Introduction:
Cells are regarded as the simplest unit (structural and functional) of life. Cellular membrane, nucleus, and cytoplasm are the three major components of a cell. Cellular membrane which surrounds the entire cell is composed of phospholipids and proteins. The nucleus is bound by a nuclear membrane and it possesses the genetic material of the cell. Cytoplasm consists of organelles, cytoskeleton (filaments and tubules), and inclusion bodies. Protoplasm denotes all living materials that are present in the cell enclosed by the cellular membrane (inside and outside the nucleus).
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Chapter 3 Solutions
LSC (CONCORDIA UNIV ST PAUL) BIO 315/316: B&N DPF Connect with APR and Phils Online Access for Anatomy and Physiology: The Unity of Form and Function 180 Day Access ENTRP
- Flippases help maintain membrane asymmetry. True Falsearrow_forwardBecause the plasma membrane is selectively permeable, nothing can diffuse through the bilayer. True or Falsearrow_forward"Tight junctions perform two distinct functions: they seal the space between cells to restrict paracellular flow and they fence off plasma membrane domains to prevent the mixing of apical and basolateral membrane proteins" is true or false.arrow_forward
- How are tight junctions formed? By the tight fusion of____________________arrow_forwardIons like K+ cannot diffuse directly across the membrane. They need open ion channels to cross the membrane. Explain why.arrow_forwardsodium rushing into the cell, making the potential difference positivearrow_forward
- When would a carrier protein be required in order to allow a solute to diffuse across a plasma membranearrow_forwardWhen a person becomes dehydrated, the amount of water in extracellular fluids such as blood decreases, causing the solute concentration of these fluids to increase. State whether osmosis results in water entering or leaving cells.arrow_forwardDescribe fats and oils, and what makes triglycerides solid (fats) or liquid (oils). List examples of lipids except fats and oils (triglycerides). What is the main material of the plasma membrane? (draw a schematic figure) Describe micelles and liposomes (if needed, draw a figure). The plasma membrane is ___________permeable. Describe how an active transport works (with an example _________ channel). In the Na+/K+ channel, how many ions move across the membrane?arrow_forward
- Cotransport is ____________ movement of water down concentration gradient using a protein channel movement of materials against their concentration gradient movement of one substance against, and one substance down their concentration gradients movement of molecules from high concentration to low concentration using no protein channels movement of materials down their concentration gradient using a protein channelarrow_forwardIdentify how each of the following would pass through the plasma membrane: gases, large polar molecules, charged molecules (like ions), hydrophobic molecules, and small polar molecules. Be specific.arrow_forwardWhat type of ion channel contributes to the restingmembrane potential? Describe the permeabilitycharacteristics of the plasma membrane.arrow_forward
- Human Physiology: From Cells to Systems (MindTap ...BiologyISBN:9781285866932Author:Lauralee SherwoodPublisher:Cengage Learning
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