How to Study for Biology in College: A Weekly Routine and Unit-by-Unit Practice

Intro biology covers a lot of ground fast: the chemistry of life, cells and membranes, how cells capture energy, cell division, genetics, gene expression and evolution. The vocabulary alone can fill a stack of flashcards. But exams also ask you to explain a process, predict what happens when one step fails, and make sense of a graph, and flashcards alone don't train that.

This guide covers how to study for biology in college: what the course usually includes, the kinds of questions to expect, a weekly routine built on learning research, where to practice each unit for free, and how to prepare for multiple-choice, short-answer and lab practical exams. Exam in a day or two? Skip to the short version.

What intro biology covers

The typical introductory course for biology majors runs two semesters. That's the scope OpenStax wrote its free Biology 2e textbook for. Here's how three colleges divide the material:

• Texas A&M: BIOL 111 covers the chemical basis of life, the cell, molecular biology and genetics. The second semester moves to evolution, the history and diversity of life, and how organisms are built and function.
• UT Austin: Introductory Biology I introduces energy transformation, cell structure and physiology, and gene expression, and leaves inheritance, evolution, physiology and species interactions for the second course.
• UNC-Chapel Hill: BIOL 101 is a single-semester introduction to cell structure, chemistry and function, genetics, evolution, adaptation and ecology, and it's the prerequisite for most of the department's higher courses.

Labs vary. Texas A&M builds three lab hours a week into each semester, while UNC pairs BIOL 101 with a separate one-credit lab.

Chemistry runs through the whole course, from bonds and water in the first unit to the redox reactions of respiration and photosynthesis, and the College Board recommends a high school chemistry course before AP Biology. If you're taking organic chemistry alongside biology, our guide on how to study for organic chemistry covers that course.

In OpenStax's table of contents, the first 17 chapters start with the study of life and its chemistry (bonds, water, macromolecules), then move through cell structure, membranes, metabolism, cellular respiration, photosynthesis, cell communication and cell division, then meiosis, inheritance, DNA, gene expression and biotechnology. Chapters 18 through 47 cover evolution, the diversity of life, plants, animals and ecology. Your syllabus decides the order at your school, so treat it as the master list.

If you took AP Biology, much of this will look familiar. The College Board lists the course's college equivalent as a two-semester introductory biology course for majors, taught in eight units from the chemistry of life to ecology. That's why this guide points to Lykke's free AP Biology course for practice: its 67 sections follow those eight units topic by topic, and AP courses cover introductory college-level material.

What biology exams test besides vocabulary

Vocabulary still matters. When researchers rated 9,713 exam and quiz questions from 77 introductory biology courses, 93% tested knowledge or comprehension, the two lowest levels of Bloom's taxonomy (Momsen et al., 2010). That makes the terms necessary, but not the whole job: comprehension questions ask you to describe a process in your own words, which a list of definitions won't give you. And the higher-level questions are where points go missing. In an upper-division physiology course that tracked scores by question level, students earned 80% of the knowledge-level points on the first exam but only 55% of the application-level points (Crowe et al., 2008).

The AP Biology exam leans further toward application. Some of its 60 multiple-choice questions come in sets, typically four or five, that share one stimulus such as a data table or a diagram, and each of its six free-response questions asks you to interpret an experiment, analyze data, work with a model or predict the effect of a change (College Board).

Find out what your exam rewards

In that physiology course, students sorted every question on the previous year's exam by level and added up the points at each level, which let them adjust their studying to match. You can do a quick version with any old exam or practice set your professor posts:

If most of the points sit in the bottom three rows, flashcards should be a small slice of your week.

How to study for biology: five methods that work

Evidence from an actual biology classroom points to active studying. In a 623-student intro biology course, students who quizzed themselves, explained concepts or worked problem sets earned exam scores 4.0% to 7.7% higher on average than classmates who didn't, with prior preparation and total study time held equal (Walck-Shannon et al., 2021). In that course, starting earlier didn't predict higher scores on its own; what students did in their sessions did.

1. Draw each process from memory

Pick the process of the week (cellular respiration, photosynthesis, DNA replication, meiosis, a signaling pathway) and draw it on a blank page with your notes closed: every stage in order, where in the cell it happens, and what goes in and comes out. Check it against the textbook figure, then redraw only the parts you got wrong. Two days later, draw it again from scratch.

This is retrieval practice in picture form, and it trains the skill exams test: producing a process, not recognizing it. Interactive models help you check the moving parts. The free chemiosmosis demo shows a proton gradient across a membrane driving ATP production, the step respiration and photosynthesis share, and the DNA replication demo lets you unzip the replication fork yourself.

2. Build concept maps with the book closed

A concept map links terms with labeled arrows: glucose → broken down in → glycolysis → produces → pyruvate, ATP and NADH. Build one per chapter from memory, then fill the gaps from your notes in a different color, so you can see exactly what you didn't know. In one study, students who built concept maps from memory did better on a test a week later than students who restudied the text, and as well as students who wrote out everything they could recall (Blunt & Karpicke, 2014).

Maps also connect units. Link each new topic to earlier ones: the inner mitochondrial membrane from your cells unit is where the electron transport chain runs in the energy unit, and the proteins from your gene expression unit include the enzymes from your metabolism unit.

3. Explain figures before you read the captions

Biology textbooks teach through figures. Cover the caption and explain the figure out loud as if you were teaching it: what each arrow means, what's inside versus outside the cell, what would change if one part were removed. Then read the caption and fix what you missed. Explaining concepts was one of the habits tied to higher scores in the study above. OpenStax's Biology 2e marks core figures with "Visual Connection" questions, and answers to the odd-numbered ones are in its student solution manual.

4. Space out flashcards, and make some about relationships

Terms are worth drilling, and flashcards work better spread out. In a study of vocabulary learning, studying one big stack of flashcards beat splitting the same cards into four small stacks, because each card came back after a longer gap. Spacing won for 90% of participants, yet after the first session 72% believed the small stacks had worked better (Kornell, 2009).

Keep one stack, review it every day or two, and say each answer before you flip. Then make about a third of your cards about relationships rather than definitions: "What happens to the proton gradient if oxygen runs out?" or "Why does a frameshift usually do more damage than a single-base substitution?"

5. Practice with data and experiments every week

Once a week, work through one figure or data set: describe the trend, explain it with a mechanism, and say what experiment would test it. HHMI BioInteractive's Data Points activities are built around figures from published studies. The free AP Biology course's practice sections walk through data-based free-response tasks with worked reasoning, such as interpreting an experiment part by part and explaining an enzyme's response to temperature.

With any simulation, predict before you move a slider. In the enzyme kinetics demo, say what raising the temperature or the activation energy will do to the reaction rate, then check. The Experimental Design Simulator shows how an uncontrolled variable can produce a correlation that isn't real. Spotting that kind of flaw is a standard part of critiquing an experiment.

A weekly biology study routine

How much time? The federal definition of a semester credit hour assumes one hour in class and at least two hours of work outside it each week (34 CFR 600.2). By that yardstick, a 3-credit biology lecture means roughly 6 hours a week on your own, not counting lab. Here is one way to spend them:

With three lectures a week, that comes to about 5.5 hours. Put every exam, quiz and lab practical date in one calendar now (here's how to sync Canvas with Google Calendar). In the two weeks before an exam, switch to the 14-day plan in our midterm guide: more old-exam questions, mixed topics and one timed practice test.

Unit-by-unit biology practice

Use this table as a checklist. The middle column is what you should be able to do on a blank page before the exam, and the links go to free sections and interactive demos where you can practice it.

Every topic section in the free AP Biology course has exam-style multiple-choice questions, and nearly all have an exam-style free-response question with a model answer. Use them after you've drawn the process from memory, so they test you rather than teach you.

If your course goes deeper into molecular genetics, the free Introductory Biology course adds sections on genetic linkage, recombinant DNA and cell signaling, each with its own demo. If the basics feel shaky, start with High School Biology. And if your second semester turns to the human body, Anatomy and Physiology covers the organ systems in four sections.

How to study for each kind of biology exam

Multiple choice

Answer the question in your head before you read the options; for an experiment question, write your prediction in the margin first. When several questions share one graph or table, spend the first minute on the figure alone: the axes, the units, and what differs between the groups. Test each tempting option this way: it may be a true statement, but does it answer what was asked?

Short answer and free response

Answer the verb. "Describe" asks what happens, "explain" asks why (usually with a mechanism), and "justify" asks for the evidence. For data questions, use claim, evidence and reasoning: state your answer, cite the numbers that support it, and connect the two with the biology. Label each part so the grader can find it, and don't spend words on parts nobody asked about.

Lab practicals

A lab practical tests whether you can identify and interpret what's on a lab bench. Stations are set up around the room, each with a question, and everyone rotates on a timer. In Duke's general microbiology course, for example, students had 2 minutes per question across 28 stations, identifying structures, naming stains under the microscope and reading biochemical test results (Duke Center for Teaching and Learning).

Practice the way you'll be tested: identify specimens, slides or photos that someone else picked, against a clock set to your course's time per station. For each lab, know the question, the method and what the result means, because a practical can ask what a result tells you, not just what something is called.

If your biology exam is in one or two days

1. Rank topics by points. Use the study guide or old exams to find the three or four biggest topics, and start there.
2. Draw each core process once from memory, check it, and redraw what you got wrong.
3. Do practice questions on those topics and read the explanation for every miss.
4. Run your flashcards for the terms you still miss, and skip rereading the chapter.
5. Sleep. Stop at a normal hour. Our midterm guide explains what an all-nighter does to memory, and its three-day plan is a fuller version of this list.

Common mistakes in intro biology

• Learning the words without the process. Knowing the term "ATP synthase" won't help if you can't say what powers it.
• Recognizing a diagram instead of drawing it. A figure you've seen ten times feels familiar, but the exam asks you to reproduce it or apply it.
• Skipping the graphs. Data questions feel hard, so they're easy to put off, and they only get easier with practice.
• Treating units as separate. Energy, membranes, genes and evolution keep coming back, and a cumulative final will mix them.
• Leaving lab until the practical. Ten minutes after each lab is easier than relearning a semester of specimens the night before.

Free resources for studying biology

• OpenStax Biology 2e: a free textbook, online or as a PDF, written for a two-semester majors course, with review and critical thinking questions at the end of its chapters.
• HHMI BioInteractive: free animations, virtual labs and the Data Points graph activities.
• Khan Academy's AP/College Biology: free videos, articles and practice in the same eight units as AP Biology, with a test for each unit.
• Lykke's free courses: AP Biology, Introductory Biology and High School Biology, each with interactive demos, plus more on Explore.

Using a chatbot to quiz yourself is different from using one on graded work; before you do the second, read your syllabus's AI policy.