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Midterms 2008 (Biology)
Vocacbuary to study for this year's midterm exams
43
Biology
10th Grade
12/10/2008

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Term
Biology
Definition
study of life
Term
Cell
Definition
highly organized, tiny structure with thin covering called a membrane
Term
Reproduction
Definition
the process by which organisms make more of their own kind from one generation to the next.
Term
Metabolism
Definition
the sum of all of the chemical reactions carried out in an organism
Term
Homeostasis
Definition
The maintenence of stable internal conditions in spite of changes in the external environment
Term
Evolution
Definition
Change in the inherited characteristics of species over generations
Term
Evolution
Definition
Change in the inherited characteristics of species over generations
Term
Atom
Definition
smallest unit of matter that can not be broken down by chemical means
Term
Element
Definition
pure substance made of only one kind of atom
Term
Molecule
Definition
group of atoms held together by covalent bonds
Term
Ion
Definition
An atom or molecule that has gained or lost one or more electrons
Term
Cohesion
Definition
an attraction between substances of the same kind
Term
Adhesion
Definition
an attraction between different substances
Term
Solution
Definition
a mixture in which one or more substances are evenly distributed in another substance
Term
Acid
Definition
compounds that form hydrogen ions when dissolved in water
Term
Base
Definition
compounds that reduce the concentration of hydrogen ions in a solution
Term
Carbohydrates
Definition
organic compounds made of carbon, hydrogen, and oxygen atoms in the ratio of 1:2:1
Term
Monosaccharides
Definition
building blocks of carbohydrates
Term
Lipid
Definition
nonpolar molecule that is not soluble or mostly insoluble in water
Term
Protein
Definition
usually a large molecule formed by linked smaller molecules called amino acids
Term
Amino acid
Definition
building block of protein
Term
Nucleic acid
Definition
a long chain of smaller molecules called nucleotides
Term
Nucleic acid
Definition
a long chain of smaller molecules called nucleotides
Term
Nucleotide
Definition
has three parts: a sugar, base, and phosphate group
Term
DNA
Definition
consists of two strands of nucleotides that spiral around each other
Term
RNA
Definition
may consist of a single strand of nucleotides
Term
ATP
Definition
a single nucleotide with two extra energy-storing phosphate groups
Term
Enzyme
Definition
substance that increases the speed of chemical reactions
Term
Ribosome
Definition
cellular structure on which proteins are made
Term
phospholipid
Definition
lipid made of a phosphate group and two fatty acids
Term
Endoplasmic reticulum
Definition
move proteins and other substances through the cell
Term
Vesicle
Definition
small membrane-bound sac that transports substances in cells
Term
Golgi apparatus
Definition
set of flattened, membrane-bound sacs that serve as the packaging and distribution center of the cell, think "FedEx Kinkos of the cell"
Term
lysosome
Definition
contain the cell's digestive enzymes
Term
Mitochondria
Definition
harvests energy from organic compounds to make ATP
Term
passive transport
Definition
does not require energy
Term
concentration gradient
Definition
difference in the concentration of a substance across the space
Term
diffusion
Definition
the movement of a substance from an area of higher to lower concentration caused by the random motion of particles of the substance
Term
Hypertonic
Definition
more water outside of the cell
Term
hypotonic
Definition
more water inside the cell
Term
isotonic
Definition
equilibrium in the solution and cell
Term
ion channel
Definition
transport protein with a polar pore through which ions can pass
Term
active transport
Definition
movement against concentration gradient
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