4948: Which of the following statements best describes how substances are transported across a membrane against their concentration gradient?Some membrane proteins act as channels for specific molecules to enter the cell. The plasma membrane is permeable to all small molecules. Some membrane proteins are ATP-dependent carrier molecules. The plasma membrane is fully hydrophobic. Even though humans are approximately 99.9 % identical in their genetic makeup, an incredible amount of variation is seen among individuals of the species. This genetic variation is greatly influenced by the process of meiosis.Based on the following events that occur during meiosis, which contributes most to genetic diversity in the human population? Condensation of chromatin during meiosis I Recombination between homologous chromatids during meiosis I Alignment of sister chromatids at the metaphase plate during meiosis II Separation of sister chromatids during meiosis II

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4948: Which of the following statements best describes how substances are transported across a membrane against their concentration gradient? Some membrane proteins act as channels for specific molecules to enter the cell. The plasma membrane is permeable to all small molecules. Some membrane proteins are ATP-dependent carrier molecules. The plasma membrane is fully hydrophobic.

4948: Which of the following statements best describes how substances are transported across a membrane against their concentration gradient? Some membrane proteins act as channels for specific molecules to enter the cell. The plasma membrane is permeable to all small molecules. Some membrane proteins are ATP-dependent carrier molecules. The plasma membrane is fully hydrophobic.

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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Eukaryotic membrane fluidity can be increased by which of the following mechanisms? increasing the number of carbons in the fatty acids of membrane lipids increasing the number of fatty acids attached to glycerol in membrane lipids increasing the number of straight-chain fatty acids of membrane lipids increasing the degree of unsaturation in the fatty acids of membrane lipids increasing the number of membraned organelles in the eukaryotic cell
35: Which of the following statements makes it necessary for animal cells, although they have no cell walls, to have intercellular junctions? Cell-to-cell communication requires physical attachment of one cell to another. Maintenance of connective tissue shape requires cells to adhere to one another. Cell membranes do not distinguish the types of ions and molecules passing through them. Large molecules, especially proteins, do not readily get through one, much less two adjacent cell membranes. 21: Living things are made up of cells. Cells are organized at different levels to form very complex living organisms like your body. Each level has a specific role or job to perform. Which of the following correctly describes the order of organization from the simplest to the most complex? tissues, cells, organs, organisms, organ systems cells, tissues, organs, organ systems, organisms organs, organ systems, organisms, cells, tissues organisms,…
Eukaryotic membrane fluidity can be increased by which of the following mechanisms? cell bio increasing the number of carbons in the fatty acids of membrane lipids increasing the number of fatty acids attached to glycerol in membrane lipids increasing the number of straight-chain fatty acids of membrane lipids increasing the degree of unsaturation in the fatty acids of membrane lipids increasing the number of membraned organelles in the eukaryotic cell
34: Which of the following best describes how high levels of cholesterol affect the cell membrane at certain temperatures? At high temperatures, high amounts of cholesterol decrease the rigidity of the cell membrane. At low temperatures, high amounts of cholesterol increase the rigidity of the cell membrane. At low temperatures, high amounts of cholesterol increase the fluidity of the cell membrane. At high temperatures, high amounts of cholesterol increase the fluidity of the cell membrane.
Eukaryotic membrane fluidity can be decreased by which of the following mechanisms? decreasing the number of fatty acids attached to glycerol in membrane lipids increasing the number of carbons in the fatty acids of membrane lipids increasing the degree of unsaturation in the fatty acids of membrane lipids decreasing the number of membraned organelles in the eukaryotic cell increasing the number of branched-chain fatty acids of membrane lipids
In the "fluid " _______ cell membrane model, lipids are organized in a ________ arrangement, such that _______ portions of the lipids are exposed to either the interior or exterior of the cell, while the lipid portions are sandwiched in the middle of the membrane. As part of the cell membrane, a main function of peripheral proteins is to provide _________ , while a main function of proteins is to provide _________ . Other cell membrane molecules include a compound called __________, which functions to provide fluidity to rigid membranes and rigidity to fluid membranes; and surface carbohydrates, which function in the membrane not to provide energy, but instead to provide _________ _____ . Aminophospholipids (including PE and ) move to the inner leaflet of the membrane, by an enzyme known as the ._______ A main function of the cell membrane is to be very selective as to what is able to cross through, a condition known as a barrier.
A transmembrane protein has the following properties: it has two binding sites, one for solute A and one for solute b. The protein can undergo a conformational change to switch between two states: either both binding sites are exposed exclusively on one side of the membrane or both binding sites are exposed exclusively on the other side of the membrane. The protein can switch between the two conformational states only if both binding sites are occupied or if both binding sites are empty, but cannot switch if only one binding site is occupied. Do you need to specify any additional properties to turn this protein into a symport that couples the movement of solute A up its concentration gradient to the movement of solute b down its electrochemical gradient?
A transmembrane protein has the following properties: it has two binding sites, one for solute A and one for solute b. The protein can undergo a conformational change to switch between two states: either both binding sites are exposed exclusively on one side of the membrane or both binding sites are exposed exclusively on the other side of the membrane. The protein can switch between the two conformational states only if both binding sites are occupied or if both binding sites are empty, but cannot switch if only one binding site is occupied. What kind of protein do these properties define?
When fluorescein-dyed human proteins were first mixed with rhodamine-dyed mouse proteins (in mouse/human hybrid cell fusions carried out in the 1970s), these proteins appeared to exhibit: restricted movement, based on confinement by diffusion barriers restricted movement, based on tethering to extracellular molecules unrestricted movement, similar to membrane phospholipids restricted movement, based on anchoring to intracellular proteins restricted movement, based on attachment to other cells
When rhodamine-dyed mouse proteins were first mixed with fluorescein-dyed human proteins (in mouse/human hybrid cell fusions), these proteins appeared to exhibit: restricted movement, based on confinement by diffusion barriers restricted movement, based on tethering to extracellular molecules unrestricted movement, similar to membrane phospholipids restricted movement, based on anchoring to intracellular proteins restricted movement, based on attachment to other cells
Which of the following best describes an integral membrane protein? A.A protein that has an extracellular domain, a membrane-spanning domain that spans the lipid bilayer of the plasma membrane, and an intracellular domain. B.A protein that peripherally associates with the membrane via ionic interactions another protein embedded in the membrane. C.A protein that is soluble in the cytoplasm. D.A protein that peripherally associates with the membrane via ionic interactions between polar charged amino acids and the polar head groups of the phospholipids in the membrane.
Below are listed molecules with different chemical characteristics. Knowing that all molecules will eventually diffuse across a phospholipid bilayer, select the list that most accurately predicts the relative rates of diffusion of these molecules (fastest to slowest) across a biological membrane. alanine, propanol, sodium, estrogen sodium, propanol, alanine, estrogen estrogen, propanol, sodium, alanine estrogen, propanol, alanine, sodium