Moving materials across the cell membrane sometimes requires energy, called active transport. This tutorial covers both primary and secondary active transport with good clear animations.

[Free Registration/Login may be required to access all resource tools.] How do trees help you breathe? This activity covers the connection between cellular respiration and photosynthesis and identifies the products and reactants of each.

[Free Registration/Login may be required to access all resource tools.] Definition of cellular respiration and its overall chemical equation. The energy changes that occur during cellular respiration, including in photosynthesis.

[Free Registration/Login may be required to access all resource tools.] Describes aerobic or anaerobic respiration.

Answer five multiple-choice quiz questions about the different types of cellular transport.

Through informational text, interactive activities, online labs, and video animations, students explore the major concepts of cell reproduction.

This interactive website about microscopes and microbes provides students with an introduction to cellular biology.

Ten meiosis problems to solve.

[Free Registration/Login may be required to access all resource tools.] Read grade-level texts, complete activities, and take assessments about cell biology.

[Free Registration/Login may be required to access all resource tools.] A variety of learning opportunuties about levels of organization in the human body. Includes videos, activities, discussion questions, and quizzes.

[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.] The steps and products of glycolysis are examined in this activity. Students will learn how and where the initial reactions of glycolysis occurs.

Answer the question wrong and you will get a brief tutorial in the right direction. Answer it right and you must know what you are talking about. Part of a larger quiz on cellular respiration.

[Free Registration/Login may be required to access all resource tools.] Sometimes cells need to obtain energy from sugar, but there is no oxygen present to complete cellular respiration. In this situation, cellular respiration can be...

[Free Registration/Login may be required to access all resource tools.] This activity explores the significance and functions of carbon and explains why carbon is essential to life on Earth. Students will investigate and explain cellular...

In this biology simulation, young scholars discover what factors influence the action of enzymes on cellular work. Students will first explore the action of enzymes through a simulation in which their hands are the enzyme "toothpickase"...