BI SC 004 Study Guide - Comprehensive Midterm Guide: Endoplasmic Reticulum, Cell Membrane, Elastic Cartilage
Document Summary
All objects in the universe are made up of matter. Matter consists of one or more elements. Approximately: 25 elements are essential to life. Matter is anything that: has mass, takes up space. Elements are the basic building blocks of matter that: cannot be broken down by chemical means. Atoms are the smallest units of an element that: retain the element"s properties. Neutrons and protons make up the nucleus. Electrons: negatively charged, orbit around the nucleus. Made of atoms that are bonded together. Can be made of: the same atom, different atoms. Atoms that form molecules can form bonds in different ways. Atoms in this type of bond either: donate electrons, accept electrons. Results in a stable outer valence shell. Atoms in this type of bond share electrons. Result in a stable outer valence shell. The structure is similar to a triglyceride. One fatty acid is replaced by a polar phosphate group. Phospholipids are: the primary components of cellular membranes.
