Biology 111 Review Questions with Correct
Answers
Scientific hypothesis
A proposed explanation that must be testable and capable of being rejected.
Evidence
Reproducible and quantifiable observations used to support or refute scientific ideas.
Theory
A scientific explanation that can be proven wrong by evidence, but never absolutely proven
correct
Element
A pure substance made of only one kind of atom
Trace elements
elements required in small amounts for proper body function Ex: Calcium, Sodium, Chlorine
Atom
The smallest unit of matter
Matter
Anything that has mass and takes up space
Mass
The quantity of matter in an object.
Nucleus (of atom)
, The center of an atom that contains the protons and neutrons
Proton
positively charged particle
Neutrons
neutral charge, in nucleus
Electron
negatively charged particle
Atomic number
the number of protons in an atom (electrons do not affect this).
Isotope
Two atoms of the same element with different numbers of neutrons
Macromolecule
A large organic molecule ranging from about 1,000 Daltons to about 2,000,000 Daltons;
makes up a large fraction of cell mass
Cell
Basic unit of life
Cell Theory - States that:
1.All living organisms are composed of one or more cells.
2.The cell is the fundamental unit of life.
3.All cells arise from pre-existing cells.
Answers
Scientific hypothesis
A proposed explanation that must be testable and capable of being rejected.
Evidence
Reproducible and quantifiable observations used to support or refute scientific ideas.
Theory
A scientific explanation that can be proven wrong by evidence, but never absolutely proven
correct
Element
A pure substance made of only one kind of atom
Trace elements
elements required in small amounts for proper body function Ex: Calcium, Sodium, Chlorine
Atom
The smallest unit of matter
Matter
Anything that has mass and takes up space
Mass
The quantity of matter in an object.
Nucleus (of atom)
, The center of an atom that contains the protons and neutrons
Proton
positively charged particle
Neutrons
neutral charge, in nucleus
Electron
negatively charged particle
Atomic number
the number of protons in an atom (electrons do not affect this).
Isotope
Two atoms of the same element with different numbers of neutrons
Macromolecule
A large organic molecule ranging from about 1,000 Daltons to about 2,000,000 Daltons;
makes up a large fraction of cell mass
Cell
Basic unit of life
Cell Theory - States that:
1.All living organisms are composed of one or more cells.
2.The cell is the fundamental unit of life.
3.All cells arise from pre-existing cells.
