EBK BIOLOGY
5th Edition
ISBN: 9780133954425
Author: Maier
Publisher: YUZU
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Chapter 3, Problem 2LTB
Summary Introduction
To describe:
Three common substances, which can easily pass through the cell membrane.
Introduction:
The cell membrane is the outer layer boundary of every cells. It is made up of phospholipids and is semipermeable to the substances. It acts as a barrier between the internal and the external environment of the cell.
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- Discuss the five ways substances can pass across the cell membrane. Give examples of eacharrow_forwardDistinguish between active and passive mechanisms of movement across cell membranes.arrow_forwardWhich observation would suggest that active transport, rather than diffusion, is responsible for moving a particular substance from the outside of a cell into a cell?arrow_forward
- Compare and contrast the four basically different ways that a substance can move across the plasma membrane. Present it in a matrix.arrow_forwardDraw and label a cell lipid bilayer and diagram how the following transport processes take place: passive diffusion of oxygen into the cell, facilitated diffusion of potassium into the cell, active transport of sucrose into the cell. Using different symbols (circles for oxygen, squares for sucrose, and triangles for potassium ions), show the relative concentrations (gradients) of these substances on the inside and outside of the cell. For example, to show that oxygen enters the cell by going “down” its gradient, you would draw more circles on the outside of the cell than inside the cell. Be sure to show and label membrane proteins when appropriate, and show the electric membrane potential using “+”s (pluses) on one side and “-”s (minuses) on the other side of the membrane. Also show the proton pump which uses ATP as a source of energy.arrow_forwardAll of the following are passive membrane transport processes except: (a) diffusion. (b) facilitated diffusion. (c) vesicular transport. (d) osmosis.arrow_forward
- Factors that affect the rate of diffusion through a membrane include all of the following EXCEPT: a)membrane surface area. b) molecular weight. c) availability of energy. d) steepness of concentration gradient.arrow_forwardIn the plasma membrane, proteins carry out the following tasnks except ONE: 1. ALL other are carried out by proteins 2. catabolic reaction (digestion of complex molecules into simpler one) 3. gather information from surroundings/neighboring cells 4. shuttles molecules across the membrane 4. Binding to other cells via cytoskelletonarrow_forwardDescribe the permeability of cell membranes. How to substances cross cell membranes? Utilize the terms bi-polar, semi-permeable, diffusion, active transport, membrane proteins, endocytosis, exocytosis, vesicles, phagocytosis, pinocytosis, etc. (This should be 3-4 paragraphs long)arrow_forward
- . what are two structural characteristics of cell membrane determine whether substances can pass through them passively? What determines whether or not a substance can be actively transported through the membrane?arrow_forwardDiffusion does not require the cell to spend ATP and relies on a concentration gradient. Therefore, diffusion is considered a type of: O passive transport active transport O endocytosis O phagocytosis O No answer text provided.arrow_forwardDescribe the basic constituent of the cell membranearrow_forward
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