Answers / ______
BlockFirst AND Last Name
B1.1)Identify various characteristics of living things
B1.2)Relate these characteristics to viruses, bacteria, plants, and animals
B2.1)Summarize cell theory
Characteristics / Example
Living things are composed of cells. All cells are similar. / Every plant cell has features similar to other plant cells.
Living things respond to the environment. Their response might be to another organism or to many other factors / A wolf kills a rabbit to so that the wolf can stay warm in the winter.
Living things reproduce, grow, and repair themselves. / Cells reproduce by dividing in two. New cells are needed for growth and repair.
Living things have a life span. / People exist only for a limited period of time.
Living things require energy. / Almost all plants get the energy that they need from the Sun. Animals get the energy that they need by eating plants, or by eating other animals that got their energy from plants.
Living things produce waste. / Your kidneys filter waste from your blood.
B2.2)Accurately list similarities and differences between cell types
B2.4)Recognize and name parts of a cell
B2.3)Describe the structure and function of cell organelles
Structure / Function
Nucleus / Control centre of all the cell's activities
Chromosomes / Contain DNA (genetic information) which is a construction plan for all pieces of the cell.
Cell membrane / Holds the contents of the cell in place. Selectively lets certain things in and certain things out of the cell.
Cytoplasm / Watery fluid that contains everything inside the cell membrane.
Vacuole / Stores water and nutrients and waste.
Flagellum / Whip-like tail that helps the cells to move. (Not found in all cells)
Cilia / Tiny hairs that move a cell or move the fluid surrounding the cell. (Not found in all cells)
Cell wall / Protects and supports the plant cell. (Only found in plant cells.)
Chloroplast / Contain chlorophyll which allows plant cells to make their own food with light, carbon dioxide and water. (Only found in plant cells.)
B2.4)Relate the concepts of osmosis and diffusion to transport of materials across cell membranes
1)Diffusion is the movement of moleculesfrom an area ofhigh concentration to an area of lower concentration. Waste products, such as carbon dioxide, tend to become more concentrated inside the cell than outside, so they diffuse out of the cell.
2)Osmosis is the diffusion of water through a selectively permeable membrane. The direction of water movement depends on the concentration of water inside the cell compared with the concentration outside of the cell.
Study Guide:Read Science Probe 8pages5-6, 10-13, 22-24, and 25-28.
Practice Test:
1)Give an example of each of the characteristics of life:(1) Living things are composed of cells. All cells are similar; (2) Living things respond to the environment. Their response might be to another organism or to many other factors; (3) Living things reproduce, grow, and repair themselves; (4) Living things have a life span; (5) Living things require energy; (6 ) Living things produce waste.
2)Identify the structure and functionthe parts of a cell:Nucleus; Chromosomes; Cell membrane; Cytoplasm; Vacuole; Flagellum; Cilia; Cell wall; Chloroplast.
3)Explain how materials are transported across cell membranes: Diffusion; Osmosis
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