An informative lesson has learners read about, discuss, and study the classification, structure and importance of the following biomolecules: carbohydrates, proteins, lipids, nucleic acids, and enzymes. 

Why is lactase important? Biology scholars explore enzyme function in a structured inquiry lab. The activity tasks lab groups with observing how temperature and pH affect enzyme activity, as well as determining which milk products...

Can your biology class crack the Case of the Crown Jewels? Junior forensics experts try their hands at DNA restriction analysis in an exciting lab activity. The lesson introduces the concept of restriction analysis, teaches pipetting and...

Slideshow notes introduce enzymes: their purpose, process, and importance.

Discusses the properties of enzymes and the concept of enzyme-substrate specificity, and how a substrate molecule binds to an enzyme to form an enzyme-substrate complex. An overview of enzyme-substrate reactions is also presented.

Explains what enzymes are, the three broad categories, their working mechanism and two theories developed to explain this, and factors that impact enzyme activity.

Explains what is meant by enzyme activity and the factors that impact on their ability to function. Looks at temperature, pH value, substrate concentration, enzyme concentration, the presence of inhibitors, and allosteric factors that...

Every enzyme has an optimal pH value at which it functions best. This article explains why pH has an effect on enzyme activity and how it affects them.

Explains how rennin is produced and why it is important in the human body. Describes some other uses of rennin and how it is sometimes confused with a different enzyme named renin.

This tutorial takes a brief look at enzyme activity and how enzymes work as catalysts.

NADH and NADPH are enzymes involved in cellular processes. Explains how NADH participates in catabolic reactions where energy is released and NADPH is involved in anabolic reactions where energy is consumed. Their functions and chemical...

Students learn about molecules, cells, and systems. Some topics investigated in the tutorial are cell types, enzymes, plasma membranes, and the heart.

Discusses what happens during DNA replication and describes the prime replication enzymes found in eukaryotes.

Explains sources of rennin and what its functions and uses are.

Read about the 1959 co-recipient of the Nobel Prize in Physiology -- Severo Ochoa -- who contributed to the "discovery of the mechanisms in the biological synthesis of ribonucleic acid and deoxyribobucleic acid."

Part of a year-long high school biology class online project, this page discusses the two major roles of lysosomes.

Discusses the structure of the matrix inside a mitochondrion and how hundreds of concentrated enzymes are held there. The matrix takes part in mitochondrial functions such as the Krebs cycle, the electron transport chain, ATP synthesis,...

Information about how DNA is viewed in modern biology (it is at the center) and what its role is.

This article looks at a few of the most important core cell cycle regulators: proteins called cyclins, enzymes called Cdks, and an enzyme complex called the APC/C.

Article looks at different types of receptors and ligands, seeing how they interact to turn information from outside the cell into a change inside the cell.

Wikipedia offers brief but accurate information on cytoplasm, the matter contained within the plasma membrane of a cell.