Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.

In this animated object, learners examine how the heating or cooling steps in a manufacturing process work to control a chemical reaction.

Students review the rule for writing the possessive form of singular nouns that end in an "s" sound. They then complete exercises.

Students read about how to make the plural form of nouns that end in "y." They then complete an exercise.

Students read about how to make the plural form of nouns that end with "f" or "fe." They then complete an exercise.

Students review the rule for pluralizing nouns ending in the letter "o." They then complete an exercise.

In this accounting learning object, students follow the steps involved in the closing process. Temporary accounts contain ending balances for a specified period and must be closed.

In this screencast, learners examine the properties of the peptide bond and how the bond relates to the structure of hair.

In this screencast, learners read about the seven hormones that help regulate blood glucose.

Learners identify nine glands in a matching exercise.

Learners answer questions about medication from a game board with the headings "Pituitary," "Thyroid," and "Adrenal." Up to three people can play at one time. Contestants "buzz in" their answers to accumulate points.

In this animated object, learners examine the major events that occur at the neuromuscular junction.

In this animated and interactive object, learners follow two methods for converting a hexadecimal number to a decimal number. They test their knowledge in exercises at the end of the learning object.

By the end of this module, you’ll be able to:

- List four categories of disease agent sources

- Discover conditions when disease transmission is likely to occur

- Describe the means of disease transmission in a given situation

Students explore the history of U.S. Constitutional amendments and the process involved in adding an amendment. In an interactive exercise, learners author their own amendments and explain why these should be added to the Constitution.

Learners practice identifying land sections using land survey terms and maps. Feedback is provided at the end of the activity.

In this interactive lesson, learners read and hear instructions for sending an e-mail. Steps are given for composing an e-mail message and for sending it. Students have an opportunity to write their own messages. A quiz follows the instruction.

Learners answer 20 questions related to discouraging intoxication in an establishment. The questions are presented in a game show format, and immediate feedback is provided. A final score is given at the end of the activity.

In this screencast, learners examine the bones of the appendicular skeleton.

Learners answer 20 questions related to a customer's blood alcohol content. The questions are presented in a game show format, and immediate feedback is provided. A final score is given at the end of the activity.