All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch.4 - Carbon
Ch.5 - Biological Molecules
Ch.6 - Cells
Ch.7 - The Membrane
Ch.8 - Energy and Metabolism
Ch.9 - Respiration
Ch.10 - Photosynthesis
Ch.11 - Cell Signaling
Ch.12 - Cell Division
Ch.13 - Meiosis
Ch.14 - Mendelian Genetics
Ch.15 - Chromosomal Theory of Inheritance
Ch.16 - DNA Synthesis
Ch.17 - Gene Expression
Ch.18 - Regulation of Expression
Ch.19 - Viruses
Ch.20 - Biotechnology
Ch.21 - Genomics
Ch.22 - Development
Ch.23 - Evolution by Natural Selection
Ch.24 - Evolution of Populations
Ch.25 - Speciation
Ch.26 - History of Life on Earth
Ch.27 - Phylogeny
Ch.28 - Prokaryotes
Ch.29 - Protists
Ch.30 - Plants
Ch.31 - Fungi
Ch.32 - Overview of Animals
Ch.33 - Invertebrates
Ch.34 - Vertebrates
Ch.35 - Plant Anatomy
Ch.36 - Vascular Plant Transport
Ch.37 - Soil
Ch.38 - Plant Reproduction
Ch.39 - Plant Sensation and Response
Ch.40 - Animal Form and Function
Ch.41 - Digestive System
Ch.42 - Circulatory System
Ch.43 - Immune System
Ch.44 - Osmoregulation and Excretion
Ch.45 - Endocrine System
Ch.46 - Animal Reproduction
Ch.47 - Nervous System
Ch.48 - Sensory Systems
Ch.49 - Muscle Systems
Ch.50 - Ecology
Ch.51 - Animal Behavior
Ch.52 - Population Ecology
Ch.53 - Community Ecology
Ch.54 - Ecosystems
Ch.55 - Conservation Biology
Additional Practice
Atomic Structure

Concept #2: Intermolecular Forces

Concept #3: Chemical Reactions

Practice: Why is water polar?

Practice: Electrons are shared in a hydrogen bond.

Practice: The chemical reactions in a living cell are at equilibrium.

Practice: Oxidation is _____________________________, reduction is _____________________________.

Additional Problems
In chemical reactions, the gain of an electron is called a. oxidation b. reduction c. polymerization d. ionization e. covalent bonding
The chemical behavior (whether it likes to form bonds with other atoms) of an atom is determined by: a. the number of electrons in its outermost energy shell. b. the number of electrons in all of its shells. c. the number of protons in its valence shell. d. the number of protons in its nucleus. e. the number of protons and neutrons in its nucleus.
Sodium has 11 electrons arranged in three energy levels. The outer level has only one electron. In order to become stable, the atom loses an electron thus exposing the previous level with 8 electrons and subsequently becomes an ion with a. 1 negative charge b. no charge c. 8 negative charges d. 1 positive charge e. 8 positive charges
Two carbon atoms might be joined to each other by the sharing of two pairs of electrons, forming a. a single bond b. an ionic bond c. a carbon bond d. a double bond e. a quadruple (4 point) bond
If an atom has a valence shell that is full it:  a. Is highly reactive b. Is not chemically stable c. Is highly likely to combine with other atoms d. Is not inert e. Is chemically stable
Cations and anions would be most frequently associated with which of the following: a. polar covalent bonds b. van der waals forces c. ionic bonds d. nonpolar covalent bonds e. more than one of the above is correct
In a covalent bond:  a. Atoms share electrons b. Atoms of opposite charges attract each other c. Atoms share a proton
An ionic bond is a bond in which:  a. Atoms share electrons b. Atoms share a proton c. Atoms of opposite charges attract each other
In the example of ionic bond formation between sodium and chlorine, which of the following is not a true statement?  a. Na is the chemical symbol for sodium b. Chlorine donates an electron c. Sodium donates an electron d. Sodium becomes positively charged e. The bond that is formed is a strong bond
If a covalent bond is polar:  a. Electrons are not shared by atoms b. Protons are shared by atoms c. The bond is not important to living cells d. One of the atoms has a partial negative charge e. The bond is not a strong bond
The hydrogens and oxygen of a water molecule are held together by ______ bonds.A. electronB. hydrogenC. covalentD. osmotic
Which drawing in the figure below  depicts the electron configuration of an element with chemical properties most similar to Helium (2He)?