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Questions and Answers
What is the primary function of respiration in living organisms?
What is the primary function of respiration in living organisms?
What is the correct sequence of classification in organisms?
What is the correct sequence of classification in organisms?
What is the term for the ability to detect and respond to changes in the internal or external environment?
What is the term for the ability to detect and respond to changes in the internal or external environment?
What is the purpose of dichotomous keys in classification?
What is the purpose of dichotomous keys in classification?
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What is the term for the process of removing waste products from the body?
What is the term for the process of removing waste products from the body?
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What is the characteristic of organisms that are classified as animals?
What is the characteristic of organisms that are classified as animals?
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What is the purpose of classification in organisms?
What is the purpose of classification in organisms?
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What is the term for the permanent increase in size and dry mass of an organism?
What is the term for the permanent increase in size and dry mass of an organism?
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Study Notes
Characteristics of Living Organisms
- MRS GREN is an acronym that represents the characteristics of living organisms: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, and Nutrition.
- Movement refers to an action by an organism or part of an organism causing a change of position or place.
- Respiration is the process of breaking down nutrient molecules to release energy for metabolism.
- Sensitivity is the ability to detect and respond to changes in the internal or external environment.
- Growth is a permanent increase in size and dry mass.
- Reproduction involves the processes that make more of the same kind of organism.
- Excretion is the removal of waste products of metabolism and substances in excess of requirements.
- Nutrition is the taking in of materials for energy, growth, and development.
Classification of Living Organisms
- Classification is a system that helps show the evolutionary relationships between organisms.
- Scientists use the DNA base sequence to classify organisms, as the similarity in DNA chains shows how closely two organisms are related.
- Dichotomous Keys are used to classify organisms based on visible features, providing a choice of two features at each step until the organism is narrowed down to its genus and species.
Features of Organisms
- The Five Kingdoms of organisms are classified based on shared features.
- Animals are multicellular, ingestive, and heterotrophic (eat living organisms).
- The sequence of classification is: Kingdom → Phylum → Classes → Orders → Families → Genus → Species.
- The acronym "King Philip, Come Over For Good Soup" is used to remember the sequence of classification.
- The Binomial Nomenclature is an internationally agreed system where an organism's scientific name consists of two parts: genus and species.
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Description
Explore the fundamental characteristics of living organisms, including movement, respiration, sensitivity, and growth. Learn about the MRS GREN acronym and how it relates to life processes.
