WGU C190 Introduction to Biology Final Exam Questions and Answers

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.