A common structure for scientific papers and lab reports: Introduction, Methods, Results, Discussion. It organizes the story from question to interpretation.

A brief summary (often 150–250 words) of the entire study, including background, methods, key results with numbers, and main conclusion.

Writing style that is clear, objective, precise, and cautious about claims; avoids slang and emotional language while remaining readable.

Part of a report that describes what was done in enough detail for another scientist to repeat the study, usually in past tense.

Section that presents what was found, often with tables and figures, focusing on patterns and statistics rather than interpretation.

A standard structure for scientific reports: Introduction, Methods, Results, Discussion.

The section that explains how the study was conducted, including materials, procedures, and analysis.

The section that reports the findings of the study, often using tables, figures, and statistics.

A concise summary of a scientific study, usually 150–250 words, covering background, methods, key results, and conclusion.

Writing Like a Biologist: Lab Reports and Abstracts — BIO 204: Fundamentals of Scientific Inquiry in the Biological Sciences

Step 1: From Experiment to Scientific Story

From Data to Story

You have data from a biology lab. How do you turn it into a scientific story that looks and sounds like a real journal article? This module focuses on writing lab reports and abstracts like a biologist.

IMRaD Overview

IMRaD = Introduction, Methods, Results, Discussion. Introduction: question and importance. Methods: what you did. Results: what you found. Discussion: what it means biologically.

Skills You Will Practice

You will outline a report using IMRaD, write in clear, objective, concise style, and craft an abstract that summarizes purpose, methods, key results, and conclusions.

Link to Previous Modules

You already learned to turn raw data into graphs and stats, and to read primary articles. Now you switch roles: from reader to author of a biological story.

Step 2: Anatomy of a Biology Lab Report (IMRaD + Extras)

Typical Structure

A biology lab report usually follows: Title, Abstract, Introduction, Methods, Results, Discussion, References. Some courses merge sections, but the IMRaD logic is the same.

Title and Abstract

Title: specific and informative, not cute. Include organism, key variable, and outcome. Abstract: 150–250 word mini-paper with question, brief methods, key results, and main conclusion.

Introduction and Methods

Introduction moves from broad topic to specific question or hypothesis. Methods describe what you did in enough detail to repeat it, in past tense, without copying the lab manual.

Results and Discussion

Results: what you found, with figures and tables, but minimal interpretation. Discussion: what the results mean biologically, how they fit literature, and what limitations and next steps exist.

References

References list only sources cited in the text, using a consistent style (APA, CSE, or journal style). This mirrors how current biology journals format their articles.

Step 3: A Running Example Experiment

Our Example Lab

We will use one realistic example throughout: an enzyme activity lab on catalase in yeast at different temperatures. This will anchor the IMRaD sections and the abstract.

Question and Hypothesis

Question: How does temperature affect the rate of H2O2 breakdown by yeast catalase? Hypothesis: Activity increases up to an optimal temperature, then decreases due to enzyme denaturation.

Methods Snapshot

You mixed yeast suspension with 3% H2O2 at 10, 25, 37, and 55 °C, measured O2 produced in 60 s, repeated each condition 3 times, and calculated mean ± SD.

Imaginary Results

Results: 10 °C: 1.2 ± 0.2; 25 °C: 3.8 ± 0.4; 37 °C: 5.9 ± 0.3; 55 °C: 0.9 ± 0.1 mL O2 / 60 s. A graph shows temperature on x-axis and O2 volume on y-axis, with a peak at 37 °C.

How We Will Use It

We will use this scenario to sketch each IMRaD section and then assemble a full abstract that mirrors current biology journal style.

Step 4: Outline Your IMRaD Structure

Use this step to outline a lab report for either the enzyme example or your own recent lab.

Task A: Match questions to sections

For each question, decide which IMRaD section it belongs to:

"What did we already know about catalase and temperature before this lab?"
"How many replicates did we run at each temperature?"
"Did catalase activity differ significantly between 25 °C and 37 °C?"
"Why might activity drop at 55 °C?"

Think it through before checking:

Introduction
Methods
Results
Discussion

Suggested answers (do not peek until you decide):

Introduction
Methods
Results
Discussion

Task B: Draft a one-line outline for each section

Pick either:

The enzyme experiment from Step 3, or
A lab you recently completed.

Write one sentence for each section:

Introduction: "In this report, I will investigate ... because ..."
Methods: "We measured ... by ... under these conditions ..."
Results: "We found that ... (mention direction of change and key pattern)."
Discussion: "These results suggest that ... and may be explained by ..."

Keep these sentences. You will refine them into full paragraphs in later steps.

Reflect:

Which section feels easiest to outline right now? Which feels hardest?
This can guide where you spend extra time when writing your next report.

Step 5: Writing in Clear, Objective, Scientific Style

Clarity Over Formality

Current biology writing values clarity more than stiff formality. Your lab reports should be readable yet precise, mirroring how modern journals are written.

Tense and Person

Use past tense for what you did and present tense for general facts. Many guides allow "we" for clarity, but follow your course rules about first person.

Be Quantitative

Use specific numbers: "5.9 ± 0.3 mL" instead of "much faster". Quantitative, precise language is central to biological writing.

Neutral, Careful Tone

Avoid casual or emotional phrases like "messed up". Describe issues neutrally and be cautious with certainty: say "suggest" rather than "prove".

Refer to Figures

Connect text to visuals: "As shown in Figure 1, oxygen production increased from 10 °C to 37 °C and then declined at 55 °C." This helps readers follow your story.

Step 6: Sample IMRaD Paragraphs for the Enzyme Lab

Intro Example

The sample Introduction moves from general enzyme concepts to catalase and temperature, then states the experiment and hypothesis clearly in the final sentences.

Methods Example

The Methods excerpt describes organisms, solutions, volumes, temperatures, timing, replication, and analysis, in past tense and enough detail to repeat.

Results Example

The Results paragraph reports numeric means ± SD, describes the pattern, mentions the ANOVA result, and refers to Figure 1, but does not explain why yet.

Discussion Example

The Discussion interprets the pattern, links to prior work, proposes mechanisms, considers alternatives, and suggests a future experiment, all in a cautious tone.

Big Picture

Each section has a distinct job, but together they form a coherent biological story: from question and design to evidence and interpretation.

Step 7: Check Your Understanding of IMRaD and Style

Answer this question to test your grasp of IMRaD roles and scientific tone.

Which sentence is MOST appropriate for the **Results** section of the enzyme lab report?

These findings suggest that catalase may denature at 55 °C, which is consistent with previous studies on enzyme stability.
We mixed yeast and hydrogen peroxide at four temperatures and measured the oxygen produced using a gas syringe.
Oxygen production increased from 1.2 ± 0.2 mL at 10 °C to 5.9 ± 0.3 mL at 37 °C and then decreased to 0.9 ± 0.1 mL at 55 °C (Figure 1).
We were surprised that the 55 °C condition did not work as well as we expected, probably because we made errors in setting up the water bath.

Show Answer

Answer: C) Oxygen production increased from 1.2 ± 0.2 mL at 10 °C to 5.9 ± 0.3 mL at 37 °C and then decreased to 0.9 ± 0.1 mL at 55 °C (Figure 1).

Option 3 is best for Results: it reports specific quantitative findings and refers to a figure without interpreting causes. Option 1 interprets and compares to literature (Discussion). Option 2 describes procedures (Methods). Option 4 is informal and focuses on personal reaction and error (better reframed neutrally in Discussion or Limitations).

Step 8: Writing Effective Abstracts (Structure and Strategy)

What an Abstract Does

An abstract is a compressed version of your whole paper: background, methods, key results with numbers, and main conclusion, usually in 150–250 words.

Typical Abstract Structure

Most biology abstracts: 1) background/question, 2) methods overview, 3) key quantitative results, 4) main conclusion and significance, in that order.

Enzyme Lab Abstract

The example abstract states the question, briefly describes the catalase assay, reports key oxygen volumes and ANOVA p-value, and ends with a conclusion about optimal temperature.

What to Avoid

Avoid citations, figures, and undefined abbreviations in abstracts. Focus on the core story: what you asked, how you tested it, what you found, and what it means.

Step 9: Draft or Improve Your Own Abstract

Now practice writing an abstract for either the enzyme lab or your own experiment.

Option 1: You have not written an abstract yet

Use this 4-sentence template, then expand to ~150–200 words:

Background / question: "[Broad topic] is important because ... We investigated [specific question] in [organism/system]."
Methods overview: "We measured [response variable] by [basic method] under [key conditions]."
Key results: "[Main pattern with 1–2 numbers], and [statistical result if available]."
Conclusion: "These results indicate that [main conclusion] and suggest that [brief biological implication]."

Option 2: You already have a draft abstract

Revise it by checking:

Does the first sentence clearly state the biological topic and question?
Does the methods sentence mention the organism, what you measured, and key treatments?
Do you include at least one specific number (mean, range, or percent change)?
Do you mention the main statistical test or p-value if you used one?
Does the final sentence state a clear conclusion in present tense?

Mini self-check (answer yes/no):

If someone read only my abstract, would they know:
What question I asked?
What organism/system I used?
What main pattern I found (with numbers)?
What conclusion I drew?

If you answered "no" to any, revise until every answer is "yes".

Step 10: Key Terms Review

Use these flashcards to reinforce core terms from this module.

IMRaD: A common structure for scientific papers and lab reports: Introduction, Methods, Results, Discussion. It organizes the story from question to interpretation.
Abstract: A brief summary (often 150–250 words) of the entire study, including background, methods, key results with numbers, and main conclusion.
Scientific tone: Writing style that is clear, objective, precise, and cautious about claims; avoids slang and emotional language while remaining readable.
Methods section: Part of a report that describes what was done in enough detail for another scientist to repeat the study, usually in past tense.
Results section: Section that presents what was found, often with tables and figures, focusing on patterns and statistics rather than interpretation.
Discussion section: Section that interprets the results, connects them to existing literature, addresses limitations, and suggests implications or future work.
Quantitative language: Use of specific numbers (means, standard deviations, percentages, p-values) instead of vague terms like "higher" or "a lot".

Key Terms

IMRaD: A standard structure for scientific reports: Introduction, Methods, Results, Discussion.
Methods: The section that explains how the study was conducted, including materials, procedures, and analysis.
Results: The section that reports the findings of the study, often using tables, figures, and statistics.
Abstract: A concise summary of a scientific study, usually 150–250 words, covering background, methods, key results, and conclusion.
Discussion: The section that interprets the results, explains their biological meaning, and relates them to other research.
Scientific tone: A writing style that is clear, objective, precise, and avoids slang or emotional language.
Quantitative language: Language that uses specific numerical values and statistics to describe data and patterns.