Cell Membrane and Transport
Biology ⇒ Cell Biology
Cell Membrane and Transport starts at 7 and continues till grade 12.
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A cell is placed in a solution and water moves out of the cell. What type of solution is the cell in?
A cell is placed in an isotonic solution. What will happen to the cell?
Describe how temperature can affect the rate of diffusion across the cell membrane.
Describe the difference between passive and active transport across the cell membrane.
A cell is actively transporting calcium ions out of its cytoplasm into the extracellular fluid, even though the concentration of calcium is higher outside the cell. What does this indicate about the transport process?
A scientist observes that a cell placed in a certain solution swells and eventually bursts. Based on this observation, explain the direction of water movement and the type of solution the cell was placed in.
A cell is placed in a solution containing a high concentration of urea, a small polar molecule. Over time, the concentration of urea inside the cell increases rapidly, even though urea is polar. Which property of the cell membrane or its proteins best explains this observation?
A researcher observes that when a certain toxin is added to cells, ATP production is inhibited and the uptake of amino acids into the cell stops, but the diffusion of oxygen continues. What does this indicate about the transport mechanisms for amino acids and oxygen?
Which of the following best describes exocytosis?
(1) Movement of water out of the cell
(2) Release of substances from the cell by vesicle fusion with the membrane
(3) Uptake of solid particles by the cell
(4) Diffusion of gases across the membrane
Which of the following best describes the function of the cell membrane?
(1) Provides energy for the cell
(2) Controls the movement of substances in and out of the cell
(3) Synthesizes proteins
(4) Stores genetic information
Which of the following best describes the structure of the cell membrane?
(1) Rigid and impermeable
(2) Fluid mosaic model
(3) Single layer of phospholipids
(4) Made only of proteins
Which of the following best describes the term 'concentration gradient'?
(1) The movement of water across a membrane
(2) The difference in the concentration of a substance between two areas
(3) The energy required for active transport
(4) The structure of the cell membrane
A cell uses energy to move a substance from a low concentration to a high concentration. This process is called ______.
A plant cell placed in a hypertonic solution will ______.
A red blood cell placed in a hypotonic solution will ______.
Osmosis is the movement of water molecules from an area of ______ concentration to an area of ______ concentration across a selectively permeable membrane.
True or False: All molecules require a transport protein to cross the cell membrane.
True or False: Carrier proteins are involved in both facilitated diffusion and active transport.
True or False: Facilitated diffusion requires a membrane protein to help move substances across the membrane.
True or False: Simple diffusion and osmosis are both types of passive transport.
