Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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- The following table depicts the rate of transport of a molecule into a cell as the external concentrations are changed. Based on what you know about the characteristics of membrane transport, the molecule is most likely transported by: a) passive transport b) simple diffusion across the membrane c) facilitated diffusion d) active transportarrow_forwardThe diagram below shows three different proteins embedded in a cell membrane, as well as the concentration gradient surrounding the cell high concentration channel protein carrier protein lipid bilayer 1 21 3 low concentration Which of the following statements correctly states the process shown in the diagram? O The process labeled 1 shows how cells can easily move molecules with the concentration gradient using high energy molecules. The process labeled 2 shows how cells move molecules against the co entration gradient without needing hic energy molecules The process labeled 3 shows how cells use energy to facilitate the active transport of molecules against the concentration gradient All three processes show how molecules freely move in and out of the cell regardless of the concentration gradient or available en Previousarrow_forwardPlease explain why it's true or falsearrow_forward
- If GTP hydrolysis occurs on a tubulin molecule at the plus end of a microtubule protofilament before another tubulin molecule is added, what typically happens? the GDP is rapidly exchanged for a fresh molecule of GTP the microtubule depolymerizes the microtubule polymerizes the microtubule is stabilized the protofilaments assemble into a hollow tubearrow_forwardWhat is the role of lysozyme and a low ionic strength extraction buffer? Select all that apply. Cells absorb water from a low ionic strength extraction buffer, by osmosis, swell and lyse, releasing their contents Lysozyme breaks down bonds in the cellulose cell wall of plants, weakening the structure Cells release water into a low ionic strength extraction buffer by osmosis, shrink and lyse, releasing their contents Lysozyme is an enzyme found in lysosomes in cells Lysozyme breaks down bonds in the peptidoglycan cell wall of bacteria, weakening the structure Lysozyme is an antibiotic found in tears, saliva, human milk and mucus.arrow_forwardwhich of the following changes in the plasma membrane of a salmon is most likely to occur as it migrates to a much colder region of the Pacific Ocean? HInt: the fluidity of the salmon's plasma membranes must remain relatively constant during its migration. The percentage of integral membrane proteins in the plasma membrane would increase The percentage of unsaturated fatty acid tails in plasma membrane phospholipids would increase The percentage of unsaturated fatty acid tails in plasma membrane phospholipids would decrease The percentage of peripheral membrane proteins in the plasma membrane would increasearrow_forward
- Mark the flow of water with an arrow for cells that have been placed in solutions of differing tonicity. Indicate what will happen to a plant and animal cell under each of these conditions. Direction of osmosis Plant cell Animal cell shape shape minor swelling The solute concentration outside the cell is isotonic (or equal) to the inside of the cell. No change swelling and lysis plasmolysis crenation Reset Zoom (a) Outside isotonic The solute concentration outside the cell is hypertonic to the inside of the cell. (b) Outside hypertonic The solute concentration outside the cell is hypotonic to the inside of the cell. (c) Outside hypotonic Oo Solute Cytosol ©2018 McGraw-Hill Education. Check marrow_forwardCan these molecules cross into a cell? If yes, with what transport type? Molecule 3 an ion, with an external concentration of 10mM and an internal concentration of 1mM. Molecule 4 a large nonpolar, with an external concentration of 10mM and an internal cellular concentration of 100μM.arrow_forwardSome cells in the pancreatic acinus form vesicles containing zymogens. Then the cells secrete the zymogens. Certain proteins called v-SNARES play a role in this process. What best describes the proteins called v-SNARES? a.) v-SNARES are proteins on the cytosolic face of the plasma membrane that help vesicles to fuse with the plasma membrane b.) v-SNARES are a type of glycosphingolipid in the vesicle lipid bilayer that help maintain vesicle integrity c.) v-SNARES are proteins on the surface of vesicles that help the vesicle fuse with the cytosolic face of the plasma membrane d.) v-SNARES are proteins contained inside of vesicles that help stabilize the vesicle contents until the vesicle fuses with the cytosolic face of the plasma membranearrow_forward
- After pinocytic vesicles fuse with early endosomes, one possible fate of both cargo receptors and their cargo could be translocation to a new plasma membrane location, followed by exocytosis of the cargo molecule, which commonly occurs in human gut epithelial cells carrying which cargo? the human immunodeficiency virus (HIV) the glucose molecule the low density lipoprotein (LDL) the influenza virus the cholesterol moleculearrow_forwardthe structure of the plasma membrane is best described as: two layers of phospholipids stacked on top of each other, with proteins embedded in the phospholipids Oa single layer of proteins and polysachharides mixed together two layers of proteins stacked on top of each other O many sheets of peptidoglycan stacked on top of each other O one layer of triglycerides on top of a layer of proteinsarrow_forwardClathrin-coated vesicles are used during which transport process? Receptor-mediated endocytosis trans-Golgi to medial-Golgi transport Trans-Golgi network to lysosome trafficking Receptor-mediated endocytosis and trans-Golgi network to lysosome trafficking ER to Golgi protein traffickingarrow_forward
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