Characteristics and classification of living organisms Flashcards
What are the 7 features of all living organisms
Movement, respiration, sensitivity, growth, reproduction, excretion, nutrition
What is movement
An action by an organism or part of an organism causing a change of position or place
What is respiration
The chemical reaction in cells that break down nutrient molecules and release energy for metabolism
What is sensitivity
The ability to detect of sense stimili in the internal or external environment and to make appropriate responses
What is growth
A permanent increase in size and dry mass by an increase in cell number of cell size or both
What is excretion
Removal from organisms of the wast products of metabolism, toxic materials, and substances in excess of requirements
What is nutrition
Takin in of materials for energy, growth, development; plants require light, carbon dioxide, water and ions; animalsneed organic compounds and ions and usually need water
Define species
A group of organisms that can reproduce to produce fertile offspring
Define and describe the binomial system
An internationally agreed system in which the scientific name of an organism is made up of two parts showing the genus and species
What are classification systems aiming to do
Reflect evolutionary relationships
What was classification originally based on
Studies of morphology (size, shape, structure) and anatomy (major body structures)
What can be used as a more accurate means of classification
Sequences of bases in DNA and sequences of amino acids
