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science mid- term exam


any living thing


the smallest unit of an organism that carries on the functions of life


the regularion of an organisms internal, life maintaining condition despite changes in its enviroment

binomial nomenclature

the two word naming system used to name various organisms


a group of similar species


the largest group of the classification system


the evolutionary history of an organism

dichotomus key

detailed list of scientific names and identifying characteristics

Carolus Linnaeus

invented two word naming systemused widely by scientists

cell theory

the theory that every cell came from a cell that
already exsisted

cell wall

tough, rigid outer covering that protects cells and give them shape

cell membrane

the outer most covering of a cell


a gelatin like substance in a cell


small stuctures that cells make proteins on


stuctures in the cytoplasm of a cell that produces energy and other things


a part of a cell which all activities are directed by


green organelles in the cytoplasm that food is made of


releases the energy in food

endoplasmic reticulum

a complex series of membranes in the cytoplasm of a cell

Golgi bodies

stacked, flattened membranes that package and transport materials


a group of similar cells that work together


a stucture of two different types of tissues that work together

organ system

a group of organs working together to perform a certain function

host cell

living cell in which a virus can actively multiply or in which a virus can hide until activated by enviromental stimuli


a strand of hereditary material surronded by a protein coating


the process in which the nucleus divides to form two identical nuclei


a structure in the nucleus divides to form two identical nuclei

asexual reproduction

a new organism is produced from one organism


liquid part of blood


a molecule that carries oxygen and carbondioxide and keeps blood red


irregularly shaped cell fragments that helps clot blood


blood vessel that carries blood away from the heart


blood vessels that connect arteies and veins


blood vessels that bring blood back to the heart


fluid that has diffused into the lymphatic capillaries


the process of heating a liquid to a temperature that kills most bacteria

infeectious disease

a disease that is spread from an infected organism or the enviroment to another organism

noninfectious disease

not spread from one person to another


substances that cause an allergic response

immune system

a system in our bodies that fights pathogens and diseases

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