1. Essential Question: Why do organisms go through cell division? Science 7

2. Next Science Test: “Cell Division” Unit Test Wednesday, December 9 Study guide is also posted online

3. Homework: Science It is recommended that you complete “SLIDE 2-4” from your “Cell Division” unit review slide presentation over the weekend

4. Most Missed Question: Review of the Day Multicellular organisms grow because: A. the number of cells that make them increases over time B. the cells of the organisms swell up and grow larger C. the organisms stretches out and becomes less dense

5. Most Missed Question: Review of the Day Which of the following DOES NOT provide a reason that multicellular organisms go through cell division? a. to get rid of waste b. in order to grow c. in order repair themselves d. in order to develop new kinds of cells

6. Most Missed Question: Review of the Day All members of the same species of organism have the same number of chromosomes (excluding genetic mutations). A. True B. False

7. Layers of the Atmosphere Review: Altitude Distance above sea level In what layer of the atmosphere is the Ozone Layer located? As altitude increases, the density of air __________.

8. What causes the Coriolis Effect (the curving of global winds)

9. Key Atmosphere Concepts that you MUST know! As the temperature of air heats up, the air __________ (in other words, it becomes ______ dense) As the temperature of air cools down, the air __________ (in other words, it becomes _______ dense) As Air Density Increases, Air pressure also _________________ As Air pressure Decreases, air density also _________________ The most common gas in the atmosphere (76%) is ___________________ The second most common gas (22%) in the atmosphere is ________________.

10. Key Atmosphere Concepts that you MUST know! Fluids (such as air) move from areas of ________ pressure to areas of ________ pressure Air pressure is different in different places on Earth because… Air moving from areas of high pressure to areas of low pressure parallel to Earth’s surface is called _____. The measurement of how much water vapor is in the air is called ________________. The warmer air is, the ______________ humidity it can hold. When water vapor condenses on dust particles in the atmosphere, ___________ are formed

11. Key Atmosphere Concepts that you MUST know! A drop in air pressure in an area indicates a _____________ front. A rise in air pressure in an area indicates a ____________ front. Hurricanes always form near the ___________________. Tornadoes almost always form on the continent of __________ ________.

12. Characteristics of Living Things: Vocabulary A living thing-- this is an individual example of a specific species of living thing. ORGANISM

13. Characteristics of Living Things: Vocabulary There are seven characteristics that all living things share with one another: All living things RESPIRATE All living things EXCRETE waste All living things require NUTRIENTS All living things GROW All living things REPRODUCE All living things are SENSITIVE to their environment All living things MOVE ***Of course within any species, there are injuries or problems with the body that can cause one of these features to not work properly– this does not mean that the organism isn’t “alive”. For instance, a dog who has had its reproductive organs removed (spayed or neutered) is not suddenly a “non- living thing”

18. Key Cell Theory Concepts that you MUST know! All living things are made of _______________. An organism made of one cell is called a __________________ organism. An organisms made of many cells is called a _________________ organism Cells with no nucleus or organelles are called __________________ cells. Cells with a nucleus and organelles are called ___________________ cells. Cell theory of biology can be summarized with three statements: _______________________________

19. Key Cell Theory Concepts that you MUST know! When the mitochondria use oxygen to break apart sugar (glucose) to release energy, they are carrying out the process of _______________ ______________. The waste products of cellular respiration are ______________ and __________. When the chloroplast uses water, sunlight, and carbon dioxide to make sugar (glucose), it is carrying out the process of _____________________. The products produced by photosynthesis are ______________ and ___________. When water moves through the cell membrane from areas of high concentration to areas of low concentration, the process of __________________ is taking place.

20. Cell Division: Vocabulary This is the generalized name for the process of cells splitting into two new cells. It is where new cells come from. CELL DIVISION

21. Today’s Topic: Why do organisms go through cell division?

22. Cell Division: Vocabulary This is the generalized name for the process of cells splitting into two new cells. It is where new cells come from. CELL DIVISION

23. Cell Division: Vocabulary Unicellular organisms go through cell division in order to… REPRODUCE Multicellular organisms go through cell division in order to… GROW REPAIR THEMSELVES CREATE NEW KINDS OF CELLS

24. Cell Division: Vocabulary This is a chemical that stores all of the genetic information that makes an organism what it is. It is found inside the nucleus of eukaryotic cells. DEOXYRIBONUCLEIC ACID (DNA) These are large bundles of DNA that wrapped up inside the nucleus. An organisms DNA is divided into several of these. CHROMOSOMES

25. Cell Division: Vocabulary This is a chemical that stores all of the genetic information that makes an organism what it is. It is found inside the nucleus of eukaryotic cells. DEOXYRIBONUCLEIC ACID (DNA) These are large bundles of DNA that wrapped up inside the nucleus. An organisms DNA is divided into several of these. CHROMOSOMES

26. Cell Division: Vocabulary All members of the same species of organism have the same number of chromosomes (ignoring genetic mutations) Different species, however, have different numbers of chromosomes. For example, humans have 46 chromosomes, but fruit flies have 8 chromosomes. Every cell in an organism (with one exception) contains the entire set of that organisms DNA/Chromosomes

27. Yesterday’s Topics: Why do unicellular organisms go through cell division? Why do multicellular organisms go through cell division? Humans have ______ chromosomes. Do all living things have the same number of chromosomes?

28. Exit Ticket: Access the “Exit Tickets” page of DeBolt’s wiki Click on the link for today’s exit ticket Complete the quiz before leaving class Name format: “your period number, Last name, First name”