Biology
11th Edition
ISBN: 9781259188138
Author: Peter H Raven, George B Johnson Professor, Kenneth A. Mason Dr. Ph.D., Jonathan Losos Dr., Susan Singer
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 4, Problem 7U
Plasmodesmata in plants and gap junctions in animals are functionally similar in that
a. each is used to anchor layers of cells.
b. they form channels between cells that allow diffusion of small molecules.
c. they form tight junctions between cells.
d. they are anchored to the extracellular matrix.
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The gap junctions of animal cells differ from the plasmodesmata ofplant cells in thata. gap junctions serve as communicating junctions and plasmodesmataserve as anchoring junctions.b. gap junctions prevent extracellular material from moving betweenadjacent cells but plasmodesmata do not.c. gap junctions allow for direct exchange of cellular material betweencells but plasmodesmata cannot allow the same type of exchange.d. gap junctions are formed by specialized proteins that form channelsthrough the membranes of adjacent cells but plasmodesmata areformed by connecting the plasma membranes of adjacent cells.e. All of the above are correct.
Which of the following statements about plasmodesmata is true? a. They prevent cytoplasm from passing between cells. b. They are important in the formation of tight junctions. c. They may float freely in the cytoplasm or be membrane-bound. d. They allow adjacent plant cells to communicate with each other.
what is the protein component of the contractile ring that divides the cytoplasm of animal cells during cytokinesis
a. tubulin
b. actin
c. microtubulin
d. lamin
e. chitin
Chapter 4 Solutions
Biology
Ch. 4 - Which of the following statements is NOT part of...Ch. 4 - All cells have all of the following except a....Ch. 4 - Eukaryotic cells are more complex than prokaryotic...Ch. 4 - Which of the following are differences between...Ch. 4 - The cytoskeleton includes a. microtubules made of...Ch. 4 - The smooth endoplasmic reticulum is a. involved in...Ch. 4 - Plasmodesmata in plants and gap junctions in...Ch. 4 - The most important factor that limits the size of...Ch. 4 - All eukaryotic cells possess each of the following...Ch. 4 - Adherens junctions, which contain cadherin, are...
Ch. 4 - Different motor proteins like kinesin and myosin...Ch. 4 - The protein sorting pathway involves the following...Ch. 4 - Chloroplasts and mitochondria have many common...Ch. 4 - Prob. 7ACh. 4 - The smooth endoplasmic reticulum is the site of...Ch. 4 - Use the information provided in table 4.3 to...Ch. 4 - Prob. 3SCh. 4 - The protist Giardia intestinalis is the organism...
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- 9) Gap junctions are intercellular connections that A. primarily serve to keep cells separated and allow for transport across a tissue barrier. B. serve as a regulated cytoplasmic bridge for sharing of small molecules between the cells. C. serve as a barrier to prevent protein movement within the cellular membrane. D. are cellular components for constitutive exocytosis that occurs between adjacent cells.arrow_forwardWhich of the following is NOT a function of lysosomes? a. digesting particles taken in by endocytosis b. help in the formation of cell membranes c. degrading worn-out or nonfunctional organelles d. breaking down bone to release calcium ions into the bloodarrow_forwardWhich of the following statements describes the function of plasma membranes? I. define the boundaries of the cell and its organelles and act as permeability barriers II. sites for specific biological and chemical functions III. possess transport proteins that regulate the movement of substances into and out of the cell and its organelles IV. contain protein molecules that act as receptors to detect external signals V. provide mechanisms for cell-to-cell contact, adhesion, and communication A. I and III B. I, III, IV C. I, III, IV, V D. I, II, III, IV, Varrow_forward
- Which of the following is a feature common to all three components of the cytoskeleton? a. They all serve to scaffold the organelles within the cell. b. They are all characterized by roughly the same diameter. c. They are all polymers of protein subunits. d. They all help the cell resist compression and tension.arrow_forwardDiseased animal cells may produce molecules thatactivate death cascades to kill the cells in a controlledmanner. Why would neighboring healthy cells also die?a. The death molecule is passed throughdesmosomes.b. The death molecule is passed throughplasmodesmata.c. The death molecule disrupts the extracellularmatrix.d. The death molecule passes through gap junctions.arrow_forwardWhich of the following is NOT a function of membrane-embedded proteins?Choose one:A. Membrane-embedded proteins can form the base of structures that extend out of the cell (such as flagella and pili).B. Membrane-embedded proteins can store important inheritable information that is needed by the cell.C. Membrane-embedded proteins can serve as receptors that detect specific environmental conditions.D. Membrane-embedded proteins can import or export specific molecules through the membrane.arrow_forward
- certain cells in the pancreas of animals produce and secrete insulin. Which of the following organelles would be found in abundance in these cells? a.) centrioles and spindle fibers b.) lysosomes and peroxisomes c.) rough ER and golgi apperatusarrow_forwardWhich of the following junctions allows for cytoplasm-to-cytoplasmcommunication between cells?a. adhesion junctions c. gap junctionsb. tight junctions d. None of these are correct.arrow_forwardIndicate whether the following statements are true or false. If a statement is false, explain why it is false. a. All types of cells contain cell walls, but only some cell types possess plasma membranes. b. The distribution of specific lipids to the inner and outer leaflet is asymmetrical, or biased, in plasma membranes. C. Lateral diffusion is the movement of lipids from one layer of the membrane to the other. d. Fatty acids tails are used to embed integral, transmembrane proteins in the plasma membrane.arrow_forward
- 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 (methanearrow_forwardThe smooth endoplasmic reticulum is a. involved in protein synthesis. b. a site of protein glycosylation. c. used to store a variety of ions. d. the site of lipid and membrane synthesis.arrow_forwardAnimal cells adhere together strongly through ., which are supported by intermediate filaments a. cellulose fibers b. desmosomes O c. plasmodesmata O d. tight junctions e. gap junctionsarrow_forward
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