IB Biology SL - 2025 - Key Concepts
In the IB Biology SL (Standard Level) 2025 Key Concepts section, you will find summary videos that will help you review the most important concepts and skills necessary for success. They are ideal for a quick refresher before tackling questions in the Revision Village Questionbank or Practice Exams sections of the website.
Level of Organisation 1
Molecules
Enzymes
![Enzymes video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FG5lobIfMV3Y%2Fmqdefault.jpg&w=3840&q=75)
11 minutes
Protein Synthesis
![Protein Synthesis video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2F8f3KHXt7Yig%2Fmqdefault.jpg&w=3840&q=75)
9 minutes
Codons, Degeneracy, and Sickle Cell
![Codons, Degeneracy, and Sickle Cell video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2Fh1D5GaKfTuU%2Fmqdefault.jpg&w=3840&q=75)
10 minutes
Carbohydrates and Lipids
![Carbohydrates and Lipids video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FKB-Hdr2Kg40%2Fmqdefault.jpg&w=3840&q=75)
12 minutes
Structure and Function of Proteins
![Structure and Function of Proteins video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FTmo_zrQ5Ybo%2Fmqdefault.jpg&w=3840&q=75)
18 minutes
DNA Replication
![DNA Replication video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FhgfV7hdS8HI%2Fmqdefault.jpg&w=3840&q=75)
9 minutes
Level of Organisation 2
Cells
Cell Structure and Function
![Cell Structure and Function video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2F8aQe0_OoaEA%2Fmqdefault.jpg&w=3840&q=75)
11 minutes
The Nervous System 1
![The Nervous System 1 video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FNBwBslxm0wI%2Fmqdefault.jpg&w=3840&q=75)
10 minutes
The Nervous System 2
![The Nervous System 2 video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2Fb7cc__NrzYc%2Fmqdefault.jpg&w=3840&q=75)
7 minutes
Level of Organisation 3
Organisms
The Cardiovascular System
![The Cardiovascular System video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FkxCFjgX2urM%2Fmqdefault.jpg&w=3840&q=75)
22 minutes
The Respiratory System
![The Respiratory System video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FHgBBQbceK2o%2Fmqdefault.jpg&w=3840&q=75)
10 minutes
Inheritance
![Inheritance video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FfwSas1FvC14%2Fmqdefault.jpg&w=3840&q=75)
16 minutes
Homeostasis, Hormones and the Menstrual Cycle
![Homeostasis, Hormones and the Menstrual Cycle video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FJiMEGO6lbpU%2Fmqdefault.jpg&w=3840&q=75)
10 minutes
Level of Organisation 4
Ecosystems
Energy in Ecosystems
![Energy in Ecosystems video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2F6_ww0BM4HK0%2Fmqdefault.jpg&w=3840&q=75)
8 minutes
Carbon Cycle
![Carbon Cycle video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2FHK2c0hOPol0%2Fmqdefault.jpg&w=3840&q=75)
11 minutes
Evolution and Speciation
![Evolution and Speciation video thumbnail](/_next/image/?url=https%3A%2F%2Fimg.youtube.com%2Fvi%2F0hf5Wq3aEE8%2Fmqdefault.jpg&w=3840&q=75)
14 minutes
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