Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Chapter 4, Problem 12SQ
Summary Introduction
Introduction: Cell junctions are multiprotein structures that link cells to each other and to the environment. They help in cell–cell communication and signal transduction in multicellular organisms such as animals and plants. They can be classified as intercellular and extracellular.
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Suppose you are to describe structure 3, which of the following best describes
it?
Figure 4. Cell Modification
(Source: https://www.slideshare.net/lesson-4-cell-madifications
A. It is known as communicating junctions that sends signal to other cells.
B. It allows direct exchange of chemicals between the cytoplasm of two cells.
C. It acts as barriers that regulate the movement of water and solutes
between epithelial layers.
D. It is an anchoring junction on the lateral surface of the cell which fastens
cells to another basement membrane.
2.
3.
Match the description with the appropriate cell junction type. Answers can be used more than once.
|- v connects cells to cells & cells to their cytoskeleton
A. gap junction & plasmodesmata
vjunctions that would allow for fast movement of ions between cells
B. desmosomes & adherins
|- v limits mobility of molecules in the extracellular space
C. tight junctions
|- v allows for direct cytoplasmic connections between cells
Actin is found in _______. Microtubules are found in ________
Select one:
a.
mitotic spindles and microvilli, flagella and cilia
b.
microvilli and flagella, lamellipodium and cilia
c.
microvilli and lamellipodium, flagella and cilia
d.
flagella and lamellipodium, flagella and desmosomes
e.
flagella and cilia, microvilli and lamellipodium
Clear my choice
Chapter 4 Solutions
Biology: The Unity and Diversity of Life
Ch. 4 - Effects of Kartagener Syndrome An abnormal form of...Ch. 4 - All cells have these three things in common:...Ch. 4 - Which of the following is,not a principle of the...Ch. 4 - The surface-to-volume ratio _______. a. does not...Ch. 4 - A plasma membrane ________. a. controls exchanges...Ch. 4 - True or false? Ribosomes are only found in...Ch. 4 - Unlike eukaryotic cells, prokaryotic cells ______....Ch. 4 - What controls the passage of molecules into and...Ch. 4 - The main function of the endomembrane system is:...Ch. 4 - Enzymes. contalned in _______ break down worn-out...
Ch. 4 - Put the following structures in order according to...Ch. 4 - Which of the following statements is false? a. The...Ch. 4 - Prob. 12SQCh. 4 - Which of the following organelles contains no DNA?...Ch. 4 - No animal cell has a ___________. a. plasma...Ch. 4 - Prob. 15SQCh. 4 - Expalin the difference between cytosol and...Ch. 4 - In a classic episode of Star Trek, a gigantic...Ch. 4 - Prob. 3CTCh. 4 - What type or micrograph is shown below? Is the...
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- FtsZ proteins direct the formation of a _______ that will eventually form the new cell walls of the daughter cells. a. contractile ring b. cell plate c. cytoskeleton d. septumarrow_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_forwardWhich of these cell junctions are open channels that connect the cytoplasm of adjoining plant cells? A. Adhering junctions B. Tight junctions C. Gap junctions D. Plasmodesmataarrow_forward
- Focal adhesions ________. a. have been implicated in cell locomotion b. contain integrins that develop transient interactions with the extracellular matrix c. collect information about the chemical properties of the extracellular environment d. transmit information to the cell interior that may lead to changes in cell adhesion, proliferation or survival e. All of these are correct.arrow_forwardWhich of the following is not a function of proteins present in theplasma membrane?a. Proteins assist the passage of materials into the cell.b. Proteins interact with and recognize other cells.c. Proteins bind with specific hormones.d. Proteins carry out specific metabolic reactions.e. Proteins produce lipid molecules.arrow_forwardThe plasma membrane of a cell is composed of a ________ ________ and regulates molecular passage via _______ ________. a. potassium bilayer, unidirectional diffusion b. phospholipid bilayer, selective permeability c. phospholipid bilayer, random permeability d. protein wall, osmotic pumpsarrow_forward
- Which of the following cell organelles contains RNA? a. Mitochondria b. Plastids c. Lysosomes d. Ribosomesarrow_forwardWhat do you call a finger-like projection that arises from epithelial layer in some organs that helps to increase surface area allowing for faster and more efficient adsorption? A. cillia B. flagella C. microvilli D. villi Cell modification is the change in the structure of cell to carry out specialized function. Which of the following words will BEST describe the cell modification? A. alteration B. differentiation C. evolution D. mutation You learned that cells are structurally modified so that they can perform their function efficiently and effectively. Which of the following structures have specialized functions due to cell modification? I. Guard cells II. Haemoglobin Trichomes Xylem vessels III. IV. A. 1, II and III B. I, II and Iv C. I, III, and IV D. I, II, III and IV Which of the following statements best illustrate the adaptation and function of nodified cell? A. The xylem in the leaf helps the leaf to be positioned horizontally towards the sun. B. The hair-like structure in…arrow_forwardThe main function of plasma membranes is to ________. a. physically protect the cell b. separate the internal environment of the cell from the environment c. ensure the cell properly communicates with stimuliarrow_forward
- Actin is found in Microtubules are found in Select one: a. microvilli and flagella, lamellipodium and cilia Ob. flagella and lamellipodium, flagella and desmosomes c. mitotic spindles and microvilli, flagella and cilia d. microvilli and lamellipodium, flagella and cilia e. flagella and cilia, microvilli and lamellípodium ycle HW due Jump to. O Next page cancer stem cellsarrow_forwardThe tigroid lysis is observed in a case of functional exhaustion of the neuron. It is resulted in decay of basophilic substance and brightening of the neuroplasma. What organelles changes do this phenomenon is associated with? a. Granular endoplasmic reticulum O b. Lysosomes O c. Neurofibrils d. Golgi apparatus O e. Mitochondriaarrow_forwardA plasma membrane_____ . a. controls exchanges between the cell and the external environment b. is a mesh of intermediate filaments c. is a type of extracellular matrixarrow_forward
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