Free Biology Course for Students

Module 1 · Learn

Think like a biologist

Biology is the study of living things and the processes that make life possible. Biologists ask questions, collect evidence, compare patterns, and revise explanations when new evidence appears.

Vocabulary: observation is something noticed or measured. An inference is an explanation based on observations. A hypothesis is a testable explanation or prediction.

Which statement is an observation?The plant is sadThe stem grew 3 centimeters this weekThe plant wants more sunlightThe roots are thinking

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Module 2 · Visualize

Cells are the basic units of life

Most living things are made of cells. A cell membrane controls what enters and leaves. DNA carries genetic instructions. In eukaryotic cells, the nucleus stores most DNA. Mitochondria help release usable energy from food.

Model note: diagrams simplify real cells. Organelles are not always this shape, size, or color.

Plant and animal cells

Plant cells also have a rigid cell wall and chloroplasts. Chloroplasts capture light energy for photosynthesis.

Which structure contains most of a eukaryotic cell’s DNA?Cell membraneNucleusCell wallCytoplasm

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Module 3 · Build

Photosynthesis and cellular respiration

Plants use light energy to build glucose from carbon dioxide and water. This is photosynthesis. Cells can then break down glucose during cellular respiration to release energy in a usable form.

Model: photosynthesis stores energy in sugar; cellular respiration releases usable energy from sugar. The two processes connect organisms to the cycling of matter and flow of energy.

What is one major purpose of photosynthesis?To create lightTo store energy in glucoseTo remove all oxygen from airTo turn plants into animals

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Module 4 · Connect

Body systems work together

Body systems are groups of organs that work together. The digestive system breaks food into smaller molecules. The respiratory system exchanges gases. The circulatory system transports oxygen, nutrients, and wastes. The nervous system rapidly coordinates information and responses.

Systems thinking: no body system works completely alone. Running, for example, requires muscles, lungs, heart, blood vessels, nerves, and many chemical reactions working together.

Which system mainly transports oxygen around the body?Circulatory systemDigestive systemSkeletal system onlyIntegumentary system

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Module 5 · Explore

Information and interactions

Genes are segments of DNA that can influence traits by providing instructions used by cells. In ecosystems, organisms also interact with one another and with nonliving parts of the environment.

Food-web idea: arrows show the direction energy moves. If grass → rabbit → hawk, energy moves from grass to rabbit and from rabbit to hawk.

Changes to one population can affect many others, which is why ecologists study networks rather than isolated species.

In a food web, what do arrows usually represent?The direction animals walkThe direction energy moves between organismsWhich organism is oldestThe size of each population

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Module 6 · Share

Build a biology explanation model

Create a model that explains one biological system to a younger learner. Choose a cell, body system, food web, plant process, gene-to-trait pathway, or life cycle.

Your model must include

At least six correctly defined vocabulary terms.
A labeled visual or diagram.
Arrows or notes that show a process or relationship.
A paragraph explaining one limitation of your model.
Three questions that could check another student’s understanding.

Why should a scientific model include limitations?Because every model is a simplified representationBecause science does not use evidenceBecause labels are not allowedBecause diagrams must be wrong

Short response

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Course milestone reached

You completed the guided course.

Your final project or practical assessment is the last step before certificate eligibility. Signed-in certificate issuance should be verified against the full completion requirements.

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Certificate of Completion

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Biology Foundations

Think like a biologist

Cells are the basic units of life

Plant and animal cells

Photosynthesis and cellular respiration

Body systems work together

Information and interactions

Build a biology explanation model

Your model must include

You completed the guided course.

Certificate of Completion

Cell biology beginner guide