Online Biochemistry for PA School: What Counts and What Doesn’t- the rate-limiting prerequisite for career-changers — and the format gotchas that send applicants back to school a second time
Biochemistry has moved from a ‘nice to have’ to a ‘must have’ for PA school applicants. As of the 2026–2027 admissions cycle, roughly 80% of CASPA-listed PA programs require Biochemistry as a prerequisite, up sharply from a decade ago. Programs that historically accepted Organic Chemistry as a substitute have moved toward requiring Biochemistry as a separate course. For career-changers without a science background, Biochem has become the single most common rate-limiter standing between application and admission.
The complication: Biochemistry has more format requirements than almost any other PA prerequisite. Upper-level vs. introductory. Standalone vs. combined with organic. Survey vs. dedicated. Online vs. in-person. Each requirement varies across programs, and getting the wrong format means the course doesn’t count — at all. This guide walks through what CASPA programs actually require, what counts, what doesn’t, and how PrereqCourses.com delivers Biochemistry as a 3-credit upper-level course through Upper Iowa University.
| AT A GLANCE• Required at roughly 80% of CASPA-listed PA programs (up from ~50% a decade ago)• Typical requirement: 1 semester (3 credits) of upper-level (300/400-level) Biochemistry• Combined organic + biochem courses NOT accepted at many programs (Case Western, ECU, others)• ‘Survey of Biochemistry’ and other overview courses NOT accepted at many programs• Organic Chemistry is typically a prerequisite for Biochemistry itself• FSU explicitly notes Biochemistry performance receives ‘particular attention’ in admissions review |
Three things have happened to Biochemistry’s role in PA admissions over the past decade:
Programs that historically listed Biochemistry as ‘strongly recommended’ have moved it to the ‘required’ list. ECU’s PA program is a clear recent example: Biochemistry will be a required prerequisite beginning with the 2026–2027 admissions cycle, with one semester of upper-level Biochemistry (minimum 3 semester credit hours), having General or Organic Chemistry as a prerequisite. CUNY made a similar shift for its 2026–2027 cycle. The trajectory across the field is unambiguous.
Many programs that once accepted ‘Organic Chemistry OR Biochemistry’ as a single requirement have separated them into two distinct prerequisites. Case Western states this plainly: applicants must take 1 organic chemistry course with lab AND 1 biochemistry course; the two cannot be combined. This change effectively adds a full course to the prerequisite stack for any applicant who previously planned to take only one.
Programs have tightened what ‘Biochemistry’ means. Survey courses don’t count. Combined organic-biochem courses don’t count at many programs. Introductory biochemistry sometimes counts and sometimes doesn’t. The format question — once a footnote — is now central to whether your transcript clears the prerequisite at all.
| FOR CAREER-CHANGERS, THIS IS THE BOTTLENECKIf you’re a career-changer applying to PA school from a non-science undergrad, Biochemistry typically requires you to first complete General Chemistry I & II AND Organic Chemistry I as prerequisites to the Biochem course itself. That’s potentially three courses (Gen Chem I, Gen Chem II, Orgo I) before you can even enroll in Biochemistry. This sequence is the most common reason career-changers underestimate their PA application timeline. Plan 12–18 months for the full chemistry stack if you’re starting from scratch. |
Biochemistry requirements vary on three dimensions: the level of the course, whether it must be standalone or can be combined with another subject, and what the prerequisites to the course are.
Most CASPA programs require Biochemistry at the upper-division level — typically a 300-level or 400-level course at a four-year institution. ECU specifies upper-level Biochemistry with a minimum of 3 semester credit hours. The reason is academic: lower-division survey biochemistry doesn’t cover the depth of metabolism, enzyme kinetics, and macromolecular structure that PA programs assume.
This is where many applicants stumble. Some institutions offer combined organic-biochemistry courses, often titled ‘Bio-Organic Chemistry’ or similar. Case Western explicitly states that ‘combined organic chemistry with biochemistry will not fulfill the requirements.’ NYIT lists Bio-Organic Chemistry as not acceptable. A Case Western admissions director put it this way: ‘we accept either undergraduate or graduate level courses for biochem and organic but they must be separate courses and they must be specific to biochem and organic, not overview courses that combine lots of different topics.’
The exception: Michigan State University’s PA program will accept a combined organic and biochemistry course IF at least 50% of the course is biochemistry-focused. Few programs offer this flexibility — most expect a dedicated Biochemistry course on the transcript.
Biochemistry itself has prerequisites. At most regionally accredited institutions, you can’t enroll in Biochemistry without first completing General Chemistry and Organic Chemistry. ECU’s requirement language is typical: upper-level Biochemistry with ‘General or Organic Chemistry as a prerequisite’ is required. For career-changers planning their sequence, this matters: you can’t shortcut into Biochem without the chemistry foundation underneath it.
Before you enroll in any Biochemistry course, run it through this filter:
| WHAT COUNTS | WHAT DOESN’T COUNT |
|---|---|
| Upper-level (300/400) Biochemistry — standalone course, 3+ credits | Combined organic-biochemistry courses (‘Bio-Organic Chemistry’) |
| Biochemistry I (CHEM 330 or equivalent) at a regionally accredited four-year institution | ‘Survey of Biochemistry’ or similar overview courses |
| Cell Biochemistry (accepted at NYIT, some other programs) | Organic Chemistry alone (does NOT substitute for Biochemistry at most programs) |
| Letter-graded Biochemistry from regionally accredited online programs (most programs) | Biochemistry courses without prerequisites in Gen Chem/Organic at most institutions |
| Undergraduate or graduate-level Biochemistry (Case Western and others accept both) | AP credit (rarely accepted for Biochemistry) |
| THE TWO COSTLIEST MISTAKES1. Taking a combined organic-biochemistry course (often listed as ‘Bio-Organic’ or ‘Organic Chemistry with Biochemistry’) and assuming it satisfies the Biochemistry prerequisite. At many programs (Case Western, NYIT, others), it satisfies neither requirement cleanly. 2. Taking introductory or survey biochemistry when the program requires upper-level. The level designation on your transcript is the first thing CASPA verifies. |
Here’s a sampling of how eight CASPA programs handle Biochemistry, organized by strictness:
| Program | Required? | Level / Format | Key Notes |
|---|---|---|---|
| ECU | Required (2026–2027) | Upper-level, 3+ credits | Survey and combined discipline courses NOT accepted; needs Gen or Org Chem prereq |
| Case Western | Required | Standalone Biochem course | Combined organic+biochem courses NOT accepted; undergrad OR grad-level OK |
| CUNY | Required (2026–2027) | Standalone Biochem | Now required separately alongside Organic Chem I with lab |
| FSU | Required | Standard format | Admissions committee gives ‘particular attention’ to Biochem grade performance |
| NYIT | Required | Intro level or above | Cell biochemistry acceptable; Bio-Organic Chemistry NOT acceptable; online OK |
| Boston University | Required | In-person or hybrid only | Cannot count toward upper-level biology requirement if taken at 300/400 level |
| MSU PA Medicine | Required | Standalone preferred | Will accept combined organic+biochem IF 50%+ is biochem-focused (rare exception) |
| Slippery Rock | Highly recommended | Upper-level bio OR biochem | One of the few programs where it remains recommended rather than required |
| VERIFY BEFORE YOU ENROLLBiochemistry requirements have changed substantially across multiple programs in the 2026–2027 cycle. Pull each target program’s official admissions page before enrolling. Boston University’s restriction on online coursework for Biochemistry is particularly important to catch — many career-changer-friendly online options would not satisfy BU’s requirement. |
The post-2020 shift toward accepting online prerequisites has reached Biochemistry at most CASPA programs. NYIT explicitly notes online courses are acceptable. ECU, CUNY, Case Western, and others accept online Biochemistry from regionally accredited institutions. The exception is a handful of programs — Boston University being the most prominent — that still require in-person or hybrid only for science prerequisites.
Biochemistry is conceptually dense. Metabolic pathways (glycolysis, the citric acid cycle, oxidative phosphorylation), enzyme kinetics, protein folding, and nucleotide biochemistry are each substantial topics that benefit from time to absorb. Self-paced format lets you move quickly through familiar territory (basic biochem energetics if you’ve done physics) and slow down for the harder material (regulation of metabolism, signal transduction). A traditional fixed-pace classroom runs everyone through both at the same speed.
Self-paced online Biochemistry through a four-year university partner costs $675 at PrereqCourses.com. The same course at a state university online program typically runs $1,500–$3,000. Post-baccalaureate biochemistry as part of a structured pre-PA program runs $5,000+ when amortized across the program. For applicants who only need the single course (which is most career-changers in this position), the standalone online format is dramatically more cost-efficient.
PrereqCourses delivers Biochemistry through Upper Iowa University, a regionally accredited four-year institution accredited by the Higher Learning Commission. The course (CHEM 330) appears on a four-year university transcript at the upper-division level — the format that satisfies the strictest CASPA programs.
CHEM 330 Biochemistry I is delivered as a fully self-paced 3-credit upper-division course through Upper Iowa University. The course covers the standard biochemistry curriculum: protein structure and function, enzymology, carbohydrate and lipid biochemistry, nucleic acids, and the major metabolic pathways.
CHEM 330 requires CHEM 251 Organic Chemistry I as a prerequisite. Most applicants will also have completed CHEM 151 General Chemistry I and CHEM 152 General Chemistry II earlier in their academic sequence. If you’re starting from scratch on chemistry, plan the full sequence: Gen Chem I → Gen Chem II → Organic Chem I → Biochemistry I. Total time at self-paced: roughly 8–12 months.
View CHEM 330 Biochemistry I course details or contact an academic advisor to confirm it satisfies your target programs’ Biochemistry requirements.
You almost certainly need the full chemistry stack: Gen Chem I + II → Organic Chem I → Biochemistry I. Plan 12–18 months at a steady self-paced pace. Start with CHEM 151 General Chemistry I and work through the sequence. Don’t try to skip Organic Chemistry — most institutions (including UIU) will not let you enroll in Biochem without it, and PA programs assume you’ve completed the foundation underneath your Biochem credit.
You’re the cleanest case. If you’ve already completed Organic Chemistry I (and have it on your transcript), you can enroll directly in CHEM 330. Plan 10–16 weeks for completion. Most applicants in this scenario clear Biochem inside a single semester and apply with the requirement satisfied.
Map the course against your target programs carefully. Programs like Case Western, NYIT, and ECU will not accept combined courses for the Biochem prerequisite. If any of your target programs falls in this category, you’ll need to take a standalone Biochemistry course — your combined course may satisfy the Organic Chemistry requirement at some programs, but rarely both. This is one of the most common reasons applicants need a ‘cleanup’ Biochemistry course before applying.
Check whether your target programs require upper-level Biochemistry specifically. ECU explicitly excludes survey courses. If even one of your target programs requires upper-level (300+), you’ll need to retake at the upper-division level. CHEM 330 is a 300-level course and satisfies upper-division requirements.
Recency rules for Biochemistry vary. Some programs apply a 5- or 10-year recency rule to science prerequisites. Others don’t. If your Biochem grade is from a decade-plus ago, check each target program’s recency policy. The combination of an old grade and an evolving curriculum (modern biochemistry covers signal transduction and molecular biology in ways earlier courses didn’t) makes retaking a stronger choice than the recency rule alone might suggest.
Here’s how the realistic paths to completing Biochemistry compare:
| Option | Typical Cost | Time to Complete | Level | PA School Acceptance |
|---|---|---|---|---|
| PrereqCourses / UIU (CHEM 330) | $675 | 10–16 weeks | 300-level (upper) | Accepted at most CASPA programs |
| Community college Biochemistry | $300–$900 | 16 weeks | Often lower-division | May fail ‘upper-level’ requirement at strict programs |
| State university (online) | $1,500–$3,000 | 16 weeks | Upper-division | Accepted at most CASPA programs |
| Post-baccalaureate program | $20,000–$50,000 total | 1–2 years | Upper-division | Strong reputation; high cost |
Note the community college caveat: most community college biochemistry courses are introductory or lower-division. They satisfy programs that accept introductory Biochemistry but not programs requiring upper-level. For an applicant building toward the strictest programs (ECU, Case Western, CUNY), the four-year university online option is the safer choice.
Biochemistry falls under CASPA’s Chemistry course classification at most institutions. This means it counts toward your science GPA, your BCP GPA (Biology, Chemistry, Physics), and — at programs that include it in their prerequisite list — your prerequisite GPA. As Tufts’ admissions page notes, Biochemistry is included under their Chemistry subject code unless the granting institution categorizes it as a biology course on the transcript. A strong grade in Biochemistry directly improves your BCP GPA — which competitive programs in 2026–2027 are looking to be 3.5 or higher.
| BIOCHEMISTRY GRADES GET EXTRA SCRUTINYFlorida State University’s PA admissions page states explicitly that the admissions committee gives ‘particular attention to organic chemistry and biochemistry undergraduate courses’ when reviewing applications. Other programs apply similar informal weight even when they don’t say so on their website. A B+ in Biochem signals one thing to admissions committees; a C signals another. Plan your effort accordingly. |
Biochemistry is the prerequisite most often left in-progress at application submission, simply because it sits at the end of the chemistry sequence and many applicants are still completing it during the spring/summer of their application year. Most CASPA programs allow Biochem to be in-progress as long as it completes by a stated deadline (often September 1 to December 31). Read each target program’s policy on outstanding prerequisites carefully.
At most CASPA programs in 2026–2027, no. Programs that once allowed this substitution have largely moved away from it. Duke explicitly states they cannot substitute Biochem for Organic, and the inverse is becoming equally true across the field. Plan to take both courses separately.
Almost never. Biochemistry is its own discipline at the upper-division level, and AP credit at the introductory level doesn’t substitute. If your transcript shows AP credit that was applied toward Biology or Chemistry, you’ll still need a dedicated Biochemistry course.
At the majority of programs, yes. NYIT explicitly states online courses are acceptable. ECU, CUNY, Case Western, and many others accept online Biochemistry from regionally accredited institutions. The exception worth flagging: Boston University requires science prerequisites to be in-person or hybrid only — an outlier policy that does still exist.
Usually not for the PA prerequisite. Lab is sometimes required for Organic Chemistry but rarely for Biochemistry at PA programs. Some programs prefer a lab if one is offered; some don’t address it. Online Biochemistry without lab is acceptable at most programs.
Biochemistry is conceptually denser than most undergraduate science courses, but it’s also more cohesive — every topic builds on the central themes of macromolecule structure and metabolic energy. Applicants who succeeded in Organic Chemistry typically succeed in Biochem. The challenge is sustained focus over a 10–16 week period rather than peak difficulty in any single concept.
Most CASPA programs require a minimum of C in each prerequisite. But because Biochemistry gets disproportionate weight in admissions review at programs like FSU — and because it counts toward your BCP GPA — a grade of B or higher is what competitive applicants target. A strong Biochem grade is a recent, prominent data point on your transcript.
If Biochemistry is on your target programs’ prerequisite list — and at roughly 80% of CASPA programs, it is — clearing it is one of the most important moves you can make for your application. The format gotchas matter more here than for any other prerequisite, so verify before you enroll.
| CLEAR THE PA RATE-LIMITEREnroll in CHEM 330 Biochemistry I today at PrereqCourses.com. $675, 3 credits, upper-division (300-level), fully self-paced, transcripted by Upper Iowa University (regionally accredited four-year institution). The format that satisfies the strictest CASPA programs — including ECU, CUNY, Case Western, and others — at a fraction of the cost of state university or post-baccalaureate programs. |
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