An explanation of why carbohydrates are important nutrients for the human body. Chemical formulas and structures are used to demonstrate simple and complex carbohydrates.

An explanation of the importance of fats and proteins in the human diet. Examples of chemical structures of various fats and proteins are used.

Explore and review the biological molecules necessary for life.

In this learning module from The Concord Consortium, students will investigate how polar and nonpolar regions in big molecules interact to result in certain shapes and properties for those molecules.

Practice questions over regulating electron carrier molecules.

This study guide on protein synthesis covers key terminology, protein molecules and the genetic code, RNA types and their roles, transcription, translation, and a few misconceptions. It is available for download with free registration.

Online biology textbook discussing the chemical nature of water, and the importance of its molecular structure to life. Also discusses at length the organic molecules nucleic acids, proteins, lipids, and carbohydrates.

In this online biology textbook, learn about atoms and molecules as they relate to life. Find out about topics such as electrons and energy, chemical bonding, and chemical reactions.

This simulation can be used to study molecule movement across a semipermeable membrane.

Instructional module focusing on the physical structure of DNA. Discussion incorporates the description of the nucleotides, base pairs, and the double helix shape of a DNA molecule. Site also includes an interactive practice quiz and...

This general tutorial begins with an explanation of the polarity of the water molecule and the effects this polarity has on the properties of water. Goes on to introduce organic molecules and has a thourough tutorial on the third page.

Very good description of the process of translation with a good graphic to go along with it. Includes a chart classifying all of the RNA Codons.

This resource is an article about the cell membrane, and its role in water and solute movement in and out of the cell.

Read about carbohydrates, which make up one of the three "Major classes of macronutrients that are essential to living organisms." In addition to defining several terms, including carbohydrate, simple sugars, complex carbohydrates,...

Find out about the process of transcription, where the DNA sequence of a gene is transcribed to make an RNA molecule.

Endocytosis enables cells to absorb extracellular nutrients that are needed for their survival. In receptor-mediated endocytosis, a protein receptor on the cell membrane binds to a nutrient molecule and facilitates its absorption through...

Students will be able to identify two ways that molecules and ions cross the plasma membrane.

A stop codon is a nucleotide triplet in messenger RNA that signals the end of a protein during the translation process. Read about how this works, the different types of stop codons, and how a mutation can sometimes occur.

This information can be used for exam review or as an introduction. It presents a good overview of the topics with charts, graphs, links, and a quiz.