Duration of the online course: 1 hours and 33 minutes
4.5
(6)
If biology has ever felt like a blur of unfamiliar terms, this course helps you build a clear foundation you can trust. You will connect big-picture ideas about life with the practical tools scientists use to investigate it, so the subject stops feeling like memorization and starts feeling like understanding. Designed for school-level learning, it supports you in developing confidence for homework, exams, and future science classes.
You begin by exploring what biology studies and how scientists turn questions into testable investigations. By focusing on the scientific method, hypotheses, and evidence-based reasoning, you learn how to judge claims using data instead of guesswork. You will also strengthen your ability to think about variables, controls, and fairness in testing, which is essential not only in biology labs but in everyday decision-making where evidence matters.
From there, the course bridges biology with the chemistry that powers living systems. You will make sense of elements and atoms, then move into the molecules of life: carbohydrates, proteins, lipids, and nucleic acids. Rather than treating these as separate definitions, you will see how their structures relate to their roles in organisms—how building blocks like amino acids and nucleotides help explain everything from energy use to heredity. You will also learn the difference between vitamins and minerals and why that distinction matters in human nutrition.
Finally, you focus on water and the chemical environment of cells. You will understand hydrogen bonding, why water is such an effective solvent, and how these properties make life as we know it possible. You will also learn what pH measures and why changes in acidity can affect biological systems. Along the way, practice questions help you check your understanding, spot gaps early, and study more efficiently. By the end, you will have a solid, connected framework that makes the rest of biology far easier to learn.
Video class: Biology overview
04m
Exercise: What fundamental characteristic of life is highlighted as a topic that will be studied in the Khan Academy's Biology section?
Video class: The scientific method
11m
Exercise: What is a key aspect of a hypothesis in the scientific method?
Video class: Data to justify experimental claims examples | High school biology | Khan Academy
05m
Exercise: Based on the biological principle that muscles perform better when adequately warmed up, what is the most likely reason trial two supported the student's claim better than trial one in the given experiment?
Video class: Introduction to experimental design | High school biology | Khan Academy
09m
Exercise: Which of the following is NOT a fundamental principle of a well-designed scientific experiment?
Video class: Elements and atoms | Atoms, compounds, and ions | Chemistry | Khan Academy
13m
Exercise: The most basic unit of an element is the:
Exercise: What defines the element of an atom?
Video class: Introduction to carbohydrates | Biology foundations | High school biology | Khan Academy
04m
Exercise: Which of the following best describes the elemental composition ratio of carbohydrates similar to that of water?
Video class: Introduction to proteins and amino acids | Biology foundations | High school biology | Khan Academy
05m
Exercise: What are amino acids commonly referred to in the context of proteins?
Video class: Introduction to lipids | Biology foundations | High school biology | Khan Academy
05m
Exercise: Which of the following statements best describes the solubility of lipids in water?
Video class: Introduction to nucleic acids and nucleotides | High school biology | Khan Academy
05m
Exercise: Which of the following is NOT a component of a nucleotide?
Video class: Introduction to vitamins and minerals | Biology foundations | High school biology | Khan Academy
06m
Exercise: What distinguishes vitamins from minerals in the context of human nutrition?
Video class: Hydrogen bonding in water | Water, acids, and bases | Biology | Khan Academy
06m
Exercise: Why is water considered essential to life as we know it?
Video class: Water as a solvent | Water, acids, and bases | Biology | Khan Academy
09m
Exercise: Which of the following explanations best describes why water is considered a good solvent?
Video class: Introduction to pH | Biology foundations | High school biology | Khan Academy
05m
Exercise: What does the pH Scale Measure?
1 hours and 33 minutes of online video course
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Course comments: Biology foundations
basiru Suleiman
biology
fatima jahan
Amazing teaching style learned so much , would recommend it to other students your notes were great.
Fatima Hussain
fantastic test were fair without being easy
Jade Scott
I am grade 4
Fatima Hussain
great app for students