Biology - The Science of Biology | Biology

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Study GuideBiology–The Science of Biology1. Introduction to BiologyBiologyis the science of life. Simply put, it is the study of living things and how they work. From tinycells to large animals and plants, biology helps us understand what makes life possible.1.1 What Does Biology Study?Biology looks at life from many different angles:•Cells–All living things are made of cells. Biology studies how cells are structured and howthey function.•Energy and metabolism–Living organisms need energy to grow, move, and survive.Biology explains how this energy is obtained and used.•Genetics and inheritance–Biology explores how traits are passed from parents to offspringthrough genes.•Evolution and diversity–It also examines how living organisms have changed over timeand why there is such a wide variety of life on Earth.Biologists studymicroorganisms, plants, and animals, focusing on how their structures supporttheir everyday activities. This helps explain how living things survive, grow, and interact with theirsurroundings.1.2 Biology and Other SciencesBiology does not stand alone. It is closely connected tochemistry and physics. The chemical andphysical laws that apply to non-living matter also apply to living organisms. For example, chemicalreactions power life processes, and physical forces affect movement and structure.1.3 Branches of BiologyBiology is a broad subject with many specialized areas. These can be grouped into two maincategories:practical biologyandtheoretical biology.

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Study Guide1.4 Practical BiologyPractical biology focuses on real-world applications that directly benefit people and the environment.Examples include:•Plant breeding–improving crops for better yield and quality•Wildlife management–protecting and managing animal populations•Medical science–understanding diseases and developing treatments•Crop production–increasing food supply and farming efficiency1.5 Theoretical BiologyTheoretical biology helps us understand how living systems work. Important fields include:•Physiology–the study of how living organisms function•Biochemistry–the study of the chemical processes inside organisms•Taxonomy–the classification and naming of living things•Ecology–the study of populations and how they interact with each other and theenvironment•Microbiology–the study of microscopic organisms2. Characteristics of Living ThingsWhat exactly makes somethingalive?This is not an easy question toanswer. Scientists still find it challenging to define “life.” However,living things share a set of key characteristics that help us recognize and understand what life is.1. Complex OrganizationLiving things are highly organized. They are much more complex than nonliving objects like rocks orwater.

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Study Guide•Every living thing is made ofone or more cells.•Cells are the basic units of life and are usually too small to see without a microscope.•Similar cells work together to formtissues.•Tissues combine to makeorgans, such as the stomach or kidneys.•Organs that work together form anorgan system.•All organ systems together make up anorganism.This clear, layered organization is a key feature of all living things.2. MetabolismAll living things carry outmetabolism, which refers to the chemical reactions that keep them alive.•Metabolism involves taking in materials from the environment.•These materials are changed inside cells to build structures and release or useenergy.•Energy isneeded for growth, movement, repair, and other life processes.Nonliving things do not have metabolism—they do not carry out chemical reactions to sustainthemselves.3. ResponsivenessLiving things canrespond to stimuli, which are changes in theirenvironment.Examples of stimuli include:•Light•Heat•Sound•Chemicals•Touch or pressureTo detect these changes, organisms have special structures such aseyes, ears, and taste buds.

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Study GuideCoordination and Response•The body usesnervesandhormonesto coordinate responses.•Effectors, such as muscles and glands, carry out the response.•Energy is usually required for these actions.Living organisms also showbehavior, meaning they actively change how they act in response to theenvironment. For example, an animal may move toward food or away from danger. This activeresponse is different from nonliving objects, like a rock rolling downhill, which move passively.4. GrowthLiving things grow in a very specific way.•Growth happens when an organism takes in materials from its environment.•These materials are reorganized to form new parts of the organism.•Energy from metabolism is used to support this process.A key feature of growth is that living organisms turnunlike materials into more of themselves. Forexample, when a person eats food, the body breaks it down and uses it to build new cells. Nonlivingthings cannot do this.5. ReproductionLiving things canreproduce, meaning they can make copies of themselves while still alive.Types of Reproduction•Asexual reproduction○Involves only one parent.○The offspring are usually identical to the parent.○Example: Bacteria reproduce bybinary fission, where one cell splits into two.•Sexual reproduction

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