C Description of membrane structure BDiffusion of molecules through transport proteins ADifference in amount of Solute across membrane D Diffusion of water across a membrane F Only some molecules can diffuse easily E Membrane is made stiffer (less fluid) A. Osmosis B. Selective Permeability C. Fluid Mosaic D. Facilitated Diffusion E. Concentration Gradient F. Cholesterol

C Description of membrane structure BDiffusion of molecules through transport proteins ADifference in amount of Solute across membrane D Diffusion of water across a membrane F Only some molecules can diffuse easily E Membrane is made stiffer (less fluid) A. Osmosis B. Selective Permeability C. Fluid Mosaic D. Facilitated Diffusion E. Concentration Gradient F. Cholesterol

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 12RQ: Water moves via osmosis _______. a. throughout the cytoplasm b. from an area with a high...

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Water moves via osmosis _______. a. throughout the cytoplasm b. from an area with a high concentration of other solutes to a lower one c. from an area with a low concentration of solutes to an area with a higher one d. from an area with a low concentration of water to one of higher concentration
Solutes tend to diffuse from a region where they are _______ concentrated to an adjacent region where they are _______ concentrated. a. more, less b. less, more c. movement is independent of concentration
A plasma membrane ________. a. controls exchanges between the cell and the external environment b. is a mesh of intermediate filaments c. is a type of extracellular matrix
Most of a membranes diverse functions are carried out by ________ . a. proteins c. nucleic acids b. phospholipids d. hormones
The three fundamental classes of proteins involved in transport across membranes are: i) channelsii) pumpsiii) exchangers For each class, describe its essential features, explain how transport is accomplished and name at least one representative example.
Whether in a gas, a liquid, or a semisolid, diffusion always occurs a). at the same rate. b). from high to low solute concentration. c). faster at lower temperaturesd). from low to high solute concentration.
20. Active transport of a substanceacross a membrane requires A A gradientB the expenditure of ATPCwaterD diffusion
Movement of phospholipids from side to side is calleda) Facilitated diffusionb) Lateral diffusionc) Transverse diffusiond) Simple diffusion
Movement of phospholipids to opposite sides is calleda) Facilitated diffusionb) Lateral diffusionc) Transverse diffusiond) Simple diffusion
Fast block to polyspermy is achieved by a. actin polymerization b. action potential c. osmosis d. membrane depolarization e. exocytosis
Plasma membrane is permeable toa) ATPb) Glucosec) K+d) Urea
What variable(s) influence(s) whether a nonpolar molecule can move across a membrane by passive diffusion? a. The structure of the phospholipids bilayer b. The difference in concentration of the molecule across the membrane c. The presence of transport proteins in the membrane d. All of the choices are correct.