indrcare 1. When the net movement of water in and out a cell is zero, that solut
ID: 190729 • Letter: I
Question
indrcare 1. When the net movement of water in and out a cell is zero, that solution is said to be: a. osmotic b. isotonic c. hypotonic d. hypertonic e. pressurized 2. Which statement best describes the activity of the sodium-potassium pump? a. It transports hydrogen ions out of the cell. b. It transports water directly out of the cell. c. It transports 2 sodium ions into the cell in exchange for 3 potassium ions. d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions. e. It transports 2 sodium ions out of the cell in exchange for 2 potassium ions. 3. Since sodium-potassium pumps transport sodium ions out of a cell and potassium ions into a cell, what type of carrier proteins are they? a. ion pumps b. uniporters c. symporters d. antiporters e. ABC transporter 4. You light a scented candle in the guest bathroom. Within a few minutes you can already smell the candle's scent throughout the hallway. What process is occurring? a. dialysis b. osmosis c. simple diffusion d. active transport e. facilitated diffusion 5. How are integral proteins unique in cell membranes? a. They have no hydrophobic portions. b. They are weakly bound to the surface of the membrane. c. They are only located on the inner side of a membrane. d. They are firmly bound to the membrane and can only be released with a detergent. e. They are completely embedded within the lipid bilayer with no exposure to the internal cell environment.Explanation / Answer
Answer 1st: B. isotonic
Explanation: In the isotonic solution, no water movement occurs in or out the cell.
Answer 2: d. It transports 3 sodium ions out of the cell in exchange for 2 potassium ions.
Explanation: Sodium-potassium pump's simple function is to pump 3 Na ions out for every 2 K ions.
Answer 3: a. ion pump
Answer 4: c. simple diffusion
explanation: when you light a scented candle in the guest washroom, its smell will diffuse in the air by simple diffusion.
Answer 5: d. They are firmly bound to the membrane and can only be released with a detergent.
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