[Free Registration/Login may be required to access all resource tools.] Tutorial explains the function of the sodium-potassium pump. Students will learn the difference between a concentration gradient and an electrochemical gradient.

[Free Registration/Login may be required to access all resource tools.] In this lesson, students will learn the difference between exocytosis and endocytosis and distinguish phagocytosis from pinocytosis. They will also be able to define...

[Free Registration/Login may be required to access all resource tools.] Students are provided with an overview of cellular respiration and mitochondria. They will learn the role of cellular respiration and its three stages, describe the...

[Free Registration/Login may be required to access all resource tools.] Tutorial presents an overview of fermentation explaining its benefits. Students will be able to distinguish lactic acid fermentation from alcoholic fermentation and...

[Free Registration/Login may be required to access all resource tools.] Students take a look at glucose and ATP. They will be able to explain the structure of ATP and will learn how ATP is a source of energy for a cell.

[Free Registration/Login may be required to access all resource tools.] The steps and products of glycolysis are examined in this activity. Students will learn how and where the initial reactions of glycolysis occurs.

[Free Registration/Login may be required to access all resource tools.] After studying the Krebs Citric Acid Cycle, students will be able to identify what happens to the product of glycolysis and explain the steps and results of the cycle.

[Free Registration/Login may be required to access all resource tools.] Discover how a mitochondrial electron transport chain works. This tutorial helps students identify the products of the Krebs cycle, describe a chemiosmotic gradient,...

[Free Registration/Login may be required to access all resource tools.] Exercise provides an overview of special structures found in plant cells. It explains the function of the cell wall, explores the role of the central vacuole, and...

[Free Registration/Login may be required to access all resource tools.] The first stage of photosynthesis, light reactions, is summarized. The steps are listed, photolysis and the role of ATP synthase is explained, and how the energy of...

[Free Registration/Login may be required to access all resource tools.] The second stage of photosynthesis, the Calvin Cycle, is described. Students will learn how to write the overall photosynthesis equation, explain RuBisCo, describe...

[Free Registration/Login may be required to access all resource tools.] Tutorial serves as an introduction to chromosomes. It defines genes, chromosomes, and homologous chromosomes, while providing an explaination of chromatids and...

[Free Registration/Login may be required to access all resource tools.] No matter what the cell, all cells come from preexisting cells through the process of cell division. This module provides an overview of cell division in prokaryotes...

[Free Registration/Login may be required to access all resource tools.] Cell division is just one of several stages that a cell goes through during its lifetime. Students will learn about the phases of the cell cycle, specifically the...

[Free Registration/Login may be required to access all resource tools.] A description of the stages of eukaryotic cell division, a summarization of mitosis and the metaphase plate, an explanation of the function of the centrioles and the...

[Free Registration/Login may be required to access all resource tools.] How do you make a cell with half the DNA? Meiosis. This activity outlines the phases of meiosis, provides an overview of sexual reproduction, and describe how...

[Free Registration/Login may be required to access all resource tools.] Did you know the ostrich egg is just one cell? Tutorial describes the process of gametogenesis. and also compares and contrasts spermatogenesis and oogenesis.

Genetic variation helps ensure the survival of a species. It is this variation that is the essence of evolution. Without genetic differences among individuals, "survival of the fittest" would not be likely. This activity discusses how...

[Free Registration/Login may be required to access all resource tools.] This module states and explains the central dogma of molecular biology which was conceived by Francis Crick.

[Free Registration/Login may be required to access all resource tools.] DNA is the genetic material in your cells passed on to you from your parents and determines your characteristics. Learn about transformation and how DNA was...

[Free Registration/Login may be required to access all resource tools.] Module describes how DNA's structure and function was discovered while summarizing the process of DNA replication. This activity also explains Chargaff's rules and...

[Free Registration/Login may be required to access all resource tools.] An overview of RNA, its three main types and their functions are discussed in this tutorial. After completing this activity, students will be able to compare DNA to...

[Free Registration/Login may be required to access all resource tools.] The process of transcription is defined and discussed in protein synthesis. Students will learn about mRNA processing and know the significance of polyadenylation.

[Free Registration/Login may be required to access all resource tools.] How do you go from four letters to 20 amino acids? You need a code. This module introduces the genetic code and how to read it, defines codon and reading frame, and...