Campbell Biology: Concepts & Connections (8th Edition)
8th Edition
ISBN: 9780321885326
Author: Jane B. Reece, Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan
Publisher: PEARSON
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Chapter 8, Problem 20TYK
Summary Introduction
To determine: The number of cell divisions in bone marrow per second to replace red blood cells.
Introduction:
Erythropoiesis is the process of formation and maturation of all blood cells. Erythrocytes or red blood cells are continuously produced in the bone marrow. These cells stay in blood circulation for about 120 days.
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A normal red blood cell is small and shaped like a flattened disk. The interior of a red blood cell has a salt
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In 1925, E. Gorter and F. Grendel used an apparatus like that described in Problem 1 to determine the surface area of a lipid monolayer formed bylipids extracted from erythrocytes of several animal species. They used a microscope to measure the dimensions of individual cells, from which they calculated the average surface area of one erythrocyte. They obtained the data shown in the table below. Were these investigators justified in concluding that “chromocytes [erythrocytes] are covered by a layer of fatty substances that is two molecules thick” (i.e., a lipid bilayer)?
Chapter 8 Solutions
Campbell Biology: Concepts & Connections (8th Edition)
Ch. 8 - Complete the following table to compare mitosis...Ch. 8 - If an intestinal cell in a grasshopper contains 24...Ch. 8 - Which of the following is not a function of...Ch. 8 - It is difficult to observe individual chromosomes...Ch. 8 - A fruit fly somatic cell contains 8 chromosomes....Ch. 8 - If a fragment of a chromosome breaks off and then...Ch. 8 - Which of the following phases of mitosis is...Ch. 8 - A biochemist measured the amount of DNA in cells...Ch. 8 - A micrograph of a dividing cell from a mouse...Ch. 8 - Cytochalasin B is a chemical that disrupts...
Ch. 8 - Why are individuals with an extra chromosome 21,...Ch. 8 - In the light micrograph below of dividing cells...Ch. 8 - An organism called a plasmodial slime mold is one...Ch. 8 - Prob. 14TYKCh. 8 - Discuss the factors that control the division of...Ch. 8 - Compare cytokinesis in plant and animal cells. In...Ch. 8 - Sketch a cell with three pairs of chromosomes...Ch. 8 - Suppose you read in the newspaper that a genetic...Ch. 8 - Bacteria are able to divide on a faster schedule...Ch. 8 - Prob. 20TYKCh. 8 - A mule is the offspring of a horse and a donkey. A...Ch. 8 - Prob. 22TYK
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- If you place a sample of your blood (which is primarily red blood cells) in a beaker of distilled water, what do you think would happen to the RBCs? Why? Is water moving into or out of the cells? Is the water hypotonic, isotonic, or hypertonic compared to the intracellular fluid in the RBCs? Knowing that normal cellular osmolarity is 300 mOsmol, what do you think would happen if you mixed your RBCs with a 1.8% NaCl solution? Why? What is the osmolarity of the 1.5% NaCl solution? RBCs with distilled water and why Is water moving into or out of the RBCs in this solution? Is the water hypo-, iso- or hypertonic? RBCs with 1.8% NaCl solution and why Osmolarity (osmol/L) of the 1.8% NaClarrow_forwardTransport of biomolecules to tissues takes place through capillary walls by both convection and diffusion. Consider an endothelium in which the gaps between the cells are characterized by the following dimensions: L=1 µm long, h=200 nm high, and W=10 nm in width (the last dimension is the distance between the two cells). The fluid is at 37degC and has the same properties as physiologic saline. Let the average pressure in the capillary be 45 mm Hg and let the pressure in the tissue be 0 mm Hg (ignore osmotic effects). Consider a small solute that has a diffusion coefficient of 1x10-5 cm2/s. Does this solute pass across the endothelium by diffusion or is it primarily carried by flow?arrow_forwardDescribe the reason why the red blood cells placed in one solution swell and burst and also why the red blood cells placed in another solution shrink and wrinkle.arrow_forward
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