Phospholipid molecules - Study guides, Class notes & Summaries

BIO-1402- CH. 22 the Origin and History of Life Questions and Answers 100% Pass Cell Theory 1. All organisms are composed of cells 2. Cells are the smallest living things 3. Cells arise only from pre-existing cells What are the required minimal set of macromolecules protobionts must have? 1. Self- replicating lipid vesicles 2. Self-replicating genetic material. Plausible progression of Cells 1. Formation of organic molecules (spontaneous) 2. Formation of organic polymers 3. ...

Bio 189 Midterm Study Guide Questions and Answers Rated A+ What role do telomeres play in cellular aging? Telomeres protect the ends of chromosomes from deterioration or fusion with neighboring chromosomes, and their shortening during cell division is associated with cellular aging and limit the number of times a cell can divide. Describe how the structure of the phospholipid bilayer contributes to its function. The phospholipid bilayer's hydrophilic (water-attracting) heads face...

TEST BANK ANATOMY AND PHYSIOLOGY OPENSTAX Table of Contents 1. An Introduction to the Human Body ................................................................................................................. 2 2. The Chemical Level of Organization ................................................................................................................ 7 3. The Cellular Level of Organization ..................................................................................................

(from the Greek, meaning cell-eating) involves the formation of an enormous membrane vesicle called a phagosome, or phagocytic vacuole, which engulfs a large particle such as a bacterium. *Only certain kinds of cells can carry out phagocytosis. - Phagocytosis 1. What is the difference between potential and kinetic energy? - -Kinetic energy is energy associated with movement, such as the movement of a baseball bat from one location to another. By comparison, potential energy is the energy th...

Bio 104 Module 2 Questions and Answers Already Passed What specific type of protein in the plasma membrane is involved in cell signaling? Receptor proteins. What term describes the balance of molecules on either side of a cell membrane after diffusion? Equilibrium. What is the term for the cellular process that engulfs fluids from the surrounding environment? Pinocytosis. Which part of the cell membrane is primarily responsible for its selective permeability? Phospholipid ...

AP Bio FRQs Latest Version 2024/2025 Graded A+ Based on the model, explain whether the molecules shown crossing the membrane require energy to do so. The response indicates that energy is not required for the substances to cross the membrane because the substances are being passively transported from a region of higher concentration to a region of lower concentration. Depending on the organism, the optimal pH for enolase to catalyze its reaction is between 6.5 and 8.0. Describe how ...

IB Bio A1.1 Water Questions and Answers Graded A+ List reasons why water is a substance on which life depends. A1.1.1 - Water as medium of life. 1. The first cells originated in water. 2. Water is the "universal solvent" allowing it to dissolve and transport molecules around a body. 3. Water is a metabolite in condensation and hydrolysis reactions. 4. Water is a temperature buffer in bodies and ecosystems. 5. Water maintains biological structures (such as phospholipid bilay...

Biology 1001 LSU Hrincevich Exam 3 Questions and Answers Already Passed **1. Growth factors primarily stimulate:** - (A) The production of cyclins. - (B) The cell to skip the S and G1 phases of interphase and undergo mitosis directly. - (C) Cdk's to synthesize enzymes that digest cyclins. - (D) The cell to ignore the checkpoints of the cell cycle. - (E) None of the above. **2. A key distinction between mitosis and meiosis is:** - (A) Meiosis produces two daughter cells, while mito...

A phospholipid molecule has 1. a hydrophilic head that is repelled by water. 2. hydrophilic tails that are repelled by water. 3. a hydrophilic head that is attracted to water. 4. a hydrophobic head that is repelled by water. 5. hydrophobic tails that are attracted to water. - a hydrophilic head that is attracted to water. A cell membrane is not 1. a fluid structure. 2. a rigid structure. 3. a mosaic structure. 4. a bilayered structure. 5. composed of phospholipid molecules. - a rigid ...

BIO 100 EXAM 2 LATEST VERSION GRADED A+ LECTURE#6 Cell Communication **What is the role of the plasma membrane in a cell?** The plasma membrane acts as the "gatekeeper" of the cell, separating it from its environment and regulating the passage of molecules. It is composed of a hydrophobic phospholipid bilayer that allows small and hydrophobic molecules to pass through. **What are concentration gradients in cellular context?** Concentration gradients refer to the differences in...