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Chapter 1 Key Terms

Horizontales
The bulding block of every physical thing in existenc;there is one type of atom for each element.
A physical change in the DNA.
Negatively charged subatomic particle that orbits the nucleus of an atom.
The smallest unit of life.
The term Darwin used to describe the mechanism by which species change over time; conditions in the natural world select which individuals will survive and reproduce.
Reproduction that involves a single parent and no sex.
The variety of life forms i nthe natural world.
The outermost shell of an atom that can accomodate a specififc number of electrons.
Protein that makes it easier of chemical reactions to occur.
Large molecule made up of many atoms.
The assignment of every species to a genus, family, order, class, phylum, and kingdom.
Neutral subatomic particle inside the nucleus of an atom.
Verticales
Formed through the chemical bonding of atoms
All of the chemical reactions in cells that sustain life.
Sharing of electrons in the outer shell of more than one atom.
A substance composed of only one type of atom.
The unique classification of each species from kingdom to species.
Reproduction that occurs when an egg cell form a female fuses with a sperm cell from a male to form a new individual.
Different version of the same gene
Positively charged subatomic particle inside the nucleus of an atom.
Theory that explains how all living organisms are related and how existing populations adapt to their environments and new species arise.
Central sphere of an atom made of protons and neutrons, with electrons orbiting.