key terms

a region on an enzyme that binds to a protein or other substance during a reaction

the movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy

adenosine triphosphate is the energy carrier molecule in all living thing

a substance that increases the rate of a chemical reaction without itself undergoing any permanebt chemical change

basic building block/unit of life. the smallest stuctural and funtional unit of an organism, whitch is typically microscopic.

the cell cycle, or cell-division cycle, is the series of events that place in a cell leading to its divison and duplication.

organelles found in the cytoplam of photosynthetic organismand its the site of phtosynthesis

a molecule (such as a protein or a nucleic asid) wherein its chemical stucture is alutered so that some of its origal properties are lost or diminished

the passive movment of molecules of particles along a concentration gradent, or from regions of higher to regions of lower concentration

a self-replicating material which is preeent in nearly all living organisms as the the main constituent of chromosomes. it is the carryer of genetic information.

a substance produced by a living organism which acts as a catalyst to bring about a specific biochemical reaction

transport of substance across a menmbrain from a region of low concentration by a carrier molecule

the transportation of ion agenst a concentration gradient though a menbrane using the energy from ATP

organelles found in the cytoplasm which are the site of celluar respiration. It is the powerhouse of the cell

a type of cell divison that resules in two daughter cells each having the same number and kind of chromsomes as the parent cell

basic building blocks of nucleic acids, such as DNA and RNA. an organic compound made up of a nitrogenous base, a suga and a phosphate groupe

an organsued and speciaised structer found within cells

a process by which water passes through a semi-permeable membrane from a region of high concentration to a region of low concentration

transport of a substance across a cell membrane by diffusion. expenditure of energy is not required

the process of engulfing and ingestion of particles by a cell

enzyme controlled process occurring in plants that uses energy from sunlight to fix carbon dioxide and water in the production by a cell

the process of taking fluit into cell by forming narrow channels through its membrane that pinch off into vesicles

any of a class of nitrogenous organic compound which have large molecules comosed of one or more longchains of amino acids

a membrane that only allows certain molcules to pass through it