Name Period Chapter 7: Membrane Structure and Function Concept 7.1 Cellular membranes are fluid mosaics of lipids and proteins 1. The large molecules of all living things fall into just four main classes. Name them. Explain what is meant when we say a molecule is amphipathic. 3. In the 1960s‚ the Davson-Danielli model of membrane structure was widely accepted. Describe this model and then cite two lines of evidence that were inconsistent with it. 4
Premium Cell membrane Membrane biology Signal transduction
ways across the membrane through the dialysis bag pores. Since both sides were water‚ there was a small amount of net movement. However‚ considering both sides were both water‚ there should have been roughly no net movement because the solution was isotonic‚ not an increase of roughly five percent. For the 0.2‚ 0.4‚ 0.6 0.8‚ and 1.0 Moles of sucrose solutions‚ the bag gained mass. The water had to diffuse across the membrane into the bag to space out the sucrose molecules because the beaker contained
Premium Cell membrane Protein Cell
Name: Jojo Cohen Date: 12-8-17 Cell Transportation Overview Directions: Read page 362-374 and use your notes to help you answer the following questions. 1. Illustrate and describe the structure of the cell membrane using figure 2.8 on page 362. 2. What does selectively permeable mean (pg. 363)? A: Selectively permeable means that some substances can pass through the cell membrane while others cannot pass through. 3. What is diffusion and why does it occur? A: The movement of solutes
Premium Cell membrane Osmosis Diffusion
Rate of Osmosis vs Solute Concentration Introduction: In nature‚ the quest to reach equilibrium‚ or the state of rest or balance due to the equal action of opposing forces (http://www.dictionary.com). Osmosis and diffusion are two ways that cells reach this equilibrium‚ without exerting energy. Due to the unique nature of the phospholipid bilayer‚ small molecules can pass through the semipermeable membrane easily‚ through diffusion (https://www.biologycorner.com). Water‚ however‚ has a slightly more
Premium Osmosis Concentration Diffusion
is osmosis. Osmosis is the diffusion of water across the cell membrane. Three examples of osmosis are hypertonic‚ hypotonic‚ and isotonic solutions. A hypertonic solution is a solution that has a higher concentration of dissolved particles than another solution. A hypotonic solution is a solution that has lower concentration of dissolved particles compare to another solution. Lastly an isotonic solution is a solution that has an equal concentration of dissolved particles compared to another solution
Premium Cell Cell membrane Membrane biology
solutes relative to one another ___B__ the movement of molecules across a selectively permeable membrane with the aid of specialized transport proteins a. diffusion b. facilitated diffusion c. osmosis d. active transport e. hypotonic f. isotonic g. hypertonic 2. What is the main difference between simple diffusion and facilitated diffusion? FACILITATED IS MOVEMENT WITH THE HELP OF CARRIER PROTEINS 3. What is the main difference between facilitated diffusion and active transport
Premium Osmosis Diffusion Semipermeable membrane
faster‚ concentration occurs because the higher the concentration of the sucrose the faster the rate of osmosis occurs. In the experiment there are 3 other reactions that are present are hypertonic‚ hypotonic and isotonic. Hypertonic is when the cell loses water‚ hypotonic is when the cell gains water and isotonic is when the cell does not gain or lose water. I predict that each cell will become heavier and heavier after each weigh in every 10 minutes. The experiment that my lab partners and I did
Premium Osmosis Semipermeable membrane Solution
sheep blood in an isotonic solution Slide#3 1. Place 1 drop of 10% NaCl solution onto the slide
Premium Water Bacteria Oxygen
plant cell is bathed in a solution of the same concentration (isotonic) as its intracellular environment‚ its mass and volume remain the same. This is because water enters and leaves the cells at the same rate. There is no net loss or gain of water by osmosis. Samples of cells can be placed in a range of solutions of different concentration. The cells will gain water by osmosis when placed in solutions which are more dilute (hypotonic) than the intracellular environment. They will therefore gain
Premium Concentration Osmosis Potato
Nucleus- The nucleus is the control center of the cell. This is where DNA is contained. This is like the town hall or the mayor’s office because it is the control center of a town. The nucleus uses DNA like a city uses blueprints to direct the production of protein. Nucleolus- The nucleolus is where ribosome is made and is rich in RNA content. It is located inside the nucleus. A mayor is like this because the mayor makes everything in the town happen. He also works from the town hall‚ or works
Premium Cell Organelle