Presentation on theme: "Table of Contents Photosynthesis Respiration Cell Division Cancer."— Presentation transcript:
1Table of ContentsPhotosynthesisRespirationCell DivisionCancer
2Sources of Energy - Photosynthesis Nearly all living things obtain energy either directly or indirectly from the energy of sunlight captured during photosynthesis.
3The Photosynthesis Process Activity Click the Active Art button to open a browser window and access Active Art about the photosynthesis process.
4The Two Stages of Photosynthesis During photosynthesis, plants and some other organisms use energy from the sun to convert carbon dioxide and water into oxygen and sugars.
5Steps in Photosynthesis SequencingSequence is the order in which the steps in a process occur. As you read, create a flowchart that shows the steps in photosynthesis. Put each step in a separate box in the flowchart in the order in which it occurs.Steps in PhotosynthesisSunlight strikes leaf.Chlorophyll captures light energy.Cells use the energy to produce sugars and oxygen from water and carbon dioxide.
6Click the Video button to watch a movie about photosynthesis.
8Two Stages of Respiration During respiration, cells break down simple food molecules such as sugar and release the energy they contain.
9Photosynthesis and Respiration You can think of photosynthesis and respiration as opposite processes.
10Using Prior Knowledge - Respiration Your prior knowledge is what you already know before you read about a topic. Before you read, write a definition of respiration in a graphic organizer like the one below. As you read, revise your definition based on what you learn.What You KnowRespiration is when an organism breathes in oxygen because oxygen is needed by cells.What You LearnedRespiration also means the process in which cells break down simple food molecules such as sugar and release the energy they contain.
11Click the Video button to watch a movie about respiration.
12Links on Cellular Respiration Click the SciLinks button for links on cellular respiration.
16Cell Cycle Activity - Cell Division Click the Active Art button to open a browser window and access Active Art about the cell cycle.
17Length of the Cell Cycle - Cell DivisionLength of the Cell CycleHow long does it take for a cell to go through one cell cycle? It all depends on the cell. A human liver cell, for example, completes one cell cycle in about 22 hours, as shown in the graph. Study the graph and then answer the following questions.
18Length of the Cell Cycle - Cell DivisionLength of the Cell CycleReading Graphs:What do the three curved arrows outside the circle represent?The longest curved arrow represents the cell’s interphase; the shortest represents cytokinesis; and the middle one represents mitosis.
19Length of the Cell Cycle - Cell DivisionLength of the Cell CycleReading Graphs:In what stage of the cell cycle is the wedge representing growth?Interphase
20Length of the Cell Cycle - Cell DivisionLength of the Cell CycleInterpreting Data:In human liver cells, how long does it take DNA replication to occur?10 hours
21Length of the Cell Cycle - Cell DivisionLength of the Cell CycleDrawing Conclusions:In human liver cells, what stage in the cell cycle takes the longest time?Interphase
22Structure of DNA - Cell Division The DNA molecule is shaped like a twisted ladder.
23Replication of DNA - Cell Division Because of the way in which the nitrogen bases pair with one another, the order of the bases in each new DNA molecule exactly matches the order in the original DNA molecule.
24Sequencing - Cell Division As you read, make a cycle diagram that shows the events in the cell cycle, including the phases of mitosis. Write each even in a separate circle.The Cell CycleCell grows, makes a copy of DNA.Cell pinches in two; each daughter cell has same number of identical chromosomes.Chromosomes and spindle fibers form; nuclear envelope breaks down.Chromosomes stretch out; new nuclear envelope forms around chromosomes.Chromosomes line up across the center and attach to a spindle fiber.Centromeres split; chromatids separate and move to opposite ends.
26- CancerWhat Is Cancer?Cancer is a disease in which cells grow and divide uncontrollably, damaging the parts of the body around them.
27Previewing Visuals - Cancer When you preview, you look ahead at the material to be read. Preview Figure 17. Then write two questions you have about the illustrations in a graphic organizer like the one below. As you read, answer your questions.How Cancer SpreadsQ. What is a tumor?A. A mass of abnormal cells that develops when cancerous cells divide and grow uncontrollably.Q. How does cancer spread?A. Some of the tumor cells can break off and enter the bloodstream.
30Comparing Photosynthesis and Respiration Graphic OrganizerComparing Photosynthesis and RespirationFeaturePhotosynthesisRespirationWater and carbon dioxideRaw materialsOxygen and sugarsWater and carbon dioxideProductsOxygen and sugarsIs energy released?NoYes