Grade 6 Homework:

• Read your study guide through at least one time, and 
• answer all Questions on the Reading Product Labels Activity Sheet (BOTH sides, CR!) and
• Also write "Question 11: What kind of hazard(s) does this cleaner  present?" Then write out an answer to that question.

Gr. 7 homework:

• Read your study guide through at least twice.  Make sure that you know your material for tomorrow's Mid Term. If you have questions, you can email me at mgoldsmith@ci.stamford.ct.us and I will answer you in class before the test 

End of Answers for Study Guide

• Describe the tradeoffs associated with using one power of magnification over another. 
• At a higher power, you see fewer cells, but you see those cells in greater detail.

• Explain the function of the four most common organelles.
Nucleus - reproduction and controls the cell
cell membrane - controls flow of materials in and out of cell.
mitochondria - energy factory for the cell.
cytoplasm - breaks down and allows transport of nutrients.
• Compare and contrast bacteria vs. animal cell organelles.
bacteria do not have nucelus or membrane bound organelle.
• Compare and contrast single vs. multi-celled organisms and provide examples of each.

• Multi-celled organisms have more than one cell, but they have trouble moving nutrients and oxygen around, so they developed tissues, organs and organ systems of great complexity, such as our circulatory systems with a two-pump heart (one side pumps to the body, one side pumps to the lungs), and blood that contains oxygen carrying red cells and white cells that fight foreign cells and substances. In other words, they developed cells that were more specialized in function and structure, with greater numbers of organelles (parts with their own job). Ex: Worms have less complicated breathing and digestive systems than humans, and dogs; algae has less complicated systems than trees.
• Single-celled organisms. The cell controls what nutrients, oxygen and waste go in and out of the cell, because all needed substances simply pass directly between the organism and the outside environment. No specialized cells, only one cell must perform all functions, and the organism is much more limited in what it is able to do. Ex: bacteria can't think; can't hunt, consume and digest other organism