usdu2 submissions, attempt.d2 isprv -åqj-22130578al 213915198isn 1523189 Questio
ID: 210374 • Letter: U
Question
usdu2 submissions, attempt.d2 isprv -åqj-22130578al 213915198isn 1523189 Question 13 Which of these statements describes some aspect of facilitated diffusion? There is only one kind of protein pore for facilitated diffusion. Facilitated diffusion requires energy to drive a concentration gradient Facilitated diffusion is another name for osmosis Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane. Question 15 0/1p A sodium-potassium pump moves three potassium ions out of a cell and two sodium ions into a cell while producing ATP for each cycle moves three sodium ions out of a cell and two potassium ions into a cell using energy from ATP hydrolysis moves three potassium ions out of a cell and two sodium ions into a cell using energy from ATP hydrolysis e move three sodium ions out of a cell and two potassium ions into a cell and generates an ATP in each cycle Attempt Score:12 / 15-80 %Explanation / Answer
Answer:
14). Facilitated diffusion of solutes may occur through channel or transport proteins in the membrane.
Explanation:
There are hundreds of different proteins throughout the cell, only two types are found associated with facilitated diffusion: channel proteins and carrier proteins. Facilitated diffusion, also called carrier-mediated osmosis, is the movement of molecules across the cell membrane via special transport proteins that are embedded within the cellular membrane. It does not directly involve high-energy molecules. It is a specific type of passive transport specific to large molecules, such as glucose, polar molecules, such as water, or ions, such as Na+.
15). Moves three sodium ions out of a cell and two potassium ions into a cell using energy from ATP hydrolysis.
Explanaation:
The Na+/K+ -ATPase enzyme is a solute pump that pumps sodium out of cells while pumping potassium into cells, both against their concentration gradients. This pumping is active (i.e. it uses energy from ATP). For every ATP molecule that the pump uses, three sodium ions are exported and two potassium ions are imported; there is hence a net export of a single positive charge per pump cycle.
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