WGU C190 Intro to Biology (Answered)
311 Questions and Correct Answers.
100% Correct, Updated Fall 2024/2025.
Abiotic
Non-living, may be within or made by a living organism.
Biotic
Living. Matter is considered ______ if it was ever alive at some point in time
Atom
Smallest level. The basic unit of matter. Consists of a dense nucleus surrounded by electrons.
Molecule
Second level. A chemical structure consisting of at least two atoms held together by a chemical bond.
Macromolecule
Third level. Biologically important molecules that are technically polymers. Example: DNA.
Cell
Fourth level. The fundamental unit of life. Essentially a tiny droplet of water and other molecules
enclosed by a fluid "skin" or membrane. The smallest and simplest entity that possesses all the
characteristics of life.
Organelle
Fifth level. Compartments inside the cell that contain specific groups of macromolecules and carry out
specific cellular functions. One of these organelles is the nucleus; it encloses the DNA within the cell.
Microorganism
Sixth level. Single-celled life form. Consists of just one cell and include unicellular organisms such as
bacteria and protists.
Tissue
Seventh level. Formed when similar cells work together to fulfill the same detailed function.
Organ
Eighth level. Collections of tissues that work together to carry out a common general function. Present
not only in higher level animals but also in plants.
Organ System
,Ninth level. Consists of functionally related organs. Mammals have many.
Organism
Tenth Level. Individual living entities that survive and reproduce as a unit. For example, each tree in a
forest.
Population
Eleventh level. Consists of all the individuals of a species living within a specific area.
Community
Twelfth level. Populations can interact with each other in positive and negative ways, and together they
form this.
Ecosystem
Thirteenth level. Consists of all the living things in a particular area together with the abiotic, or
nonliving, parts of that environment.
Biosphere
Fourteenth level. The highest level of organization in living systems. The collection of all ecosystems on
Earth. Includes all habitable zones on the planet, including land, soil, and rocks to a great depth in the
Earth's crust; water and ice; and the atmosphere to a great height.
Emergent Properties
Characteristics of a system that are not present in any of its component parts.
Biology
The scientific study of life and is the branch of science that studies living organisms and the way
organisms interact with their environments.
Homeostasis
The ability or tendency of organisms and cells to maintain stable internal conditions.
Nutrient
Any matter an organism needs but cannot make for itself.
Energy
The capacity to do work or to make a change in the location, temperature, or structure of matter. Does
not have mass and it does not take up space, but it can be measured in terms of what it does.
Growth
An increase in size.
Development
, Structure and function change in an orderly way as an organism passes through its life cycle. An
individual's pattern of _______ is partly determined by genetic instructions.
Reproduction
Occurs when an individual organism passes on its genetic information to a newly independent organism,
or offspring.
Evolution
A scientific theory that explains how and why life changes over time. Provides the explanation for why all
living organisms share profound similarities, and yet, the life forms on our planet are so incredibly
diverse.
Natural Selection
Individuals are always a bit different from their parents and from each other, partly because of changes
to their genes. These differences may be helpful or harmful to the individuals that inherit them. In
nature, individuals often have very low odds of surviving to reproduce. Individuals with slightly harmful
or even average characteristics might be less likely to make it, and those with traits that fit in very well
with the local habitat will have the greatest chance to survive and reproduce. This sorting process goes
on generation after generation.
Atomic Mass
The sum of the number of protons and the number of neutrons. The mass of an atom.
Atomic Number
The number of protons in an atom, displayed for each atom in the periodic table.
Chemical Bonds
Attractions between atoms that hold atoms and molecules together.
Covalent Bonds
Strongest chemical bond. Occurs between atoms of in the same molecule. Electron pairs are shared,
creating a strong bond between atoms.
electron
Subatomic particle, located in shells on the outside of the nucleus, has a negative charge and almost no
mass.
electronegativity
A measure of the tendency of an atom to attract a bonding pair of electrons. How strongly does an
atoms attract bonding electrons to itself?
element
Atoms with unique properties, designated by the atomic number.
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