Biology

What you will learn

• Explain how cells carry out life processes.
• Trace how organisms use matter and energy.
• Model inheritance and gene expression.
• Explain evolution using evidence.
• Analyze ecosystems and experimental data.

Common challenges

• Many new terms

  Connect each term to a drawing or example. Practice explaining the idea before trying to memorize its label.

• Following processes

  Photosynthesis and cell division involve connected steps. Draw arrows showing inputs, outputs, and where each step happens.

• Interpreting evidence

  A claim needs support from observations. Separate the data from your explanation and consider what else could affect the result.

Key concepts

Cells

Cells are the basic units of life. Their structures help them obtain resources, process information, and reproduce.

Homeostasis

Living systems regulate internal conditions within workable ranges. Feedback helps adjust these conditions when the environment changes.

DNA and genes

DNA stores hereditary information. Genes contain information used to make functional products such as proteins or RNA.

Energy transformations

Photosynthesis stores energy in organic molecules, while cellular respiration transfers energy into forms cells can use.

Evolution

Populations change across generations. Natural selection can increase inherited traits that improve reproductive success in a particular environment.

Ecosystems

Organisms interact with each other and their physical surroundings. Matter cycles while energy moves through food webs and is eventually dispersed as heat.

How to prepare

• Review reading tables and line graphs.
• Practice metric units and simple proportions.
• Sketch a cell and label any parts you already know.
• Read your school's lab safety instructions before the first lab.

Study habits that help

• Draw processes from memory and label the arrows.
• Compare paired ideas such as mitosis and meiosis.
• Use a real organism to explain each new concept.
• For every lab, identify the question, variables, and evidence.

What to expect

Typical workload

Moderate

Time outside class

Typically about 3 to 5 hours outside class; labs and school expectations can change this.

Pace

Units usually move across several levels of life, with vocabulary and lab work throughout.

How it is usually graded

Tests, quizzes, lab reports, projects, and homework commonly contribute to grades.

Skills that help

• Observation
• Graph interpretation
• Scientific explanation
• Organized notes

What teachers usually expect

• Follow all lab safety directions.
• Record observations honestly.
• Support explanations with evidence.

Before you start

• General middle school science skills
• Basic graphing and arithmetic
• Reading short informational passages

These are general descriptions of a typical course. Workload, pace and prerequisites differ by school and instructor, so check with your counselor, advisor or the course catalog.

Where it can lead

• Biology
• Environmental science
• Nursing
• Public health
• Agriculture

Flashcards

Practice questions

Vocabulary

Organelle

A specialized structure within a cell.

Genotype

An organism's genetic makeup at specified genes or more broadly.

Phenotype

An observable trait influenced by genes and environment.

Mutation

A change in a DNA sequence.

Population

Members of one species living in a defined area.

Biodiversity

The variety of life at genetic, species, and ecosystem levels.

Control group

A comparison group used to help evaluate a treatment's effect.

Cellular respiration

Processes that transfer energy from fuel molecules into usable cellular forms, including ATP.