What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 4, Problem 6MC
Summary Introduction
Introduction:
The cytoskeleton is an internal scaffolding seen in cells.
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The extracellular matrixa. assists in the movement of substances across the plasmamembrane.b. prevents the loss of water when cells are placed in a hypertonicsolution.c. has numerous functions that affect the shape and activities of thecell that produced it.d. contains the junctions that sometimes occur between cells.e. All of these are correct.
Identify the non-polar organic molecule which can pass freely through the plasma membrane.A. CH3CH2OH (ethanol)B. CO2 (carbon dioxide)C. C6H12O6 (glucose)D. N2 (nitrogen gas)E. CH4 (methane
Which of the following describes integral membraneproteins?a. They permit water movement only into or out of thecell.b. They transport only large proteins into the cell.c. They extend across the phospholipid bilayer.d. They are attached to the external plasma membranesurface
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What Is Life? A Guide to Biology with Physiology
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- The cytoskeleton of a cell consists of all of the following, excepta. microtubules.b. actin fi laments.c. extracellular matrix.d. intermediate fi laments.arrow_forwardCilia and fl agella are involved ina. forming junctions between cells.b. establishing the extracellular matrix.c. cell-to-cell communication.d. cell movement.arrow_forwardWhich statement about the plasma membrane is INCORRECT Select one : a It is composed of two layers of glycoprotein molecules . b. The plasma membranes of adjacent cells may be held together by desmosomes . . It contains receptors for specific molecules d . Gap junctions may be present between adjacent cells eltis selectively permeablearrow_forward
- Calcium ions (Ca?+) are a typical cell at rest. a. more concentrated in the cytosol of b. equally distributed across the membrane of c. more concentrated in the extracellular fluid ofarrow_forwardPeripheral proteins are membrane proteins that... a. attach to integral proteins b. insert into the plasma membranec. include glycoproteins on intracellular surfaced. all of the abovee. none of the abovearrow_forwardWhich of the following is not a function of the extracellular matrix Select one: A. Prevents the loss of water when cells are placed in a hypertonic solution. B. Assists in the movement of substances across the plasma membrane. C. Has numerous functions that affect the shape and activities of the cell that produced it. D. Takes place in reception of moleculesarrow_forward
- Which of the statement about cell membrane is not true? * It contains protein molecules embedded in the lipid bilayer B. It is a differentially permeable membrane. C. It contains charged pores thus ions being O charged particles cross cell membrane much easier than neutral particles. D. It may get infolded to engulf solid or liquid material.arrow_forwardThe difference between a gap junction and plasmodesmata is… Select one: a. Gap junctions are formed by microfilaments while plasmodesmata are formed by membrane b. Gap junctions are anchoring junctions while plasmodesmata are protein junctions. c. Gap junctions are formed by proteins making pores between two animal cells while plasmodesmata are formed due to incomplete cell division of membranes from adjoining plant cells.arrow_forwardMicrofilaments participate in the formation of _________ and are made of ________: a. cilia, tubulin b. flagella, tubulin c. cell cleavage furrows, actin d. basal bodies, actin e. mitotic spindles, actin ...explain your answer.arrow_forward
- Mark the following statements about the cytoskeleton as true or false. If a statement is false, correct it to make a true statement.a. _____ Actin filaments combine with myosin motor proteins to provide the cell with mechanical strength.b. _____ The cilia found on sperm cells propel the cells through a liquid medium.c. _____ Microtubules are hollow tubes that align organelles and shuttle them to their proper places in the cell.d. _____ Intermediate filaments are ropelike structures composed of tubulin proteins.e. _____ Centrioles are part of the centrosome from which microtubules originate.f. _____ Endocytosis, exocytosis, muscle cell contraction, and cellular “crawling” are all mediated by intermediate filamentsarrow_forwardIn the image, the tight junction proteins link cells together creating a barrier. These barrier proteins... protein A apical plana embrane (A) tight ntion lateral plauma brane banal plama membrane bal lamina Oa Puli the cells so close together ions struggle to fit between cells. O b. ) Prevent Transmembrane proteins from using membrane dynamics to float from the apical to the basolateral locations of a cell. OC. Are cytoplasmic-side anchoring proteins O d. Prevent proteins and lipids trom moving from apical to basolateral and don't let things pass between 2 cells side by side.arrow_forwardIn cell membrane, the regulation of membrane rigidity is the function of _____. While proteins ______ A. Carbohydrates; Cell recognition B. Cholesterol; Move nutrients and electrolytes across C. Lipid; Impart polarity to the interior membrane D. Fatty acids; Prevent tight packing of fatty acid chains E.Cholesterol; Act as receptors for neurotransmitter and hormone bindingarrow_forward
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