start the engine and check for any leaks around the new PCV valve area. Always consult your vehicle's manual for specific instructions, and consider getting professional help if you're not comfortable performing this task. Changing the PCV valve is crucial for maintaining your engine's performance and preventing potential oil leaks or buildup.