17. Resting membrane potential -T a) must be reversed in order for nerve and muscle to function T b) is established by differences in ion permeability leading to slight excess of positive charges on the- outside of the membrane compared to the inner membrane T c) is a characteristic of all living cells T d) All the above (a, b and c) are correct. T 18. The cell organelle that fuses with a phagocytic vesicle in macrophages and which is responsible for killing of foreign organisms is the T a) Golgi apparatus T b) lysosome c. peroxisome d. mitochondrion T 19. The cell organelle that packages material for secretion to the outside of the cell is the a) Golgi apparatus T b) lysosome c. peroxisomeT d. mitochondrion T

17. Resting membrane potential -T a) must be reversed in order for nerve and muscle to function T b) is established by differences in ion permeability leading to slight excess of positive charges on the- outside of the membrane compared to the inner membrane T c) is a characteristic of all living cells T d) All the above (a, b and c) are correct. T 18. The cell organelle that fuses with a phagocytic vesicle in macrophages and which is responsible for killing of foreign organisms is the T a) Golgi apparatus T b) lysosome c. peroxisome d. mitochondrion T 19. The cell organelle that packages material for secretion to the outside of the cell is the a) Golgi apparatus T b) lysosome c. peroxisomeT d. mitochondrion T

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 14RQ: Active transport must function continuously because_______. a. plasma membranes wear out b. cells...

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Cells transporting substances across their membranes is essential. Choose TWO of the following types of cellular transport. ๏osmosis ๏active transport (b)Using the same transport types, identify a specific cell that utilizes that type of transit (i.e. one cell for each transport type, or two different cell examples), and detail a substance that is transferred. (c)A typical human lymphocyte has a radius of about 10 μm, while a typical bacterium (e.g., S. pneumoniae) has a radius of about 1 μm. Assuming that both cell types are perfectly spherical, compare and contrastthe transport mechanisms for each of these cells.
Dr Renko studied diffusion of tracer molecules to study paracellular diffusion across an epithelial monolayer of Caco-2 cells. The tracers were fluorescently labelled dextran molecules of different molecular weight. She is screening various drugs to determine whether they affect the cells in any way. Which drugs are most likely to change paracellular diffusion? a.) Drugs that modify microvilli are the most likely to change paracellular diffusion b.) Drugs that modify gap junctions are the most likely to change paracellular diffusion c.) Drugs that modify with aquaporins are the most likely to change paracellular diffusion d.) Drugs that modify tight junctions are the most likely to change paracellular diffusion
Active transport must function continuously because_______. a. plasma membranes wear out b. cells must be in constant motion c. facilitated transport opposes active transport d. diffusion is constantly moving the solutes in the other direction
Focal adhesion complex attachment to extracellular matrix molecules is mediated by: heterodimers of alpha-integrin and beta integrin homodimers of classical cafherins The force of gravity actin filaments
Intercalated discs, oblique complexes, opposite orientation , staggered 60- cell from one side. They are also connected to extracellalise mani proteins. They constitute a connection between are transmembrane proteins connected to actin fluments and cytoskeleton in the interior of the the cell interior and exterior. A. Integrins B. Intermediate filaments C. Gap junctions D. Cadherin junction Part II: Fill in the blank: IL-04,5,6 1- The addition of more subunits at either end of MTs is called......... 2- function as antennae for cells to probe their environment...... 3- It is from the kinesin family of proteins, binds the growing ends and induce catastrophe.... 4- An intracellular non-protein molecule that participates in cell signaling...... 5- Each tubulin heterodimer binds ------- GTP molecules br 6-responsible for the formation of stress fibers.....dougo 7- an important component of structures that grow from skin in animals...... Xom alex 8- proteins are fibrous rather than…
The following figure shows the process of: High glucose concentration (Glucose)ut = (Glucose], O Active transport Phagocytosis O Simple diffusion None of these is correct Facilitated diffusion
Match the cellular junction with its characteristic (side of cell, cellular role, intracellular connection or transmembrane protein) tight junctions focal adhesions desomsomes gap junctions A. link the intermediate filaments of neighboring cells using homophilic cadherin-cadherin binding B. integrins link the actin-myosin stress fibers to the extracellular matrix C. occludins bind to occludins and prohibit the diffusion of membrane proteins from the baso-lateral surface to the apical surface of epithelial cells D. connexons form pores between cells in an epithelial sheet or tube
5. Which of the following is NOT true about channel and carrier proteins? a) Carriers never form a direct opening between inside and outside the cell. b) Channels generally transport material faster than carriers. c) Only carriers are used for selective transport of materials d) All of the above are true about channel and carrier proteins. 6. If it can cross a membrane, a solute will move from a hyposmotic/hyperosmotic (circle or highlight the correct one) solution to a hyposmotic/hyperosmotic (circle or highlight the correct one) solution. 7. Water always moves from a hyposmotic/hyperosmotic (circle or highlight the correct one) solution to a hyposmotic/hyperosmotic (circle or highlight the correct one) solution.
All are protiens of cell membrane that are involved in flow of nerve impulse except 1-channel proteins 2-carrier protiens 3-peripheral protiens 4-integral protiens Also give explanation
What sort of cellular changes would you expect a sailor sick with scurvy to experience? O Their collagen (an extracellular matrix component) would be diminished, resulting in fewer binding sites for integrins. The end result would be less adherent cells. O Their collagen (a cytoskeletal fiber) would be diminished, resulting in a loss of contractile motion within the cell, affecting both cell migration and muscle function.
You're studying secretion of antibodies by B-cells. B-cells are immune cells that make antibodies (antibodies are proteins) and secrete them outside of the cell (in other words, the protein is made in the cell, and is 'spit' out). Given the B-cell's role as antibody secreter what organelles do you expect to see in large amounts/volume within the cell? What type of transport is antibody secretion? Does the secretion of antibody require energy (ie., is this type of transport "active")?
As we age our skin becomes thin and easily tears. One potential reason to explain would be if adjacent cells within the skin lose the ability to attach to each other strongly. Another reason could be that cells lose the ability to attach strongly to the extracellular matrix. Compare and contrast these membrane functions and suggest which proteins might be “lost” as we age to cause the loss of attachment function in each scenario