To memorize amino acids for the MCAT, start by categorizing them into groups: nonpolar, polar, acidic, and basic. Create mnemonic devices to remember each category, such as "Santa's Team Crafts New Quilts" for serine, threonine, cysteine, asparagine, and glutamine (polar amino acids). Use flashcards, drawing each amino acid structure repeatedly can reinforce memory through visual learning. Incorporating spaced repetition software like Anki can ensure you're reviewing the amino acids regularly without overwhelming yourself. Also, connecting each amino acid to a function or characteristic (e.g., glycine is small and fits into tight spots) can help anchor them in your memory. Lastly, practice by writing them out and quizzing yourself in different orders, not just alphabetically.

Polyethylene glycol (PEG) is found in a variety of medications due to its ability to deliver drugs effectively. It's commonly used in laxatives like MiraLAX for treating constipation due to its osmotic effect, drawing water into the bowel. PEG is also a component in some bowel preparation products used for colonoscopy preparations, such as Moviprep and GoLYTELY. Additionally, PEG can be found in certain topical creams and ointments, serving as a base that facilitates the application and absorption of the medication onto the skin. It's vital to note that while PEG is generally considered safe, some individuals may experience allergic reactions. Always consult with a healthcare provider before starting any new medication, especially if there's a known allergy to PEG or similar substances.

Virgin Polypropylene (PP) is a type of plastic widely used in various industries due to its flexibility, chemical resistance, and durability. The price of virgin polypropylene fluctuates based on several factors including crude oil prices, demand and supply dynamics in the market, and production costs. As of the latest data in 2023, prices can vary significantly based on these conditions and geographical location. Additionally, environmental policies and the push towards recycled materials can impact the demand and pricing of virgin polypropylene. It's advisable for buyers to stay informed about market trends and consider long-term contracts to mitigate price volatility. Moreover, exploring alternatives or recycled PP could be beneficial both cost-wise and for sustainability goals.