Atoms, Molecules, Enzymes

Question 1

Cell

Answer 1

A basic unit of living matter separated from its environment by a plasma membrane; the fundamental structural unit of life.

Question 2

Atom

Answer 2

The smallest unit of matter that has the properties of an element.

Question 3

Element

Answer 3

Any substance that cannot be broken down to any other substance.

Question 4

Molecule

Answer 4

Two or more atoms held together by covalent bonds.

Question 5

Covalent bonds

Answer 5

A chemical bond formed as a result of the sharing of one or more pairs of electrons.

Question 6

Enzymes

Answer 6

A class of proteins that serve as catalysts, or chemical agents that change the rate of a reaction without being consumed by the reaction

Question 7

Electron

Answer 7

A particle with a single negative charge; one or more electrons orbit the nucleus of the atom.

Question 8

Proton

Answer 8

A subatomic particle with a single positive electrical charge, found in the nucleus of the atom.

Question 9

Neutron

Answer 9

An electrically neutral particle (a particle having no electrical charge), found in the atom.

Question 10

Nucleus

Answer 10

An atom’s central core, containing protons and neutrons.

Question 11

Subatomic particle

Answer 11

A particle that is smaller than an atom