- TX PACT 738 is TEA's Life Science: Grades 7-12 Pre-Admission Content Test, administered by Pearson.
- The exam has 125 selected-response questions across five domains within a 3-hour testing session.
- Genetics and Evolution carries the largest domain weight at 27% of the exam.
- Candidates need a scaled score of 240 to pass and can register for testing dates within 170 days.
What TX PACT 738 Actually Means
The number 738 attached to "TX PACT" is a specific exam code assigned by the Texas Education Agency (TEA) to identify one particular content test within the broader Pre-Admission Content Test (PACT) program. In this case, 738 refers to TX PACT: Life Science: Grades 7-12 - the test that verifies whether a candidate has the science content knowledge needed to enter an Educator Preparation Program (EPP) with a focus on secondary life science instruction.
Understanding the meaning of TX PACT 738 requires separating three ideas that often get blurred together: the acronym "PACT," the subject area "Life Science," and the grade band "7-12." Each piece answers a different question about what the test measures and who it is for. If you're just getting oriented, the companion overview at What Is TX PACT 738? covers the basics, while this article focuses specifically on unpacking the name and code.
Breaking Down the Name and Code
TX signals that this is a Texas-specific credentialing tool, not a national exam. PACT stands for Pre-Admission Content Test, a category of exams TEA uses to check subject-matter readiness before candidates are admitted into an EPP or, in some cases, as they seek certain assignments. Life Science names the subject domain being tested, and Grades 7-12 specifies the instructional band the test targets - middle and high school science classrooms. The number 738 is simply the unique test code TEA and Pearson use administratively so that candidates, EPPs, and testing centers are all referring to the exact same exam.
For a more detailed answer to the phrasing question itself, see What Does TX PACT 738 Mean? and What Does TX PACT 738 Stand For?. Those pieces dig into the acronym history and program purpose in more depth than this article does.
Key Takeaway
Every part of "TX PACT 738" is functional, not decorative - it tells you the state, the exam category, the subject, the grade band, and the exact test code, all at once.
The Five Domains Behind the Meaning
Knowing the name is only useful once you understand what "Life Science" actually covers on this exam. TEA organizes the 738 content into five domains, each with its own approximate weight on the 125-question exam:
Domain 1: Nature of Science (20%)
Covers scientific inquiry, experimental design, data interpretation, lab safety, and the philosophy of how scientific knowledge is built and revised.
- Distinguishing hypotheses, theories, and laws
- Evaluating experimental controls and variables
Domain 2: Biochemistry and Cell Biology (13%)
Focuses on molecular-level life processes, from macromolecules to cellular respiration and membrane transport.
- Enzyme function and metabolic pathways
- Cell structure and organelle roles
Domain 3: Genetics and Evolution (27%)
The largest domain by far, covering heredity, molecular genetics, and evolutionary mechanisms - the conceptual backbone of the exam.
- Mendelian and molecular genetics
- Natural selection, speciation, and phylogenetics
Domain 4: Biological Unity and Diversity (20%)
Examines classification, anatomy, and physiology across organism groups, plus comparative structure and function.
- Taxonomy and classification systems
- Organ systems across major taxa
Domain 5: Ecology and Environment (20%)
Addresses ecosystems, energy flow, population dynamics, and human impact on the environment.
- Trophic levels and energy transfer
- Biogeochemical cycles and human environmental effects
Because Genetics and Evolution is weighted highest, its meaning within the exam's structure matters as much as its dictionary definition. A full breakdown of every competency inside each domain is available in the TX PACT 738 Exam Domains 2026: Complete Guide to All 5 Content Areas.
| Domain | Approximate Weight |
|---|---|
| Nature of Science | 20% |
| Biochemistry and Cell Biology | 13% |
| Genetics and Evolution | 27% |
| Biological Unity and Diversity | 20% |
| Ecology and Environment | 20% |
Exam Format and Registration Mechanics
TX PACT 738 is a computer-administered exam delivered through Pearson VUE test centers. Candidates answer 125 selected-response questions, and some unscored field-test items may be mixed in without identification, so every question should be treated as counting. The testing time is 3 hours, with a total appointment window of 3 hours and 15 minutes that includes a 15-minute tutorial and compliance agreement before the clock starts on content.
An on-screen scientific calculator is provided, which matters for quantitative items in domains like Biochemistry and Cell Biology or Ecology and Environment where ratios, rates, or basic calculations may appear. The base exam fee is $106, and testing is available year-round by appointment at Texas locations and select sites nationwide, which gives candidates flexibility to schedule around coursework or EPP deadlines.
For the full registration walkthrough, including deadlines and appointment logistics, see TX PACT 738 Exam Dates 2026: Testing Windows, Deadlines & Scheduling, and for a cost-focused view see TX PACT 738 Certification Cost 2026: Complete Pricing Breakdown.
Who Takes TX PACT 738 and Why
TX PACT 738 exists primarily as a gatekeeping and readiness tool for Educator Preparation Programs, not as a standalone teaching license. Two groups typically take it:
- Candidates seeking admission into or transfer within an EPP that includes secondary life science, especially when their GPA is below 2.5 or they hold fewer than 15 relevant subject-area semester credit hours.
- Candidates in intensive pre-service pathways or pursuing certain charter-school assignments where PACT results are used to confirm content readiness.
Admission or transfer candidates need a bachelor's degree or final-semester standing, along with a TEA ID, before they can register. EPPs are also allowed to layer on additional requirements beyond what TEA mandates, so requirements can vary somewhat by program. The full eligibility picture, including these program-level variations, is laid out in TX PACT 738 Requirements 2026: Eligibility, Prerequisites & How to Qualify.
It's worth repeating: PACT supports program admission. Teaching certification itself is a separate process that comes later, through TEA's certification pathway rather than through this content test alone. If you're mapping out how a passing score fits into your broader career plan, TX PACT 738 Jobs and Is the TX PACT 738 Certification Worth It? Complete ROI Analysis 2026 both address how this exam connects to actual classroom hiring down the line.
Scoring, Passing, and Retake Rules
The passing scaled score for TX PACT 738 is 240. Statewide data for the September 1, 2024 to August 31, 2025 program year showed a best-attempt pass rate of 33% among 101 test takers - a figure worth understanding in context rather than reacting to in isolation, since it reflects first-attempt results across a relatively small statewide cohort. A deeper look at what that number does and doesn't tell you is available in TX PACT 738 Pass Rate 2026: What the Data Shows, and the passing threshold itself is explained further in TX PACT 738 Passing Score 2026: Exactly What You Need to Pass.
If a retake is needed, candidates must wait at least 30 days between exam attempts, and prior results must post to ECOS before scheduling again. Candidates affiliated with an EPP need retest approval from that program before rescheduling. One important nuance: PACT taken for EPP admission or for charter-school assignment purposes is exempt from the standard five-attempt limit, though candidates in intensive pre-service pathways remain subject to that cap. This distinction matters when planning how many attempts you can realistically budget for.
Key Takeaway
Because the 30-day retake gap and ECOS posting requirement both apply, a failed attempt can add over a month to your admission timeline - plan registration dates with that buffer in mind.
Planning Study Time Around the Domains
Given that Genetics and Evolution alone accounts for 27% of the exam - more than double the weight of Biochemistry and Cell Biology - study time should not be split evenly across domains. A weighted approach that mirrors the exam's own emphasis tends to produce better returns than a generic content review.
Genetics and Evolution
- Heredity patterns, molecular genetics, and evolutionary mechanisms first, since this domain carries the most weight
Biological Unity and Diversity, plus Ecology and Environment
- Classification, physiology, energy flow, and population dynamics - each at 20% weight
Nature of Science and Biochemistry and Cell Biology
- Experimental design and cellular processes, closing with the lightest-weighted domain
Full-length review under timed conditions
- Practice pacing across 125 questions within the 3-hour limit, factoring in the on-screen calculator for quantitative items
A structured, week-by-week plan built specifically around these five domains - including which competencies to prioritize inside each one - is available in the TX PACT 738 Study Guide 2026: How to Pass on Your First Attempt. If you're still gauging how much of a lift this exam is compared to other content tests, How Hard Is the TX PACT 738 Exam? Complete Difficulty Guide 2026 walks through that comparison in detail. And for a condensed reference you can review right before test day, the TX PACT 738 Cheat Sheet 2026: One-Page Review of Must-Know Facts compiles the highest-yield facts in one place.
Practicing under realistic conditions matters as much as content review. Working through full-length practice questions on the practice test platform before your appointment helps you get comfortable with the selected-response format and timing constraints, so nothing about the actual test day feels unfamiliar. Many candidates also find it useful to combine that practice with the domain guide above so review time maps directly onto tested competencies rather than general biology topics.
For readers who arrived here specifically wondering what the credential itself entails beyond the name, TX PACT 738 Certification and What Is TX PACT 738 Certification? explain how the content test fits into the larger EPP admission and certification pathway. And if you want a single-page conceptual answer to "what is a TX PACT 738," that exact framing is addressed in What Is A TX PACT 738?.
Frequently Asked Questions
No. PACT supports admission into an Educator Preparation Program by confirming subject-matter readiness. Teaching certification is a separate process handled through TEA after program completion.
738 is the specific TEA test code for Life Science: Grades 7-12. It distinguishes this exam from other PACT subject tests that use different codes, since several credentials share similar naming patterns.
Genetics and Evolution, since it carries the largest weight at 27% of the 125 questions, more than double several other domains.
Candidates must schedule and take the exam within 170 days of registration, so it's worth booking an appointment soon after registering.
You must wait at least 30 days before retaking, and prior results need to post to ECOS first. Affiliated candidates also need EPP retest approval before scheduling again.