In this bacteria activity, students read several elements of bacterium cells, their diet, types, locations, reproduction, resting stages, effects of, and classification. Students also study a cross-section of bacterium cells.

Starting with a diagram of the kidneys and urinary tract of the human, this sheet has questions about excretion, blood concentrations of hormones, gland feedback mechanisms and the effects of some hormones.

In this science worksheet, students answer 13 multiple-choice questions about mitosis and meiosis. For example, "Interphase is defined as..."

In this crossword puzzle worksheet, 7th graders read the definitions that relate to the protista kingdom and then complete the crossword puzzle.

Learners determine which cell organelles have a similar function to different places in a city.

A teacher- and student-contributed website of 3-D models and explanations of cell structures.