Biochemistry Vocabulary Quiz#1 Flashcards
Atom
The basic building blocks of life
Molecule
A group of chemically bonded atoms
Element
pure substance that can’t be broken apart by chemical means
Ion
Charged particlles
Atomic Number
Number of protons
Ionic Bond
Electrons are transferred from metals to
nonmetals
Covalent Bond
Electrons are shared between two or more nonmetals
Hydrogen Bond
Occurs between water molecules, because
water is polar
Polar
a part of the molecule is positively charged, while another part is negatively charge
Nonpolar
molecules that have no charge
Cohesion
is an attractive force between particles of the same kind
Surface Tension
the top layer of the water, behave as an elastic sheet.
Adhesion
is the attraction between the molecules of 2 different substances
Capillary Action
where water molecules move through a substance quickly, or “climb” up a thin tube against gravity
Universal Solvent
Water, because of its polar
Homeostasis
the cell’s stable internal environment
Solution
a homogeneous mixture in which the particles are too small to be seen and very well-mixed; dissolving is a physical change
Homogeneous
mixture in which the particles are too small to be seen and very well-mixed
Solute
substance being dissolved
Solvent
substance doing the dissolving
Acid
produce H+ ions in water
Base
produce OH- ions in water
pH Scale
Measures the amount of H+ ions in a solution
Indicator
a chemical which changes color in the presence of an acid or a base
