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A biologist is a professional who has specialized knowledge in the field of biology, understanding the underlying mechanisms that govern the functioning of biological systems within fields such as health, technology and the environment.  Biologists involved in fundamental research attempt to explore and further explain the underlying mechanisms that govern the functioning of living matter. Biologists involved in applied research attempt to develop or improve more specific processes and understanding, in fields such as medicine and industry.
Among the licensing requirements, different countries require biologists to have a Bachelor of Biology, Master of Biology or Doctor of Biology degree.
Biologists are interested in understanding the underlying mechanisms that govern the functioning of living matter as well as the complex properties that emerge from the biophysical, biochemical, cellular and systemic interactions of living systems. Biologists conduct research using the scientific method to test the validity of a theory in a rational, unbiased and reproducible manner. This consists of hypothesis formation, experimentation and data analysis to establish the validity or invalidity of a scientific theory.
There are different types of biologists. Theoretical biologists use mathematical methods and develop models to understand phenomena and ideally predict future experimental results, while experimental biologists conceive experiments to test those predictions.   Some biologists work on microorganisms, while others study multicellular organisms (including humans). Some investigate the nano or micro-scale, others emergent properties such as ecological interactions or cognition. There is much overlap between different fields of biology (e.g. zoology, microbiology, genetics and evolutionary biology) and due to the interdisciplinary nature of the field it is often difficult to classify a life scientist as only one of them. Many biological scientists work in research and development. Some conduct fundamental research to advance human knowledge of life. Furthermore, applied biological research often aids the development of solutions to problems in areas such as human health and the natural environment. Biological scientists mostly work in government, university, and private industry laboratories.
Biologists who work in basic research formulate theories and devise experiments to advance human knowledge on life including topics such as evolution, biochemistry, molecular biology, neuroscience and cell biology.
Biological scientists who work in applied research use instead the accomplishments gained by basic research to further knowledge in particular fields or applications. For example, this applied research may be used to develop new pharmaceutical drugs, treatments and medical diagnostic tests. Biological scientists conducting applied research and product development in private industry may be required to describe their research plans or results to non-scientists who are in a position to veto or approve their ideas. These scientists must consider the business effects of their work.
While theoretical biologists usually work in "dry" labs, formulating mathematical models and running computer simulations, some experimental biologists conduct laboratory experiments involving animals, plants, microorganisms or biomolecules. However, a small part of experimental biological research also occurs outside the laboratory and may involve natural observation rather than experimentation. For example, a botanist may investigate the plant species present in a particular environment, while an ecologist might study how a forest area recovers after a fire.
Swift advances in knowledge of genetics and organic molecules spurred growth in the field of biotechnology, transforming the industries in which biological scientists work. Biological scientists can now manipulate the genetic material of animals and plants, attempting to make organisms (including humans) more productive or resistant to disease. Basic and applied research on biotechnological processes, such as recombining DNA, has led to the production of important substances, including human insulin and growth hormone. Many other substances not previously available in large quantities are now produced by biotechnological means. Some of these substances are useful in treating diseases.
Those working on various genome (chromosomes with their associated genes) projects isolate genes and determine their function. This work continues to lead to the discovery of genes associated with specific diseases and inherited health risks, such as sickle cell anemia. Advances in biotechnology have created research opportunities in almost all areas of biology, with commercial applications in areas such as medicine, agriculture, and environmental remediation.
Most biological scientists specialize in the study of a certain type of organism or in a specific activity, although recent advances have blurred some traditional classifications.[ why?]
- Geneticists study genetics, the science of genes, heredity, and variation of organisms.
- Neuroscientists study the nervous system.
- Developmental biologists study the process of development and growth of organisms
- Biochemists study the chemical composition of living things. They analyze the complex chemical combinations and reactions involved in metabolism, reproduction, and growth.
- Molecular biologists study the biological activity between biomolecules.
- Microbiologists investigate the growth and characteristics of microscopic organisms such as bacteria, algae, or fungi.
- Physiologists study life functions of plants and animals, in the whole organism and at the cellular or molecular level, under normal and abnormal conditions. Physiologists often specialize in functions such as growth, reproduction, photosynthesis, respiration, or movement, or in the physiology of a certain area or system of the organism.
- Biophysicists use experimental methods traditionally employed in physics to answer biological questions .
- Computational Biologists apply the techniques of computer science, applied mathematics and statistics to address biological problems. The main focus lies on developing mathematical modeling and computational simulation techniques. By these means it addresses scientific research topics with their theoretical and experimental questions without a laboratory.
- Zoologists and wildlife biologists study animals and wildlife—their origin, behavior, diseases, and life processes. Some experiment with live animals in controlled or natural surroundings, while others dissect dead animals to study their structure. Zoologists and wildlife biologists also may collect and analyze biological data to determine the environmental effects of current and potential uses of land and water areas. Zoologists usually are identified by the animal group they study. For example, ornithologists study birds, mammalogists study mammals, herpetologists study reptiles and amphibians, ichthyologists study fish, cnidariologists study jellyfishes and entomologists study insects.
- Botanists study plants and their environments. Some study all aspects of plant life, including algae, lichens, mosses, ferns, conifers, and flowering plants; others specialize in areas such as identification and classification of plants, the structure and function of plant parts, the biochemistry of plant processes, the causes and cures of plant diseases, the interaction of plants with other organisms and the environment, the geological record of plants and their evolution. Mycologists study fungi, such as yeasts, mold and mushrooms, which are a separate kingdom from plants.
- Aquatic biologists study micro-organisms, plants, and animals living in water. Marine biologists study salt water organisms, and limnologists study fresh water organisms. Much of the work of marine biology centers on molecular biology, the study of the biochemical processes that take place inside living cells. Marine biology is a branch of oceanography, which is the study of the biological, chemical, geological, and physical characteristics of oceans and the ocean floor. (See the Handbook statements on environmental scientists and hydrologists and on geoscientists.)
- Ecologists investigate the relationships among organisms and between organisms and their environments, examining the effects of population size, pollutants, rainfall, temperature, and altitude. Using knowledge of various scientific disciplines, ecologists may collect, study, and report data on the quality of air, food, soil, and water.
- Evolutionary biologists investigate the evolutionary processes that produced the diversity of life on Earth, starting from a single common ancestor. These processes include natural selection, common descent, and speciation.
Biologists are not usually exposed to unsafe or unhealthy conditions. Those who work with dangerous organisms or toxic substances in the laboratory must follow strict safety procedures to avoid contamination. Many biological scientists, such as botanists, ecologists, and zoologists, conduct field studies that involve strenuous physical activity and primitive living conditions. Biological scientists in the field may work in warm or cold climates, in all kinds of weather.
Marine biologists encounter a variety of working conditions. Some work in laboratories; others work on research ships, and those who work underwater must practice safe diving while working around sharp coral reefs and hazardous marine life. Although some marine biologists obtain their specimens from the sea, many still spend a good deal of their time in laboratories and offices, conducting tests, running experiments, recording results, and compiling data.
Many biologists depend on grant money to fund their research. They may be under pressure to meet deadlines and to conform to rigid grant-writing specifications when preparing proposals to seek new or extended funding.
Biologists typically work regular hours. While the 40-hour workweek is common, longer hours are not uncommon. Researchers may be required to work odd hours in laboratories or other locations (especially while in the field), depending on the nature of their research.
The highest honor awarded to biologists is the Nobel Prize in Physiology or Medicine, awarded since 1901, by the Royal Swedish Academy of Sciences. Another significant award is the Crafoord Prize in Biosciences; established in 1980.
- Mehmet and Turgut (2014). Hydatidosis of the Central Nervous System: Diagnosis and Treatment. Springer-Verlag Berlin Heidelberg. p. 334. ISBN 978-3-642-54359-3.
- "the definition of biology". Dictionary.com. Retrieved 2017-01-27.
- Stroberg, Wylie; Schnell, Santiago (2017-12-07). "On the origin of non-membrane-bound organelles, and their physiological function". Journal of Theoretical Biology. 434: 42–49. doi: 10.1016/j.jtbi.2017.04.006. ISSN 0022-5193. PMC 5630510. PMID 28392184.
- Craig, Nancy (2014). Molecular Biology, Principles of Genome Function. ISBN 9780199658572.
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