Electrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest... a.The inner surface surface of the cell membrane is more negatively charged than the outer surface. b. the inner surface of the cell membrane is more positively charged than the outer surface. c. The membrane as a whole is hydrophilic on the outside. d. the membrane as a whole is hydrophobic on the outside e.None of the above

Electrical gradients ( potential; charges) exists on cell membranes because in part when the cell is at rest... a.The inner surface surface of the cell membrane is more negatively charged than the outer surface. b. the inner surface of the cell membrane is more positively charged than the outer surface. c. The membrane as a whole is hydrophilic on the outside. d. the membrane as a whole is hydrophobic on the outside e.None of the above

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter3: Cell Structure And Function

Section: Chapter Questions

Problem 11RQ: The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a....

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The tails of the phospholipids of the plasma membrane are composed of _____ and are _____? a. phosphate groups; hydrophobic b. fatty acid groups; hydrophilic c. phosphate groups; hydrophilic d. fatty acid groups; hydrophobic
Cell membranes consists mainly of ________ and ________ . a. lipids; carbohydrates c. lipids; phospholipids b. phospholipids; protein d. phospholipids; ECM
How do bile salts remove excess cholesterol from the body a) Bile salts stabilize deposited cholesterol b) cholesterol is converted to bile salts that are later eliminated through feces. c) Both of these processes remove cholesterol from the body d) None of these processes remove excess cholesterol from the body Which of the following statements is true of cell membrane proteins? a) They are suspended on the surface of the membrane. b) They are partly embedded in the bilayer. c) They span across the bilayer and project from both sides d) Any of these are true, depending on the specific membrane protein
In animal cells, lysosomes are the organelles in charge of digesting enzymes withnutrients that the cell consumes. If all the lysosomes in a cell were to break, what wouldwould initially happen to the cell?A. Molecules within it would degrade.B. It would lose all the water in the cytoplasm.C. There would be no cellular respiration.D. No proteins would form.
The plasma membrane is said to be a fluid-mosaic model because it contains a. waxes suspended within a mosaic of phospholipids.b. a mosaic of proteins suspended within a phospholipid bilayer.c. a polysaccharide mosaic suspended within a protein bilayer.d. a mosaic of phospholipids suspended within a protein bilayer.
Which of the following is true about motion of membrane lipids? A. They can move most rapidly when in the gel phase. B. Lateral diffusion is catalyzed by flippase proteins. C. To increase the fluidity of membranes at low temperatures, cells synthesize more saturated fatty acids and fewer unsaturated fatty acids. D. Transbilayer diffusion involves the transfer of lipids from one face of the bilayer to another.
For biological membranes, which of the following statement is NOT true? A. The phospholipid bilayer is a fluid matrix. B. Protein can be anchored to the membrane by covalently linked lipid chains. C. Proteins can move laterally across the membrane. D. For organisms living in cold temperature, their cell membranes contain more triacylglycerols. E. Transverse motion of lipid molecules can occur occasionally. Enzyme lowers when... A. The energy difference between the substrate and the transition state B. The energy difference between the product and the transition state C. Both A and B D. Neither A nor B
Which macromolecule is a primary component of cell walls, and which argument provides evidence for how the structure of this molecule relates to its purpose within the cell wall? A Lipids are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. B Lipids are the primary component, and they protect the cell and help maintain its shape because they form carbon rings. C Carbohydrates are the primary component, and they repel and prevent excess uptake of water because they form carbon chains. D Carbohydrates are the primary component, and they protect the cell and help maintain its shape because they form carbon rings.
which of the following statements is correct about the movement of water across a plasma membrane a. it cannot pass through any ion channels b. it moves through the membrane via mediated transport c. even though it a polar molecule, it moves readily through the nonpolar lipid bilayer d. artificial lipid membranes are impermeable to water
Which of the following statements about cellular membranes is/are FALSE? A. Only lipids move Within the membrane, while the proteins are anchored and immobile. B. Membranes are composed of lipids and proteins. C. Substances may be transported across membranes by active transport, facilitated transport or diffusion. D. Membrane proteins are classified as integral or peripheral, upon their function
Which of the following can most easily pass through the phospholipid bilayer of the cell plasma membrane without the involvement of proteins? A. small non-polar molecules B. small polar molecules C. large non-polar molecules D. large polar molecules
In cell membrane, the regulation of membrane rigidity is the function of _____. While proteins ______ A. Carbohydrates; Cell recognition B. Cholesterol; Move nutrients and electrolytes across C. Lipid; Impart polarity to the interior membrane D. Fatty acids; Prevent tight packing of fatty acid chains E.Cholesterol; Act as receptors for neurotransmitter and hormone binding