EP CAMPBELL BIO.FOCUS-MOD.MASTER.(18WK)
3rd Edition
ISBN: 9780136781851
Author: Urry
Publisher: PEARSON CO
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Chapter 4, Problem 10TYU
Summary Introduction
To discuss:
How the small intestinal epithelial cell structures that are viewed in SEM contribute to their specialized functions of nutrient absorption, and to explain how they act as a barrier between intestinal contents and the blood supply on the other side of the cell sheet.
Introduction:
Several layers such as the serous coat, the muscular coat, the outer longitudinal and inner circular linings, and the sub mucous coat are present in the small intestine.
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Tight junctions are protein junctions that provide a water-tight seal between cells. They ensure that materials must enter the cells (through diffusion or active transport) to pass through the tissue. Tight junctions are characteristic of cells lining the digestive tract, where materials are required to pass through cells (not between them) before they can travel into the blood.
Can someone explain more clearly why lining the digestive tract?
Cell membrane modifications found on epithelial cells in the small intestine and kidney tubules that prevent movement of material from the intestinal tract into the peritoneal cavity are called ______
Explain why the statement is correct.
Which is true of the ribosomes of endoderm cells of the Cnidaria (jellyfish)?
They: are attached to the Rough Endoplasmic reticulum (RER) and carry out the synthesis of the primary structure of proteins
Chapter 4 Solutions
EP CAMPBELL BIO.FOCUS-MOD.MASTER.(18WK)
Ch. 4.1 - Prob. 1CCCh. 4.1 - Prob. 2CCCh. 4.2 - Briefly describe the structure and function of the...Ch. 4.2 - Prob. 2CCCh. 4.3 - What role do ribosomes play in carrying out...Ch. 4.3 - Describe the molecular composition of nucleoli,...Ch. 4.3 - WHAT IF? As a cell begins the process of dividing,...Ch. 4.4 - Describe the structural and functional...Ch. 4.4 - Describe how transport vesicles integrate the...Ch. 4.4 - WHAT IF? Imagine a protein that functions in the...
Ch. 4.5 - Describe two characteristics shared by...Ch. 4.5 - Prob. 2CCCh. 4.5 - Prob. 3CCCh. 4.6 - Prob. 1CCCh. 4.6 - WHAT IF? Males afflicted with Kartageners syndrome...Ch. 4.7 - In what way are the cells of plants and animals...Ch. 4.7 - Prob. 2CCCh. 4.7 - MAKE CONNECTIONS The polypeptide chain that makes...Ch. 4.8 - Colpidium colpoda is a unicellular protist that...Ch. 4 - Which structure is not part of the endomembrane...Ch. 4 - Which structure is common to plant and animal...Ch. 4 - Which of the following is present in a prokaryotic...Ch. 4 - Cyanide binds to at least one molecule involved in...Ch. 4 - Which cell would be best for studying lysosomes?...Ch. 4 - DRAW IT From memory, draw two eukaryotic cells....Ch. 4 - SCIENTIFIC INQUIRY In studying micrographs of an...Ch. 4 - FOCUS ON EVOLUTION Compare different aspects of...Ch. 4 - FOCUS ON ORGANIZATION Considering some of the...Ch. 4 - Prob. 10TYU
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- Proteins that are trafficked through the secretory pathway of eukaryotic cells are never exposed directly to the cytoplasm. Which of the following is the best explanation for why this is true? A. Cells that specialize in protein secretion lack cytoplasm, because protein synthesis machinery takes up the volume of the cell instead. B. For a protein that will be secreted, during the whole time that it spends inside of the cell, it is enclosed within other membrane-bound compartments. C. While a protein is in the secretory pathway, it is surrounded by a dense cloud of ions that protect it from the cytoplasm. D. A protein that will be secreted is not synthesized by ribosomes in the cytoplasm; instead, it is synthesized by proteins at the plasma membrane and fed directly into the extracellular space.arrow_forwardFibroblasts are motile cells that “creep” about in the connective tissue of the body where they play a number of roles, including secretion of the extracellular matrix and initiating certain wound healing events. These cells do not usually have microvilli nor do they express the actin-binding protein villin; both of these properties are characteristic of certain epithelial cells, such as those lining the intestine and kidneys. Remarkably enough, however, if one artificially engineers fibroblast cells to produce the villin protein, microvilli form on the fibroblasts. Given what you know about the function of villin, why might this striking change in cell morphology occur?arrow_forwardWhich statements correctly describe the rough endoplasmic reticulum (rough ER)? It has ribosomes bound to its membrane. It synthesizes proteins that will be sent out of the cell. It stores and releases calcium ions. It is connected to the membrane of the nucleus. It is used to transport mRNA to the cell membrane.arrow_forward
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