Tennessee Biology I TNReady EOC: complete guide to the Tennessee Academic Standards for Science, the four life-science core ideas, the item types, and the four performance levels

The Tennessee Biology I End-of-Course (EOC) assessment is the statewide high school biology test in the TNReady program, part of the Tennessee Comprehensive Assessment Program (TCAP) and administered by the Tennessee Department of Education (TDOE). It measures the Biology I standards (the BIO1 codes) in the Tennessee Academic Standards for Science. This page is the index: it explains the item types, the four life-science core ideas, the format and scoring, and how to study each content area. The content is organized here into six modules that cover all of the Biology I standards in depth.

What the Tennessee Biology I EOC is

The Biology I EOC is one of Tennessee's TNReady end-of-course assessments, taken when a student finishes the matching course. It is built on the Tennessee Academic Standards for Science for Biology I, adopted in the 2016 standards-revision cycle and used statewide. Those standards are three-dimensional: every standard is written as a performance expectation that blends a disciplinary core idea (the content), a science and engineering practice (such as developing a model or constructing an explanation), and a crosscutting concept (such as structure and function, or energy and matter).

Most students sit the Biology I EOC in 9th or 10th grade, in a state testing window, with retake opportunities for students who need to test again. The score counts toward the student's final course grade (see below), so the Biology I EOC is part of the report card as well as a school accountability measure.

The item types

The Biology I EOC is computer-based, delivered online in the TCAP platform, and every item is machine-scored. There is no essay or written short-answer section on the science EOC. Two item types appear:

• Multiple choice. A question with four answer options and exactly one correct answer.
• Technology-enhanced items (TEIs). Items that use the computer to collect a response in a richer way. Common TEI formats are drag-and-drop (place labels on a diagram or match terms), multi-select (choose every correct answer, with the prompt telling you how many), ordering or sequencing (put steps in the right order), table completion, and hot spot (click a region of an image). A multi-select is usually scored all-or-nothing, so read how many answers it wants.

Because the test is on a computer, many items pair the question with a stimulus: a data table, a graph, a labeled diagram (a cell, a food web, a pedigree, a Punnett square), or a short passage. The skill the EOC rewards is not just recall; it is reading the stimulus and reasoning from it to the correct response, exactly as the three-dimensional standards intend.

Format and scoring

Your raw score (the number of points you earn) is converted to a scale score for that test form, using an equating procedure so the standard is the same across forms. The scale score places you in one of four TNReady performance levels.

• Below. Performance below the grade-level expectation.
• Approaching. Performance approaching the grade-level expectation.
• On Track. Performance that meets the grade-level expectation (this is the level that shows readiness).
• Mastered. Performance that exceeds the grade-level expectation.

The blueprint mixes a small number of unscored field-test items in with the scored items to develop future tests. You cannot tell which is which, so answer every question carefully.

Does the EOC count toward your grade?

Yes. Tennessee state law requires the EOC to count as a percentage of the final course grade. The local school board sets the exact percentage within a state-allowed range of no less than 15 percent and no more than 25 percent, so the share differs by district. Because of this, the Biology I EOC directly affects the grade you earn for the course, and it is worth treating as a major assessment rather than a practice test.

The four life-science core ideas

The Biology I standards are organized under four disciplinary core ideas from life science. This library mirrors them as six modules so each content area gets the depth the test demands.

LS1: From Molecules to Organisms (Structures and Processes)

The largest content area: cell theory and cell types, the organelles and how structure suits function, the cell membrane and transport, the cell cycle and cell division, the macromolecules and enzymes, photosynthesis, cellular respiration, and how feedback keeps an organism's internal conditions stable. This library splits LS1 across Module 1, Module 2, and Module 6.

LS2: Ecosystems (Interactions, Energy, and Dynamics)

Energy flow through food webs, the cycling of matter (the carbon and nitrogen cycles), carrying capacity and the factors that limit populations, and how biodiversity supports ecosystem stability and resilience, including human impact. This is Module 5.

LS3: Heredity (Inheritance and Variation of Traits)

DNA structure and replication, protein synthesis, meiosis as a source of variation, Mendelian genetics and probability, how mutations change proteins and traits, and biotechnology. This is Module 3, with meiosis introduced in Module 1.

LS4: Biological Change (Unity and Diversity)

The evidence for common ancestry (anatomical, molecular, and fossil), natural selection and adaptation, how populations change over time, the classification of organisms and phylogeny, and biodiversity. This is Module 4.

The three dimensions, as a study checklist

Because the standards are three-dimensional, it helps to know the science and engineering practices the EOC can turn any topic into: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics, constructing explanations, engaging in argument from evidence, and communicating information. The crosscutting concepts that recur are patterns, cause and effect, scale and proportion, systems and system models, energy and matter, structure and function, and stability and change. Whenever you study a topic, ask how the test could turn it into a model to interpret, a graph to read, or a claim to support with evidence.

How to study the Tennessee Biology I EOC

1. Learn the content, then learn to use it. Master the biology for all four core ideas, but practice applying it: most items give you a stimulus and ask you to do something with it.
2. Practice the science and engineering practices. Get comfortable developing and interpreting models, reading data tables and graphs, completing Punnett squares, and reasoning from evidence to a claim.
3. Drill the technology-enhanced formats. Use online practice items so drag-and-drop, multi-select, ordering, and hot-spot items feel familiar before test day. A multi-select is all-or-nothing, so check how many answers it wants.
4. Connect structure to function and follow the energy. Across cells, organs, and ecosystems, the exam rewards explaining how a structure suits its job and tracing how energy and matter move and change.
5. Treat the EOC as a graded assessment. Because it counts toward your course grade, study for it the way you would for a major exam, not a low-stakes quiz.

The modules, standard by standard

Each topic has a standard-level answer page with worked exam questions and cross-links, plus a deep-dive guide and a quiz. Browse the set at /tn-eoc/biology/syllabus.

Module 1: Cells and transport

cell theory and the types of cells, comparing prokaryotic and eukaryotic cells, cell structure and organelles, the cell membrane and transport, the cell cycle and mitosis, meiosis and genetic variation.

Module 2: Biochemistry and energy

the chemistry of life and water, the macromolecules of life, enzymes and activation energy, photosynthesis, cellular respiration.

Module 3: Genetics and heredity

DNA structure and replication, protein synthesis: transcription and translation, Mendelian genetics and Punnett squares, patterns of inheritance, mutations and genetic variation, biotechnology and genetic engineering.

Module 4: Evolution and classification

the evidence for common ancestry, natural selection and adaptation, speciation and population change, classification and phylogeny, biodiversity and its importance.

Module 5: Ecology and interdependence

energy flow and food webs, the cycling of matter, population dynamics and carrying capacity, ecosystem stability and resilience, human impact on ecosystems.

Module 6: The human body and homeostasis

homeostasis and feedback, levels of organization and body systems, transport and gas exchange in the body, the nervous and endocrine systems, the immune system and disease.

For the official guidance

TDOE publishes the Tennessee Academic Standards for Science, the TCAP and TNReady assessment pages, and the EOC science item-release documents that show the exact look and difficulty of the test. Always study from the current TDOE materials, because the item formats, the performance-level cut scores, and the grade-weighting rule are specific to Tennessee.