In cell junctions, _________ seal intercellular spaces, _______ reinforce allow
ID: 92202 • Letter: I
Question
In cell junctions, _________ seal intercellular spaces, _______ reinforce allow for communication between cells. keratins: desmosomes: connexins. tight junctions: desmosomes': gap junctions cell recognition molecules: adhesion molecules: tight junctions junction molecules: adhesion molecules, molecules: connexions desmosomes: gap junctions: tight junctions Biological membranes can control the internal composition of a cell or cell compartment by controlling membrane lipid composition. the concentration gradient of a solute. active transport. movement of water by carrier proteins. membrane selective permeability. The difference between osmosis and diffusion is that diffusion is passive transport, whereas osmosis is active transport. only in diffusion do molecules move from areas of high concentrations to areas of low concentration. only diffusion refers to the movement of materials across a semipermeable membrane. osmosis refers specifically to the movement of water, whereas diffusion is the movement of any molecule. the kinds of osmosis varies according to the kinds of particles present. Which of the following is an example of passive transport? Facilitated diffusion The sodium-potassium pump Turgor pressure ATP-driven transport Endocytosis
Explanation / Answer
Answer 1. In cell junction, tight junction seal intercellular spaces, desmosomes reinforce attachment and gap junction allow for communication between cells.
Tight junctions, are the closely associated areas of two cells whose membranes join together to form virtually impermeable barrier. Desmosomes provides strong adhesion between cells, they link intracellularly to the intermediate filament cytoskeleton and they form the adhesive bonds in a network that gives mechanical strength to tissues. Gap junctions directly connect the cytoplasm of two cells, which allows various molecules, ions and electrical impulses to pass through a regulated gate between cells.
Answer 2: Biological membranes can control the internal composition of a cell or cell compartment by controlling membrane selective permeability.
Selectively permeable cell membrane is one that allows molecules or ions to pass through it by active or passive transport.
Answer 3: The difference between osmosis and diffusion is that osmosis refers specifically to the movement of water, whereas diffusion is the movement of any molecule.
Answer 4: Facilitated diffusion is an example of passive transport.
Facilitated diffusion is a form of passive transport, which a transporter protein facilitates (or mediates) the movement molecule or ion across the plasma membrane down its concentration or electrochemical gradient.
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