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CLEP Exam

CLEP Biology Prep

Pass in 7 days with focused, exam-level practice. Save $1,200+ in tuition.

Pass Guarantee

Pass your CLEP exam or your money back — plus the retake fee.

We'll refund your full subscription and pay your official exam retake fee if you finish the program and still don't pass. No fine print, no hoops.

  • Complete ≥80% of your generated study plan
  • Take at least 3 full-length mock exams with a ≥75 average
  • Submit your exam score within 60 days of the exam date
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💰

$97

Exam Cost

⏱️

78 min

Time

🎓

3-6

Credits

✅

~50/80

Passing

What You'll Study

Unit 1: Molecular and Cellular Biology

cell membrane transportenzyme kineticscellular respirationphotosynthesismitosis vs meiosis stagestranscription and translationDNA mutationsbiomolecules (carbohydrates lipids proteins nucleic acids)viruses and prions

🎓 Khan Academy — specific sub-units

→ Cell structure & transport · Membranes, organelles, transport→ Cellular respiration · Glycolysis, Krebs, ETC→ Photosynthesis · Light + Calvin cycle→ Mitosis & meiosis · Cell division stages→ DNA, transcription, translation · Central dogma

Unit 2: Genetics and Molecular Biology

Mendelian inheritanceDNA replicationgene expressionbiotechnology techniquessex-linked traitslinkage and recombinationpolygenic inheritancemultiple allelesnon-Mendelian inheritance

🎓 Khan Academy — specific sub-units

→ Mendelian genetics · Punnett squares, monohybrid/dihybrid→ Non-Mendelian inheritance · Codominance, incomplete dom, polygenic→ Sex linkage & linked genes · X-linked traits

Unit 3: Evolution and Diversity

natural selectionspeciationphylogeneticsHardy-Weinberg equilibriumgenetic driftadaptive radiationhomology vs analogyconvergent vs divergent evolution

🎓 Khan Academy — specific sub-units

→ Natural selection & evolution · Selection pressures + adaptations→ Speciation & phylogeny · Tree-of-life relationships→ Hardy-Weinberg equation · p²+2pq+q² and allele frequencies

Unit 4: Organismal Biology

plant structure/functionanimal organ systemshomeostasisnervous/endocrine systemsalternation of generations (plant reproduction)embryonic development (cleavage gastrulation neurulation)placental developmentanimal behavior (innate vs learned)

🎓 Khan Academy — specific sub-units

→ Animal physiology & homeostasis · Body systems overview→ Plant biology · Plant structure + reproduction→ Embryonic development · Cleavage, gastrulation, neurulation

Unit 5: Ecology and Population Biology

energy flow and trophic levelsbiogeochemical cyclespopulation growth modelscommunity interactionsbiomes and biome characteristicsecological succession (primary vs secondary)ecological niche (fundamental vs realized)stereotyped vs learned animal behaviorsocial biology (altruism cooperation)

🎓 Khan Academy — specific sub-units

→ Ecology — energy & cycles · Trophic levels, biogeochemical cycles→ Population ecology · Growth models, carrying capacity→ Community & ecosystem ecology · Niches, succession, biomes

About these external resources

Links below point to publicly available third-party study materials (Khan Academy, YouTube creators, Modern States, OpenStax, College Board, etc.). PrepLion does not own, host, or modify this content. We list links as a study aid only — each resource is the property of its respective owner and is subject to their terms of service.

All trademarks, course names, logos, and content remain the property of their respective owners. Khan Academy®, YouTube™, Modern States®, OpenStax®, and CLEP® are trademarks of their respective holders. PrepLion is not affiliated with, endorsed by, or sponsored by any of them. If you are a content owner and would like a link removed, contact contact@preplion.ai.

Linked content may be removed, paywalled, or changed by its owner at any time. We make no warranty as to its accuracy, availability, or suitability for any exam.

Study Guide

Topics, formulas, and key concepts

Flashcards

Spaced-repetition deck

Practice Test

Full-length timed exam

Before you start studying

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Free Resources We Recommend

The best free materials for CLEP Biology. No affiliation, no kickback — just what actually works.

Modern States: Biology

Modern States (College Board partner)

Free full video course. Earn the free CLEP voucher after 70% completion.

OpenStax: Biology 2e

OpenStax (free, peer-reviewed)

Cell biology, genetics, evolution, ecology — full CLEP scope.

Khan Academy: Biology

Khan Academy

Cells, genetics, evolution, physiology.

YouTube: CrashCourse

YouTube

40 episodes covering the full CLEP Biology outline.

Amoeba Sisters YouTube

YouTube (student-endorsed)

Real test-takers credit Amoeba Sisters for genes/enzymes/cell-process clarity. Watch when a Khan video doesn't click.

Peterson's CLEP Biology practice tests

Peterson's (paid, optional)

Multiple paid test-takers reference Peterson's as their final practice. Use only if free options don't get you over the line.

Links open in a new tab. PrepLion has no affiliation with these providers — we just think they're the best free options.

Course Notes

- OpenStax Biology 2e (openstax.org/books/biology-2e): CC BY 4.0 - Khan Academy Biology (khanacademy.org/science/biology) - LibreTexts Biology (bio.libretexts.org): CC BY-NC-SA

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CLEP® is a registered trademark of College Board, which is not affiliated with PrepLion. All practice questions are original content.