Chemical signals cell Essay

Other organelles have various functions. Draw a line to connect each organelle with its function. Plant cells have cell walls and chloroplasts. Circle the word or phrase that best completes the statement. Draw 11. The cell walls in a plant are strong and rigid / flexible and adhere to each other, which helps to support the entire plant. 12.

A cell wall and a cell membrane are different. All cells are surrounded by a ell wall / cell membrane that is rigid / flexible and interacts with the environment. Only certain cells have a cell wall / cell membrane, which is rigid / flexible and provides shape and support to cells. 13. Chloroplasts enable plants to convert soil nutrients / solar energy into energy-rich molecules that cells can use. Vocabulary Check 14. And 15. The endoplasmic reticulum is a maze of folded membranes where are produced. The mitochondria converts food into that is usable by a cell.

Section 3: Cell Membrane The cell membrane is a barrier that separates a cell from the external environment. : Cell membranes are composed of two phosphoric layers. 1. Draw a phosphoric in the box below. Label the three major parts. 2. Place a check mark in the appropriate box to show which parts off phosphoric are charged, or polar, and which parts are monopole. A cell membrane has other types of molecules embedded in the phosphoric belayed. Fill in the type of molecule that performs each function indicated in the sentences below. 3.

Fluid mosaic model 4. Selective Permeability part of the cytokines. Strengthens the cell membrane. Help materials cross the membrane and are also . Receptor help identify cell types. Choose whether the statement is true or false. 6. True / false A membrane is fluid, because the phosphoric in each layer can move from side to side, in and out of the cell, by sliding past each other, and by spinning in circles. 7. True / false A selectively permeable membrane allows all molecules to cross. Chemical signals are transmitted across the cell membrane.

Circle the word or phrase that best completes the statement. 8. A receptor / phosphoric detects a signal molecule and carries out an action in response. 9. A aligned is a molecule that acts as a receptor / signal when it binds too receptor / signal. 10. A aligned that can cross / cannot cross the cell membrane can bind to an intracellular receptor. 1 1 . A aligned that can cross / cannot cross the cell membrane can send a message to a cell by binding to / taking off a membrane receptor, which then changes shape. Vocabulary Check 12.

The fluid mosaic model describes the arrangement of the Cell Membrane that make up a cell membrane. The model includes both the fluidity of the membrane and the variety of molecules that make up the membrane. 13. Selective Permeability means that the cell membrane allows some, but not all, molecules to cross. Section 4: Diffusion and Osmosis Materials move across membranes because of concentration differences. MAIN IDEA: Diffusion and osmosis are types of passive transport. 1. The difference in the concentration of a substance from one location to another is called a _passive transport 2.

A molecule that diffuses down a concentration gradient goes from an area of facilitated concentration into an area of gradient concentration. Complete the following Concept Map about passive transport. Write the letter of each statement listed below in the appropriate box. A. The natural motion of particles b. Osmosis c. The movement of molecules down a concentration gradient d. Energy from the cell e. Diffusion 8. The higher the concentration of dissolved particles in a solution, the lower the concentration of water molecules in that solution.

Suppose you have three solutions with different concentrations of particles. Relative to the concentration of particles in a cell, one solution is isotonic, one is hypersonic, and one is hypotonic. Use this information to answer the next two questions. . The _hypersonic 10. The hypotonic solution has the highest concentration of particles. Solution has the highest concentration of water molecules. MAIN IDEA: Some molecules dispute through transport proteins . Circle Simple / Facilitated diffusion occurs across the membrane, but simple / 11. Acclimated diffusion occurs through selective transport proteins. 12. In facilitated diffusion, molecules move down a concentration gradient / against a concentration gradient. Vocabulary Check 13. The difference in the concentration of a substance from one location to another is called a osmosis . 14. People with more energy than most other people are described as hyper. A solution with a higher level of solutes than the solution it is being compared to is called isotonic facilitate means “to make easier. ” _passive transport . 15.

The word means that the transport protein makes it easier for a molecule that cannot directly cross the cell membrane to enter or exit a cell. Cells use energy to transport materials that cannot diffuse across a membrane. MAIN IDEA: Proteins can transport materials against a concentration gradient. For each of the following statements, place a check mark in the appropriate box if it is rue for simple diffusion, facilitated diffusion, or active transport. Each statement may be true for one or more of the three types of transportation. 4. All transport proteins span the _indications .

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