Home > Free Essays > Sciences > Biology
Free Biology Essay Examples & Topics

Free Biology Essay Examples & Topics

At one point in your academic career, you have to learn how to write an essay. It is an effective and fast way to evaluate students’ ideas, understanding of the subject, and fluency of their scientific writing. Most instructors will use this method even if you study precise sciences such as physics, math, and biology. Here, we consider the latter in detail.

A biology essay, in a nutshell, is a type of academic paper that focuses on a particular topic of biology. It can discuss animal life, cycles in biology, or a botanic subject. Similarly to any academic essay, you are expected to demonstrate your critical thinking skills. You’ll have to provide relevant evidence to support your perspective.

On this page, you will encounter biology essay examples. They can assist you in nailing down a similar school or college assignment. Yet, first of all, look at our tips prepared by our experts.

Areas of Research for Biology Essays

If you’ve been assigned to write a biology essay, you probably know which area of research you have to choose. However, it might be beneficial to explore other available scopes. It’s useful for both interdisciplinary study and the cases when you are free to pick your area of research. In this section, let’s figure out what you can study in biology.

Here are biological areas of research you should be familiar with:

  1. Cancer Biology studies this type of disease to prevent, detect, diagnose and cure it. The ultimate goal of such biologists is to eliminate cancer.
  2. Cell Biology is a branch that studies the structure, function, and behavior of cells. Here, biologists study healthy and sick cells to produce vaccines, medication, etc.
  3. Biochemistry is an application of chemistry to the study of biological processes on cell and molecular levels. It is a cross-discipline between chemistry and biology. The focus is on the chemical processes of living organisms.
  4. Computation Biology is a study of biological data that develops algorithms and models to understand biological systems. Here, scientists either work for institutions or research for private enterprises.
  5. Genetics is an area that focuses on the study of genes and genetic variations for health benefits. It looks at the way DNA affects certain diseases.
  6. Human Disease is an area within which scientists study different diseases. The field covers cancer, developmental disorders, disease genes, etc.
  7. Immunology is a branch of biology that focuses on immunity. Immunologists look at the way the body responds to viruses as a way to protect the organism.
  8. Microbiology studies all living organisms that are too small for our eye to see. It includes bacteria, viruses, fungi, and other microorganisms.
  9. Neurobiology is the study of the nervous system. Biologists examine the way the brain works and look into brain illnesses.
  10. Stem Cell and Developmental Biology seeks to examine how the processes behind stem cell’s ability transform cells. The biologists in this area use the power of stem cells to model human illnesses.

Tips on Writing a Biology Essay

To write a good biology essay, first, you need to examine the topic well. Then, work out a structured outline to approach it. Sounds familiar? An essay about biology resembles any standard 5-paragraph paper. However, several aspects will be different.

When you’re writing about biology, pay attention to the following features:

  • Introduction. Just as in any other form of academic writing, the first section of your paper introduces the subject. Here, explain why your ideas are relevant to biology as a science.
  • Thesis Statement. The final one or two sentences of the first paragraph should include your original hypothesis and experiment. You will be proving them in the main body. You do not have to include the results as the reader will encounter them later. If you’re struggling with this part, try our thesis generator.
  • Main Body. In this part, write about all the experiments in detail. Often, teachers require to include visual aid to prove your point. For Zoology, Anatomy, Botany, it is pretty easy to find some photos and illustrations.
  • Conclusion. Here, restate your thesis. Reemphasize the most critical aspects described in the main body. You can do it by using our summarizing tool. The goal of this last paragraph is to leave an everlasting impression on the reader.

Thank you for reading our article. We hope you found it helpful. Share it with your class peers who also study biology. Additionally, have a look at the biological essay examples below.

151 Best Essay Examples on Biology

Researching the Genetic Enhancement

One of the challenges that have emerged with the advent of genetic enhancement is the inability to ensure that all people have access to the technology.
  • Pages: 5
  • Words: 1436

The Study of the Constituents of the Brain

The five swellings are the Telencephalon, the Diencephalon, the Mesencephalon, the Metencephalon, and the Myelencephalon". The brain of a human being is in the center of the nervous system.
  • Pages: 3
  • Words: 1255

Unknown Microorganism Report

The presence of circular shape in the morphology part may indicate that the organism may be Xylophilus ampelinus which is a gram negative aerobic cocci.
  • Pages: 2
  • Words: 593

Bacterial Cells and Choice of Antimicrobial Agents

Gram negative bacteria cell wall is made up of the outer membrane, the peptidoglycan, and the plasma membrane. Peptidoglycan in gram negative bacteria unlike in gram positive bacteria is sandwiched between the outer region of [...]
  • Pages: 2
  • Words: 555

Identify the Nature of an Organism by Gram Reaction

Should the cell wall appear pink after staining; then it is a gram-negative bacterium due to its nature of retaining counter stain after the removal of decolorizer and gram-positive if it appears purple, Should the [...]
  • Pages: 2
  • Words: 665

Sleep, Satisfaction With Life and Cognitive Function

Sleep is the state of the mind involving temporary loss of consciousness leading to the resting of the mind. Sleep is one of the most important requirements in individuals so as to ensure the well-being [...]
  • Pages: 6
  • Words: 1630

Psychoactive Substances and Addiction

Substances that could easily lead to addiction are the elements that directly motivate the dopaminergic system such as marijuana, cocaine, nicotine, and heroin.
  • Pages: 4
  • Words: 565

Characteristics of Adult Development

The development entails the changes that are experienced at the various levels of growth from childhood to adulthood. Another influence is the socioeconomic status of an individual.
  • Pages: 4
  • Words: 1311

Pumpkin- A Northwestern Favorite

This is mainly due to the fact that the climatic conditions in the North-Western U.S.are appropriate for the cultivation of pumpkin.
  • Pages: 2
  • Words: 619

Neurotransmitters and Their Importance for Human Body

Neurotransmitters transmit information to adjoining cells such as neurons."Neurotransmitters also operate from the brain and spinal cord to organs of the digestive system, respiratory system, endocrine system, excretory system, etc, and back"."Regulating neurotransmitters in the [...]
  • Pages: 2
  • Words: 563

The Brain: Structure and Functions

This paper is going to describe the major structures of the brain and the functions of each. This part of the brain is composed of cerebellum and the pons.
  • Pages: 2
  • Words: 550

The Physical Self Concept Analysis

Siegelman and Rider also describe the physical growth in terms of proximodistal concept where the internal organs and chest are said to grow faster during the early period of infancy and then the growth spreads [...]
  • Pages: 2
  • Words: 597

The Technology Bioengineered Corn

The further development and distribution of bioengineered corn will provide additional food sources in which to feed the masses of today and future generations of people as well.
  • Pages: 3
  • Words: 850

Cortisol, Its Functions and Measurements

The hypothalamic-pituitary-adrenal axis is a major player in the stress response system and activation of this axis in response to stressors results in the release of adrenaline and glucocorticoids.
  • Pages: 5
  • Words: 1491

Hessel’s Hairstreak Butterfly

To either affirm or reject the hypothesis it is necessary to access the home page of Mass GIS and obtain background information on the Hessel's Hairstreak butterfly and the Juniper Hairstreak as the latter is [...]
  • Pages: 2
  • Words: 569

Mitosis and Meiosis in Onion Root Tip

The metaphase is characteristic of an alignment of chromosomes in a line in the middle of the cells called equator. The paired chromatids separate at the point of centromere during anaphase and move to the [...]
  • Pages: 4
  • Words: 1691

Biologically Programmed Memory

The brain, which carries the memory of the species, is a complex and delicate organ believed to carry the functions of the species.
  • Pages: 6
  • Words: 1796

Psychophysics. General information.

A psychophysical hypothesis, known as the theory of Signal Detectability uses a blend of statistical choice theory together with the idea of perfect observer modeling the sensitivity of the observer to events that are in [...]
  • Pages: 6
  • Words: 1606

Stages of Biological Child Development

Recent studies were discussed with the help of information processing, Vygotsky's Sociocultural Theory, and Ecological Systems Theory, which discuss the influence of the microsystem, the mesosystem, the exosystem, the macrosystem, and an ever-changing system in [...]
  • Pages: 3
  • Words: 1035

A Passion Flower: Properties and Story of Discovery

The foliage and shoots are medically used in the form of antispasmodic, styptic, sudorific, soporific, narcotic, depressant, and vasodilator in addition to being used in the healing of some female complaints.
  • Pages: 2
  • Words: 650

Lifespan Development: Adolescent Psychology

Physical changes occur in the child during the period of adolescence as they hit puberty. It is known as the formal operational period and is the fourth stage in the life of the individual.
  • Pages: 2
  • Words: 524

Meiosis and Splitting of the Dna Into Gametes

Meiosis is the basic process happening in the cells carrying the genetic information about the organism into two cells, while the number of chromosomes in the resulting cells is divided into two equal parts, thus [...]
  • Pages: 2
  • Words: 661

Anatomy Lab Questions

Cellular metabolism determines the inner constituents and cell membranes control the flow of ions and other constitutes into and out of the cell. It also depends on the extracellular fluid that surrounds the cell in [...]
  • Pages: 4
  • Words: 2242

Osprey, Pandion Haliaetus: Specie Overview

The eyes of the ospreys are bright yellow, and it has a black beak. In contrast to other predatory birds, the ratio of the Ospreys almost completely consists of fish.
  • Pages: 8
  • Words: 2213

Glycolysis Process in Yeast and in Human

Glycolysis is the process whereby sugar is broken down to produce energy in the human body. In the process of glycolysis, sugar gets oxidized and released in the form of energy ATP energy.
  • Pages: 2
  • Words: 627

Biology. Coral Reef and Its Diseases

The stresses that affect coral reefs can include changes in water temperature, differences in the amount of ultraviolet radiation they are exposed to and the amount of sedimentation and pollutants that settle in and around [...]
  • Pages: 2
  • Words: 602

The Concept of Founder Mutations

Founder mutations may be considered as a type of genetic mutation because these result in a medical disorder, however, founder mutations can be distinguished from the rest of genetic mutations through the basis of its [...]
  • Pages: 3
  • Words: 879

Neurotransmitters. The Process of Signal Transmission

In a normal state, the difference in charged ions inside and outside the membrane and also the availability of a concentration gradient could make the positively charged sodium ions attempt to cross the membrane and [...]
  • Pages: 4
  • Words: 1249

Microbiology Laboratory Report

Further differentiation of the bacterial unknowns was performed through additional colorimetric tests, resulting in the validation of the identity of each bacterial species.
  • Pages: 8
  • Words: 2169

Enzyme Specificity and Regulation

In order to solve the topological problem of unwinding the DNA double helix in order for the process of DNA replication to proceed, DNA topoisomerases are needed in order to break and reunite the two [...]
  • Pages: 4
  • Words: 1454

Membrane Transport Technology Review

The structure of the plasma membrane and the membrane transport system facilitates the controlled and selective ingress and egress of ions and molecules from and to the external environment of the cell.
  • Pages: 4
  • Words: 1035

Vitamin C Test: Medical Analysis

Thus, the concentration of vitamin C in each solution influences the number of iodine drops that are needed in order to change the color of the homogenate solution to black.
  • Pages: 3
  • Words: 953

Bovine Growth Hormone

It aids in the production of milk, increasing it by 10-15%, which is a substantial amount for farmers, due to the increasing consumption and demand for cow's milk and dairy products.
  • Pages: 3
  • Words: 837

How Do Species Change: Discussion

The disadvantage or the negative part of speciation is that some of the species that are not able to adapt to the changes will be extinct in a few year's time.
  • Pages: 5
  • Words: 1480

Brucella Abortus: Biological Review

Cattle are the main infection reservoir, and infection transmits from animals to humans, rarely from one person to another. In other animals, fistulous bursitis with isolation of Brucella abortus from the track is the cardinal [...]
  • Pages: 2
  • Words: 746

Menstruation: Historical Perspectives and Attitudes

Many women have a negative attitude towards menstruation because of the associated changes as the cycle begins and ends. Meanwhile, the use of contraceptives has been noted to influence menstruation.
  • Pages: 2
  • Words: 547

Biology. Smallpox: The Deadly Virus

Such a torturous description of the suffering amplifies the paper's argument of how dangerous this disease has proven to be for mankind. Another type of small pox; flat is always considered to be fatal highlighting [...]
  • Pages: 4
  • Words: 1106

Vitamin A: Description and Usage

Vitamin A found in fruits and vegetable is referred to as Provitamin A carotenoids, these vitamins A are converted into retinol in the body where one molecule of beta carotene produces two molecule of Vitamin [...]
  • Pages: 2
  • Words: 509

Browning Reactions Explained

It is the reaction of free amino groups like amines, amino acids, peptides and proteins with reducing sugars in the presence of heat and during storage.
  • Pages: 2
  • Words: 522

Biochemistry. Chaperone Misfolding

The function of this system is to make sure of the conformity and maturity of proteins produced by blocking the deliverance of incompletely folded or misfolded proteins, which are then destroyed in the cytoplasm.
  • Pages: 4
  • Words: 1288

A Peptic Ulcer: Medical Analysis

It occurs as a result of distorting in the acidic environment of the stomach when the wall lining of the stomach or duodenum erodes due to an increase in gastric acid; this triggers the development [...]
  • Pages: 4
  • Words: 1185

Ethical Debate of Stem Cell Research

The authors of the article Cogle et al.researched under the auspices of Stem Cell Biology and Regenerative Medicine Program of the University of Florida Shands Cancer Center.
  • Pages: 3
  • Words: 1076

Structure and Function of the Editosome

In order for an editosome to approach a specific sequence site along the nascent mRNA strand, short-sequence RNA guides that originate from the mitochondria assist in the identification of sequences along the strand that require [...]
  • Pages: 4
  • Words: 1137

Biology. Erythrocytes or Red Blood Cells

In the presence of CO2 in the tissues, the acidity increases resulting in the release of O2 and consequently protonated hemoglobin caries bicarbonate ion to be release in lungs.
  • Pages: 2
  • Words: 609

Endangered Wild Equids by Patricia D. Moehlman

The article is focused primarily on what can be done to try to save these species for the future and presents a plan that has been adopted by the IUCN The World Conservation Union.
  • Pages: 2
  • Words: 741

Biological and Environmental Science in Hawaii

It is also no surprise that the environment and the great diversity of plant and animal life in Hawaii made the National Research Council declare the islands as "one of the best places in the [...]
  • Pages: 15
  • Words: 5114

Anaerobic respiration

One of the main differences between aerobic and anaerobic respiration is that in anaerobic respiration, there is only a partial breakdown of sugar.
  • Pages: 6
  • Words: 1274

Introduction to Microbiology: Escherichia Coli

This type of E.coli is included in a class of dangerous E.coli, called enterohemorrhagic.E.coli O157:H7 was discovered in 1982, during a severe outbreak of bloody diarrhea, associated with the consumption of contaminated hamburgers. The hemolytic [...]
  • Pages: 8
  • Words: 2465

Stem Cells Biology: Features and Researchs

Stem cells are cells that have the capacity to subdivide into other cells. The second property of stem cells is that they can develop into specialized cells in the differentiation process.
  • Pages: 5
  • Words: 1492

Pfiesteria Piscicida: Classification and Analysis

Pfiesteria piscicida is a single-cell, a microscopic organism found in the environment for millions of years. 8S regions agree to the placement of Pfiesteria in the Peridiniales or a group between the Peridiniales and the [...]
  • Pages: 7
  • Words: 1704

The Importance of Mitochondria and Their Purpose

This involves a furrowing of the inner and then the outer membrane as if someone was pinching the mitochondria. Of course, the mitochondria must first multiply itself several times as their DNA.
  • Pages: 2
  • Words: 676

Prions as Novel Infectious Agent

The most common TSE diseases include the Mad Cow Disease in cattle, Scrapie in sheep, and Chronic Wasting Disease in deer, elk, and moose."Different regions of the brain are affected by different prions".
  • Pages: 5
  • Words: 1435

No to Cloning for Medical Research

Those who do not subscribe to cloning for biomedical research believe that the embryo is in fact "one of us"; a human life in process an equal member of the species "Homo Sapiens" in the [...]
  • Pages:
  • Words: 1452

Discussion of Cuttlefish: Is It a Fish?

While it appears to swim with the aid of delicate-looking fins that line its sides much like the fish uses its fins top and bottom to help propel it through the water, the cuttlefish has [...]
  • Pages:
  • Words: 522

Infectious Bacterial Identification From DNA Sequencing

The first is the preparation of the DNA sequence and matching it with the database of known DNA sequences. Given below is a screenshot of the process PCR Amplification: To prepare the polymerase chain reaction, [...]
  • Pages: 2
  • Words: 1030

Mountain Pine Beetles Review

The trees attack begin with the injured trees, trees with in poor site, infected trees in the roots or stem, fire damaged trees, overcrowded trees and the very old trees during the first stage of [...]
  • Pages: 10
  • Words: 2394

Drug Delivery. Simulated Intestinal Fluids Development

As the use of physiological conditions in Caco-2 cell transport studies affects the transport of compounds, the general purpose of the research "was to identify a simulated intestinal fluid containing physiological relevant surfactants and nutrients [...]
  • Pages: 8
  • Words: 2244

Corn Kernel Color Genetics

The report provides a study done for the trait of corn color for a monohybrid cross of two breeds of corn plants. The paper has examined the distribution of the dominant and recessive color of [...]
  • Pages: 2
  • Words: 485

Growing Mold Recommendations

As for the fourth piece of bread, I put half of it in the dark warm place, on the top of the fridge in a paper bag, and the other half I put in the [...]
  • Pages: 2
  • Words: 593

Sexual Selection Theory by Charles Darwin

The study was able to establish that accessory gland size exhibited positive allometry and males with larger accessory glands were more likely to copulate suggesting that larger size in this trait is favored by sexual [...]
  • Pages: 4
  • Words: 1307

Cardiovascular Physiology. The Heart

The heart is situated in the middle of the thorax with the largest part of the heart slightly offset to the left but for dextrocardia, it is on the right.
  • Pages: 4
  • Words: 1540

Origins of Plant Growth

The purpose of this paper was to determine the origins of plant growth and ascertain the role of light in the growth and development of plants.
  • Pages: 4
  • Words: 1211

B12 Vitamin: Risks and Benefits

Vitamin B12, also known as cobalamin, is a water-soluble vitamin that contributes to blood cell formation, the work of the nervous system, and metabolism.
  • Pages: 2
  • Words: 616

Phagocytosis Mechanism in Higher Animals

The phagocytosis process can only occur after the phagocyte binds to the receptors on the surface of the bacteria. If the phagocyte is not compatible with the available receptors, blood proteins, which are called opsonins, [...]
  • Pages: 3
  • Words: 868

The Digestive System and Its Functions

That is why the proper functioning of the human digestive system serves as the basis for full-fledged life support during the main processes in the digestive tract. In the oral cavity, food enters the throat, [...]
  • Pages: 3
  • Words: 952

Red Blood Cells: Debunking Health Myths

When the kidneys detect a decrease in the level of oxygen under circulation through the blood, they produce a hormone known as erythropoietin, which in turn activates the differentiation of various precursor cells for RBCs. [...]
  • Pages: 2
  • Words: 605

Microbial Biotechnology and Pharmaceutical Impact

Microbes have a vital role in the pharmaceutical industry, being used in the production of antibiotics, probiotics, vaccines, and quality tests to prevent microbial contamination of the medicine developed.
  • Pages: 1
  • Words: 312

Eukaryotic and Prokaryotic Cells: Key Differences

Furthermore, upon the analysis of the differences between eukaryotic and prokaryotic cells, one can develop a proper understanding of the environment that is required for the correct functioning of eukaryotic and prokaryotic cells.
  • Pages: 3
  • Words: 848

Bacteria and Their Positive and Negative Effects

However, the described assumption is quite far from the truth, with a significant number of bacteria being not only useful but also essential to the functioning of the human body and the sustenance of life.
  • Pages: 1
  • Words: 335

Glycolysis Process and Regulation

Glycolysis is the first step in cellular respiration, and it is an anaerobic process that takes place outside of mitochondria. In this step, the phosphate group is detached and taken in by ADP, turning it [...]
  • Pages: 1
  • Words: 295

Geospiza Finches as a Form of Natural Selection

Researching the hybrid offspring of two different Geospiza species may allow delineating some of the existing trends in evolution and speciation, as well as clarifying the views of prominent contributors to evolutionary theory.
  • Pages: 1
  • Words: 299

Life Science Rationale

What are the Purposes of the Botany and Zoology Areas in the Classroom? The role of a teacher is to prepare botany and zoology areas.
  • Pages: 7
  • Words: 1631

Allelopathy in Helianthus Annuus’ Germination

These effects were attributed to the role of gibberellins as allelochemicals in the germination of sunflower seeds. A total of 36 seeds were allocated to the control and treatment groups.
  • Pages: 6
  • Words: 1705