a. Simple Diffusion b. Facilitated diffusion by a channel protein c. Facilitated diffusion by a carrier/transport protein d. Active transport by a pump e. Could be B or C, not enough information is given • Chloride (Cl-) is an ion that is essential for neuronal signaling and regulating action potential/excitability in neurons. When chloride receptors are opened with a neurotransmitter, Cl- flows from high concentration in the synapse (outside of the cell) to low concentration in the neuron cell. ● ● Oxygen gas must cross from the bloodstream into cells and it has the chemical structure O=O. Glucose is a polar molecule that moves from the small intestine, where it is found in high concentration, to inside the cells that line the digestive tract, where it is found in low concentration. Glucose moves into the cell with the help of a protein that changes shape.

a. Simple Diffusion b. Facilitated diffusion by a channel protein c. Facilitated diffusion by a carrier/transport protein d. Active transport by a pump e. Could be B or C, not enough information is given • Chloride (Cl-) is an ion that is essential for neuronal signaling and regulating action potential/excitability in neurons. When chloride receptors are opened with a neurotransmitter, Cl- flows from high concentration in the synapse (outside of the cell) to low concentration in the neuron cell. ● ● Oxygen gas must cross from the bloodstream into cells and it has the chemical structure O=O. Glucose is a polar molecule that moves from the small intestine, where it is found in high concentration, to inside the cells that line the digestive tract, where it is found in low concentration. Glucose moves into the cell with the help of a protein that changes shape.

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter5: Structure And Function Of Plasma Membranes

Section: Chapter Questions

Problem 7RQ: A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with...

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Similar questions

The freeze-fracture technique demonstrated: a. that the plasma membrane is a bilayer with individual proteins suspended in it. b. that the plasma membrane is fluid. c. that the arrangement of membrane lipids and proteins is symmetric. d. that proteins are bound to the cytoplasmic side but not embedded in the lipid bilayer. e. the direction of movement of solutes through the membrane.
A scientist compares the plasma membrane composition of an animal from the Mediterranean coast with one from the Mojave Desert. Which hypothesis is most likely to be correct? The cells from the Mediterranean coast animal will have more fluid plasma membranes The cells from the Mojave Desert animal will have a higher cholesterol concentration in the plasma membranes The cells’ plasma membranes will be indistinguishable The cells from the Mediterranean coast animal will have a higher glycoprotein content, while the cells from the Mojave Desert animal will have a higher lipoprotein content.
Which of the following statements is false? Proteins in the plasma membrane can: a. transport ions. b. transport chloride ions when there are two mutant copies of the cystic fibrosis transmembrane conductance regulator gene. c. recognize self versus foreign molecules. d. allow adhesion between the same tissue cells or cells of different tissues. e. combine with lipids or sugars to form complex macromolecules.
A characteristic of carrier molecules in a primary active transport pump is that: a. they cannot transport a substance and also hydrolyze ATP. b. they retain their same shape as they perform different roles. c. their primary role is to move negatively charged ions across membrances. d. they move Na+ into a neural cell and K+ out of the same cell. e. they act to establish an electrochemical gradient.
The principal force driving movement in diffusion is the. temperature particle size concentration gradient membrane surface area
1.There are different processes for transport of molecules of ions across cell membranes. Explain briefly each process a. Simples diffusion b. Facilitated diffusion via carrier proteins c. Facilitated diffusion via ion channels d. Primary active transport e. Secondary active transport f. Endocvtosis g. Exocytosis h. Transcytosis 2. List four Physical factors that affect the rate of diffusion and how they will affect it. 3. What kind of molecules can pass through the plasma membrane of the cells through simple diffusion? Give brief discussion. 4. List the three main parts of a cell and explain their functions. 5. Define an organelle. Which organelles are surrounded by a membrane and which are not? 6. What is the key difference between passive and active process? 7. Why RNA transcription can still serve the needs of the cell even if its operation is slow compared to DNA?
5. All of the following membrane activities require ATP energy except? a. facilitated diffusion b. active transport c. sodium ions moving out of the cell d. protons pumps e. translocation of potassium into a cell
7. Which of the following membrane transport proteins would you expect to be the most selective (although not the most rapid)? the bicarbonate ion channel the glucose carrier protein the potassium ion channel the chloride ion channel the sodium ion channel
1. Define Osmosis. 2. Describe in detail, the similarities between osmosis and diffusion. Make sure you make a statement about each process. 3.As the solute concentration rises from 0% up to 100% of solute, what happens to the solvent concentration?
3. The protein integrin binds to actin filaments and, by binding to proteins like fibronectins, connects to collagen. In this manner, integrin ______. A.controls the permeability of the cytoplasmic membrane B. suspends organelles within the cytoplasm C. provides a direct linkage between the cytoskeleton and the extracellular matrix D. helps keep individual cells in place and connects adjacent cells to each other
4. The cells making up the epithelial linings of organs that contain liquid, e.g., the bladder and intestines, could be expected to be held together via many ______ in order to provide a waterproof lining. A. tight junctions B. gap junctions C. phospholipids D. intermediate filaments
1. Imagine a hypothetical situation in which an animal cell such as a hepatocyte or a macrophage would completely lose the ability to produce membrane proteins. a) What would be the structural and molecular organization of such a hypothetical cell? b) How do you think this situation would affect the function of that cell? Be as thorough as you can.