Scientists produce two polypeptides, X and Y. Both are the same length and contain exactly the same number and types of amino acids. However, the amino acids occur in a different sequence. Under identical conditions: - Polypeptide X shows 100% relative binding to a target molecule. - Polypeptide Y shows only 8% relative binding. Which statement best explains the difference? 💬 Choose your answer and add one sentence of biological reasoning. A letter by itself does not count!

The Unit 1: Chemistry of Life Reading Guide and Student Workbook have now been updated and added to the course. Use the Reading Guide alongside the video lessons to strengthen your understanding, then complete the matching Workbook activities to practise AP-style thinking and scientific reasoning. The Workbook does not include an answer key, so post your attempted answers or questions in the lesson comments whenever you need support. Let’s learn through discussion and help everyone work toward a 5 in AP Biology! 🧬 What are you currently most unsure or worried about in AP Biology? Your responses will help guide future explanations, practice, and support.

Hi everyone! I’ve been working hard on new Unit 1 and Unit 2 Reading Guides and Workbooks to make the content easier to understand, build confidence with AP-style questions, and support you step by step. Both units are still works in progress, but I’m hoping to post Unit 1 by the end of this week. Your feedback, suggestions, and ideas are always welcome—we are building these resources together! My goal is to help every student in this group feel supported, grow in confidence, and believe that earning a 5 in AP Biology is easy! Let’s keep learning and improving together!

Hi, to all the new students that have joined! If you have any questions don't hesitate to reach out.

You can now find all the Unit 2 lessons inside the Classroom. This unit is all about cells, membranes, transport, organelles, and how cells stay organized and alive — basically, the tiny-but-powerful world inside living things. 🧬🔬 Go check it out, start working through the lessons, and if you have any questions, please ask! I’m happy to help!