an explaination that is baced on prior scientific reasearch or observations and that can be tested
an experiment that only tests one factor at a time by useing a comparison of a control group with an exparimental group
a pattern, plan, representation, or discription designed to show the structure or workings of an object, system or concept.
the application of science for practical purposes; the use of tools, machines, materials, and processes to meet human needs
compound light microscope
an instument that maginifies small objects so that they can be seen easily by useing two or more lenses
the smallest unit that can perform all life processes; cells are covered by a membrain and have dna and cytoplasm
reproduction in which the sex cells from two parents unite, producing offsping that share traits from both parents.
reproductin that does not involve the unionof sex cells andin which one parent produces offspiring identical to itself
an organisum that gets energy by breaking down remains of dead organisms or or animal wasts and consuming or absorbing the nutrients
a molecule that is made up of amino acids and that is needed to build and repair body stuctures and to regulate processes in the body
a class of energy giving nutrients that includes sugars, starches, and fiber; contains carbon hydrogen and oxygen
adenosine triphosphate, a molecule that acts as the main energy source for for cell processes (in the mitochondria)
a phospholipid layer that covers a cells surface; acts as a barrier between the inside of a cell and a cells environment.
one of the small bodies in a cells cytoplasm that are speciize to prerform a specific function
in a eukaryotic cell, a membrain bound organelle that contains the cell's DNA and has a role in processes such as growth, metabolism, and reproduction.
an organisum made up of cells thathave a nuecleus enclosed by a membrain; eukaryotes include animals, plants, or fungi,but not archaea or bacteria
a rigid structure that surrounds the cell membrain and provides support to the cell in plant cells only
a system of membrains that is found in a cells cytoplasmand that assists in the production, processing and transporting of proteins and in the production of lipids.
in eukaryotic cells the cell organelle is surounded by two membrains and that is the site of cellular resparation.
cell organelle that helps make and package materials to be transported out of the cell
the movement of substances accros a cell membrain without the use of energy by the cell
the movement of substances accros a cell membrain that reqires the cell to use energy
a process in which a cell membrain surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell
the process in which a cell releases a particle by enclosing the particle in a vesicle that then move to the cell surface and fuses with the cell membrain.
the process by which plants, alge, and some bacteria use sunlight carbon dioxide and water to make food.
in a eukaryotic cell, one of the structures in the nuecleus that are made up of dna and protien; in a prokaryotic cell, the main ring of dna
in eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same numer of chromosomes
the entire genetic makeup of an organism; also the combination of genes for one or more traits
a process in cell division during which the number of chromosomes decreses to half the originalnumber by two divisions of the nucleus, which results in the production of sex cells
DeoxyriboNucleic Acid, a molecule that is present in all living cellsand that contains all the information that determinds the traits that a living thinginharits and needs to live.
in a nucleic- acid chain a subunit that consits of a sugar, aphospate and a nitrogenous base