All Chapters
Ch.1 - Introduction to Biology
Ch.2 - Chemistry
Ch.3 - Water
Ch 4. Biomolecules
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
Atoms- Smallest Unit of Matter
Introduction to Chemical Bonding
Covalent Bonds
Noncovalent Bonds
Ionic Bonding
Hydrogen Bonding

Concept #1: Covalent Bonds

Practice: When two atoms share a pair of electrons, the bonding is referred to as:

a) Ionic.

b) Covalent.     

c) Unstable.          

d) Hydrogen.     

e) Polar.

Concept #2: Nonpolar Covalent Bonds

Practice: What makes a covalent bond nonpolar?

a) The bonded atoms share electrons unequally.

b) The bonded atoms share electrons equally.

c) The bonded atoms have equal electronegativities.

d) The bonded atoms have unequal electronegativities.

e) a and d only.

f) b and c only.

Concept #3: Polar Covalent Bonds

Practice: 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.

Practice: Bonds between two atoms that are equally or similarly electronegative are ________.

Practice: The hydrogens and oxygen of a water molecule are held together by ______ bonds.