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Chap2 - Alive or Not

Chapter 2 - Characteristics and Needs of Living Things

TermDefinition
Cell The smallest unit that ca perform ALL life processes; cells are covered by a membrane and have DNA and cytoplasm
Stimulus Anything that causes a reaction or change in an organism or any part of an organism
Homeostasis The maintenance of a constant internal state in a changing environment
Sexual Reproduction Reproduction in which the sex cells from TWO parents unite, producing offspring that share traits from both parents
Asexual Reproduction Reproduction that does not involve the union of sex cells and in which ONE parent produces offspring identical to itself
Heredity The passing of genetic traits from parents to offspring
Metabolism The sum of all chemical processes that occur in an organism
What are the SIX characteristics of living things? 1) Have cells 2) Sense and respond to change 3) Reproduce 4) Have DNA 5) Use energy 6) Grow and Develop
Producer An organism that can make its own food using energy from its surroundings (such as the sun)
Decomposer An organism that get energy by breaking down the remains of dead organisms or animal wastes and consuming or absorbing the nutrients
Consumer An organism that eats other organisms or organic matter
Proteins A molecule that is made up of amino acids and that is needed to build and repair body structures and to regulate processes in the body
Carbohydrates A class of energy-giving nutrients that includes sugars, starches, and fiber; contain carbon, hydrogen, and oxygen
Lipid A type of biochemical that does not dissolve in water - fats and steroids are lipids
Phospholipid A lipid that contains phosphorus and that is a structural component in cell membranes
ATP (Adenosine TriPhosphate) A molecule that acts as the main energy source for cell processes
Nucleic Acid A molecule made up of subunits called nucleotides
What are the FOUR needs of living things? 1) Water 2) Air 3) A place to live 4) Food
Created by: MrsBarr
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