What you can practice
可以练习的内容
Review the available topics below, then open the question bank to choose the sections, order, and number of questions for your session.
先查看下方可用主题，再打开题库选择练习范围、出题顺序和题目数量。
- Biomolecules, Cell Cycle, and Homeostasis 生物大分子、细胞周期与稳态
- Photosynthesis, Cellular Respiration, Fermentation, and Carbon Cycling 光合作用、细胞呼吸、发酵与碳循环
- Protein Synthesis and Mutations 蛋白质合成与突变
Account required to start: You can review this subject overview without an account. Registration is required only when you begin a practice session so your progress and wrong-answer review can sync safely.
开始练习前需要账号：无需账号即可查看本科目介绍。只有开始答题时才需要注册，以便安全同步学习进度和错题记录。
NextStep Education is a nonprofit organization. The question bank is free, and registration does not involve any charge.
NextStep Education 是非盈利组织。题库免费使用，注册不会产生任何费用。