Carrier molecules are utilised for ________. both active and passive transport
In plants, wilting of leaves and stems results from ________.
Plasmolysis
When a plant cell is placed in a hypotonic solution, the cell wall prevents ________. the cell from bursting
________ is the net movement of uncharged molecules from a low concentration to a higher concentration.
Active transport
The membrane potential across a cell creates a _________ charge inside the cell and a ________ charge outside the cell. negative/positive Eukaryotic cells import large molecules through the process of ________ and secrete larger molecules by ________. endocytosis/exocytosis In an aqueous environment, the phospholipids of a membrane ________.
Are arranged in a bilayer with the polar heads of each layer located at the surface
Certain organisms such as the striped bass (Morone saxatilis) are able to migrate between the ocean and freshwater streams. Consider when the striped bass migrates into freshwater streams; which one of the following situations would be necessary to maintain life?
Ions must be kept within the cells while water is kept out.
In what way do the various membranes of a cell differ?
Certain proteins are unique to each membrane.
The selective permeability of a membrane refers to ________. the ability of only certain molecules to pass across a membrane
Membrane sterols such as cholesterol function in animal cell membranes to ________. maintain membrane fluidity
When comparing the outside and inside halves of a cell membranes phospholipid bilayer, the composition of lipids on the two surfaces is ________.
Asymmetrical
According to the fluid mosaic model of cell membranes, the fluid part of the model refers to ________. the phospholipid molecules which vibrate, spin, and exchange places within the same layer, or leaflet, of the bilayer
When referring to membrane glycolipids and glycoproteins, the term glyco- indicates ________. polar carbohydrate groups are attached to the molecules
The selective permeability of a cell membrane is due to ________. the hydrophobic core formed by the phospholipid tails
Cells undergo exocytosis ________. to secrete protein and wastes from the cell
A transport system in which transport of an ion in one direction provides the energy for active transport in the opposite direction is known as ________. more than one answer is correct
The ________ is responsible for maintaining the membrane potential across the cell membrane.
Na+/K+ pump
An isotonic solution has a solute concentration ________ to the solute concentration inside the cell.
Equal
For osmosis to occur, ________. more than one answer is correct
A(n) ________ is created as ions diffuse across membranes. electrochemical gradient
The voltage across a membrane is called the ________. membrane potential
A(n) ________ environment is ideal for plant cells, while a(n) ________ environment is best for animal cells. hypotonic/isotonic Joe Scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies covalently linked to fluorescent dyes (antibodies to mouse proteins green; antibodies to human proteinsred). What does the cell look like immediately after fusion?
The cell is half red and half green.
Organisms must constantly bring in certain molecules and ions while keeping others out. This function is accomplished by ________. the plasma membrane
Endocytosis of nanotubes has shown promise for ________. the delivery of anticancer drugs to cancer cells
Eukaryotic cells import large molecules through the process of ________ and secrete larger molecules by ________. endocytosis/exocytosis The movement of water across a membrane from an area of lower solute concentration to a region of higher solute concentration is called ________. both diffusion and osmosis
Which of the following molecules demonstrate dual solubility characteristics? sterols, phospholipids, and proteins
