Week 1 — The Science of Biology

Why this matters

A nursing student reading a drug trial and a gardener deciding if a fertilizer is worth the money need one habit: change one thing, hold the rest steady, and let the evidence speak.

In plain language

Biology is the science of living things, and this week you learn how biologists decide what counts as alive. You will meet the characteristics of life (the seven properties that, taken together, mark something as living) and the ladder of sizes biologists use to place any living structure. You will learn the scientific method (the loop of observing, asking, predicting, testing, and concluding that turns a hunch into evidence) and how to read a simple experiment from start to finish. You will also see why a theory (a broad explanation backed by a large body of repeated tests) is the strongest idea in science, not a guess. Finally, you will meet evolution (change in the inherited traits of a population over generations), the idea that ties all of biology together.

• This week: what makes something alive, how life is organized, how controlled experiments test ideas, hypothesis versus theory, and evolution.
• How they connect: this chapter is the foundation; every later week uses the habits you build here.
• Where we're going next: Week 2, The Chemistry of Life, zooms in to the bottom rungs of the ladder, atoms and molecules, and explains the penny result through water's chemistry.

Focus

What makes something alive, and how do biologists test what is true?

By the end of this module, you should be able to:

• [ ] sort a thing as alive or not with all seven characteristics of life
• [ ] put the levels of organization in order and name an emergent property
• [ ] name the variables and control group of an experiment
• [ ] compute an average and a range, and tell a hypothesis from a theory

To-do

Plan your week

1. Read Chapter 1 (about 40 minutes), then the lecture and slides.
2. Work the lecture tutorial (60–90 minutes) and the practice set (about 20 minutes).
3. Run the Biology Lab & Inquiry (about 2 hours), then the discussion and the assignment.
4. Take the quiz.

This week's checkpoint: name the variables and control group of a simple experiment, and state its conclusion with supports, not proves.

You've got this

Take it in order, and ask your instructor if a step snags.

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