Lesson 1 Key Questions 1. Mg2+ has 10 electrons 2. Given that the half life of the radioisotope carbon -14 is 5730 years‚ it would not be useful in dating bones that are over a million years old. After 40 000 years of age less than 1% of the 14C is left in the bone and thus it is not useful for determining the exact age beyond that. 3. Hydrolysis - A chemical reaction where a chemical is broken down by a reaction with water. Hydrolysis is important for the digestion of food‚ making
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| | Answers are attached Enjoy Biology‚ 8e (Campbell) Chapter 7 Membrane Structure and Function Multiple-Choice Questions 1) Who was/were the first to propose that cell membranes are phospholipid bilayers? A) H. Davson and J. Danielli B) I. Langmuir C) C. Overton D) S. Singer and G. Nicolson E) E. Gorter and F. Grendel 2) Who proposed that membranes are a phospholipid bilayer between two layers of hydrophilic proteins? A) H. Davson and J. Danielli B) I. Langmuir
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ANATOMY & PHYSIOLOGY I WORKSHEET I Plasma Membrane and Cellular Transport Structure of the Plasma Membrane 1. Why do you think it is important to have a membrane surrounding each of our trillions of cells? Expect varying answers‚ but the idea is have the students understand the plasma membrane separates the cells from their environment and each other while also regulating the material within each cell. 2. What are two distinctive physical features of phospholipids? Heads are polar (water soluble
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piece had 1.00% increase over the 6g piece‚ but that may have changed if we continued the experiment for a longer time. We also learn from the data that at 0.5M sucrose‚ the potato piece is hypotonic because it lost weight‚ but at the control (water)‚ 0.1M sucrose‚ and 0.05M sucrose‚ the potato piece is hypertonic because the potato pieces gained weight. There are some discrepancies in the data as seen by the control‚ but overall it supports our hypothesis of the smaller potato piece having a faster
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Osmosis – When water molecules move concentration to level out. Osmotic pressure – The pressure forced upon the membrane by a solution with a solute that cannot pass through. Isotonic Solution – A solution where the concentrations of solutes that cannot pass through the plasma membrane are the same on both sides. Hypotonic Solution – A solution that has a lower concentration of solutes than the cytosol inside red blood cells. Hemolysis – The
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proteins can do? 5. What do are the criteria a particle must have to simple diffuse through the lipid bilayer? 6. What’s the difference between facilitated diffusion and simple diffusion? 7. What’s osmosis? 8. What’s the meaning of hypertonic‚ hypotonic‚ isotonic? Give examples if a RBC (red blood cell) was place in each type of solutions. 9. What’s plasmolysis and turgor pressure? 10. Compare and contrast the active transport of the sodium and potassium pump and the sodium glucose co transport
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The purpose of this lab was to hypothesize about membrane traffic in lab‚ explain the differences between the solutions hypertonic‚ hypotonic‚ and isotonic and how they respond using the understanding of the cell membrane structure‚ types of transport mechanisms such as active‚ passive‚ diffusion‚ osmosis‚ and explain the movement of particles moving across the cell membrane. In this lab was divided into two parts. The first part was varying the concentration and the second part was varying the temperature
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the molecules are delimited to move across the gradient‚ causing osmosis to slow down). In addition‚ pure water is always hypotonic solution‚ meaning that the pure water will cross the vegetables’ semipermeable membrane and level the concentration on both sides. Nevertheless‚ isotonic solutions eventuate when the two solutions emulate each other at equilibrium‚ and hypertonic solution is the propensity for water to flow out of the cell to help balance the concentration of the
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Lecture: Plasma Membrane and Transport I. Structure of the Plasma Membrane A. plasma membrane - the surface encapsulating a cell B. Fluid Mosaic Model 1. bilayer of phospholipids a. hydrophilic heads - P04 end "water" "loving" attracted to water on inner/outer parts of cell b. hydrophobic tails - fatty acids "water" "fearing" attracted to each other on inside of bilayer c
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