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Science Vocabulary
Key terms for Final
73
Science
7th Grade
06/01/2009

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Term
Atom
Definition
The smallest unit of an element
Term
Atp
Definition
the high energy molecule produced in cellular respiration.
Term
Cellular Respiration
Definition
the cellular reaction that uses oxygen and glucose to produce carbon dioxide and water. The energy released from the glucose is stored in ATP molecules.
Term
Cell wall
Definition
an additional layer of pretection surrounding the cell membrane of some cells.
Term
Chlorophyll
Definition
The green pigment found in plants,algae, and photosynthetic bacteria that captures energy from the sun.
Term
Chromosomes
Definition
Coiled up DNA. We have 46 in our body cells, and 23 in our sex cells
Term
Kinetic energy
Definition
The energy of motion
Term
Mitosis
Definition
cell division that produces body cells.
Term
meiosis
Definition
cell divsion that produces sex cells
Term
Molecule
Definition
two or more atoms held together by chemical forces called bonds.
Term
Peiodic Table of Elements
Definition
a table that provides information on the different elements that make up matter
Term
Matter
Definition
Anything that takes up space.
Term
Photosynthesis
Definition
the cellular reaction that uses energy from the sun, carbon dioxide, and water to produce oxygen and glucose. The energy from the sun is stored in the glucose molecule.
Term
Products
Definition
molecules produced in a chemical reaction. They are located on the right hand side of the arrow
Term
reactants
Definition
molecules broken down in a chemical reaction. Located on left hand side of arrow.
Term
Ribosomes
Definition
organelles that read the code sent from the DNA to produce proteins which give us our traits. All cells have these.
Term
Acquired trait
Definition
Characteristics that are not controlled by genes, such as a pierced ears.
Term
Adaptation
Definition
a trait that helps an organism to survive in its environment
Term
DNA
Definition
a molecule located in the cells of living things that holds the code for the production of proteins.
Term
Fossil
Definition
The solidified remains or imprints of an organism in sedimentary rock
Term
Gene
Definition
A section of DNA that codes for a certain protein
Term
Genetic Engineering
Definition
Changing the genes of an organism
Term
Genetically modified organisms
Definition
Organisms that have had their genes changed in order to change a characteristic
Term
Genotype
Definition
the genes that an organism has for a trait.
Term
Heterozygous
Definition
two different alleles for a trait
Term
Homologous chromosomes
Definition
Pairs of chromosomes that contain genes controlling the same traits.
Term
Homozygous
Definition
two of the same alleles for a trait
Term
Inherited trait
Definition
a characteristic controlled by genes, eye color
Term
Mutation
Definition
a change in the order of bases in DNA, which could result in a change in the protein being produced. Insertion,deletion, and substitution.
Term
Pedigree
Definition
a tool used to observe how a particular trait has been passed down through generations.
Term
Phenotype
Definition
the genes that an organism shows for a trait
Term
Polygenic trait
Definition
a characteristic controlled by multiple sets of genes.
Term
Animal
Definition
a multicellular consumer
Term
bacteria
Definition
simple unicellular organisms without a nucleus. Some can be harmful to humans and some can be helpful.
Term
Binary fission
Definition
a type of asexual reproduction used by bacteria.
Term
biodiversity
Definition
the variety of life in a given area and on earth
Term
Competition
Definition
the struggle among organisms, both of the same and of different species, for food, for space, and other vital requirements.
Term
Decomposer
Definition
an organism that breaks down dead organisms and absorbs their nutrients
Term
Ecosystem
Definition
a community and its environment
Term
Community
Definition
All of the living things in an area
Term
Estivation
Definition
a period of reduced activity in the summer for some animals.
Term
Fibrous roots
Definition
roots that have many branches and are just below the surface of the soil
Term
Food chain
Definition
the path of food energy from the sun to the producer to a series of consumers in an ecosystem
Term
Food web
Definition
an arrangement of several overlapping food chains in an ecosystem
Term
Fungi
Definition
a multicellular decomposer, mushrooms
Term
Germination
Definition
sprouting. The process in which the plant embryo breaks out of the seed coat.
Term
habitat
Definition
the area in which an animal lives
Term
insecticide
Definition
a chemical sprayed onplants to kill insects that might eat them.
Term
mutualism
Definition
one organism lives on or in another and both benefit
Term
natural selection
Definition
the process in which organisms with the most desirable traits for their environment survive, reproduce,and pass the gens for those traits down to their offspring
Term
non-native species
Definition
a species that was introduced to an area and was not originally found in that area.
Term
paramecium
Definition
a type of animal-like protist
Term
parasite
Definition
an organism that lives on a host and harmss it, while helping itself.
Term
population
Definition
all of the organisms of the same species living in a particular area.
Term
predator
Definition
an organism that attacks, kills, and eats another organism
Term
Prey
Definition
the organism that is attacked, killed and consumed by a predator
Term
Producer
Definition
an organism that makes its own food by using photosynthesis
Term
Protist
Definition
unicellular or simple multicellular organisms with a nucleus.
Term
Succession
Definition
Change in the make up of an ecological community over time, often as the result of a disturbance such as a fire.
Term
Tap root
Definition
a single large root that grow deep into the ground.
Term
Transpiration
Definition
the process in which water exits the leaf of a plant through an open stomata
Term
Water cycle
Definition
the cycle in which water moves from land up through the atmosphere and back to the land.
Term
Control group
Definition
group that is most similar to normal, it is used for comparison
Term
Dependent variable
Definition
the factor that is being studied in an experiment.
Term
Experimental error
Definition
the error that results from small human and measuring device errors in an experiment.
Term
Experimental group
Definition
the group in which 1 factor has been changed.
Term
Gram
Definition
the si unit for mass
Term
hypothesis
Definition
an educated guess as to what the results of an experiment will be.
Term
Independent variable
Definition
factor that the scientist is changing between the two groups at the start of the experiment
Term
Liter
Definition
the si unit for volume
Term
Meter
Definition
the si unit for length
Term
Microliter
Definition
one millionth of a liter
Term
Micrometer
Definition
one millionth of a meter
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