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Science Final Exam Vocabulary

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Term
Definition
allele   one of two or more alternate forms of a gene that arises by mutation; found at the same place on the chromosome  
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autotroph   an organism that produces its own food such as plants  
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base   On a microscope, the bottom. When carrying the microscope, hold the arm and the base.  
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cell   the smallest structural and functional unit of an organism  
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cell wall   rigid layer or barrier all around a cell  
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chloroplast   a part of a plant cell in which photosynthesis take place  
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cloning   make an identical copy of something.  
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cytoplasm   material inside a cell excluding the nucleus  
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density   how solid or compact a substance is  
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Periodic table   Organized chart for all elements  
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DNA   carrier of gene information on chromosomes  
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dominant   characteristics that are inherited from a parent even if only one parent has the allele, the strong one  
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genotype   the genetic make up of an organism  
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genus   part of the system for sorting living things--genus comes after species and below family  
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heterotroph   a organism that consumes or eat their food  
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heterozygous   an organism with two different alleles of a particular gene--might have differing offspring  
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homozygous   an organism having two identical alleles of a particular gene-  
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hybrid   an organism with a mixture of alleles for a gene  
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mass   the quantity of matter something contains  
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mitrochondria   a rod-shaped structure that produces energy for the cell; mighty mitochondria  
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nucleus   a cell structure that contains genetic material; the brains of the cell  
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objective lenses   lenses in a microscope which allow magnification of the object  
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pedigree   certain genes that the offspring inherits from the parent  
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phenotype   the physical trait the gene actually produces  
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punnett square   diagram that shows how the genes of two "parents" might possibly combine.  
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purebred   certain genes that the offspring inherits from the parent; both phenotypes are the same  
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recessive   a gene which has a trait that shows when both parents are recessive.  
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responding or dependent variable   a variable in an experiment which is measured or studied.  
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revolving nosepiece   the part of the microscope used to change objective (the magnification)  
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ribosomes   A small grain-like structure in the cytoplasm were cells are made  
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species   a group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.  
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unicellular   one cell, some organisms are unicellular--they consist of one cell.  
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vacuole   water sacs in a cell  
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volume   A measure of the amount of space or substance an object takes up  
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water dispalcement   Technique used to find the volume of an irregularly shaped object  
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multicellular   more than one cell  
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membrane   A thin line of protection which decides what goes in and out of the cell  
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manipulated or independent variable   a variable in an experiment which is intentionally changed by a variable in an experiment which is intentionally changed by  
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eyepiece   The part of the microscope where you put your eye  
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dichotomous key   a tool used to identify an organism. Helps to sort plants and animals into groups with similar characteristics  
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diaphragm   A large dome shaped muscle that plays an important role in breathing  
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control   the object that you compare everything else to  
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coarse adjustment knob   On a microscope: the knob that makes large adjustments to the focus  
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arm   On a microscope: the shaft that attaches the eyepiece body tube revolving nosepiece and objectives to the base  
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Objective   On a microscope: the high medium and low objectives can be changed depending on how small or large the object is.  
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electrons   atomic particles that produce a negative charge  
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neutrons   atomic particles that produce a neutral charge  
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symbiosis   a relationship with benefits for two living organisms  
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biome   a large naturally occurring community of flora and fauna occupying a major habitat, e.g., forest or tundra.  
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length   a measure of how long an object is end-to-end  
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temperature   a measure of heat energy an object or substance has  
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The scientific method   six steps to recognize and try to solve a problem  
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Qualitative Observations   observations using your five senses--color, smell, sounds, feel, taste  
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Quantitative Observations   observations about something recorded in numbers such as weight, length, numbers of times something happens  
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Inferences   A possible explanation based on observations and prior knowledge  
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Hypothesis   an idea or suggested explanation for an observation  
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Experimental Design   how the experiment is designed to test a hypothesis  
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asexual reproduction   reproduction where one parent produces offspring that are genetically identical  
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sexual reproduction   two parent organisms combine genetic material; offspring are genetically different from parents  
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growth   process by which an organism grows bigger  
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development   process by which an organism become more complex  
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homeostasis   ability of an organism to maintain a stable internal environment  
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stimulus   a change in the environment that makes an organism react  
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response   an organism's reaction to a stimulus  
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adaptation   an organism changes to better survive its enviornment  
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classification   grouping things with similar characteristics  
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taxonomy   studying how things are classified  
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kingdoms   In a taxonomy a very general group  
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cell wall   Found only in plant cells; a hard layer surrounding the cell membrane of plants  
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chlorplast   in plants; captures sun's energy to produce food through photosynthesis  
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mitosis   cell division in which one parent cell produces two identical daughter cells  
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meiosis   cell division in which one parent cell produce four daughter cells  
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mutation   a mistake in a genetic code which can occur during DNA replication  
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cancer   caused by a mutation that can lead to uncontrollable division and growth in cells  
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semi-permeable   certain substances can pass through the cell membrane  
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passive transport   movement of molecules into and out of a semi-permeable cell  
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diffusion   molecule move from areas of high concentration to areas of low concentration  
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osmosis   the diffusion of water through a cell membrane  
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traits   a characteristic that an organism can pass on to its offspring  
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biotic factors   all living things in an ecosystem  
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abiotic factors   the nonliving things in an ecosystem  
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population   all the members of one species that live in a specific area  
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community   all the different populations that live in an area  
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habitat   the specific place an organism lives  
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energy source   the source of all energy inmost food webs is the sun  
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producer   an organism that makes its own food (autotroph)  
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Consumer   an organism that gets energy from eating other organisms (heterotroph)  
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decomposer   an organism that breaks down wastes and dead organisms  
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matter   anything that has mass and takes up space  
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solid   a state of matter that has a definite shape and definite volume  
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liquid   a state of matter that has NO definite shape, but has a definite volume; it cannot be compressed  
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gas   a state of matter with no definite shape or volume; it can flow and be compressed  
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physical change   a change in a substance that does not alter its identity  
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chemical change   a change in which one or more substances combine or break apart to form new substances  
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atom   building block of all matter  
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element   types of atoms that cannot be broken down into other substances  
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compound   made of two or more elements  
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molecule   a combination of two or more atoms  
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atomic number   the number of protons in the nucleus of an atom; unique to each element  
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atomic mass   protons and neutrons which are located in the nucleus of an atom  
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period   on the periodic table; a horizontal row of elements; they DO NOT have similar properties  
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Group (Family)   On the periodic table; elements in the same column; have similar properties  
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metals   most elements are metals; almost all are solid at room temperature (except Mercury)  
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metalloids   7 elements found at the boundary of metals and nonmetals  
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Noble Gases   elements with their outer shells filled and DO NOT bond with other atoms  
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