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BSC1010-Membranes

PBSC-BSC-Membrane Structure & Function

QuestionAnswer
The term for membranes which allow some molecules to pass through while blocking passage of other molecules. Selective Permeability
Another name for passive transport. Facilitated Diffusion
Equal solute concentrations. isotonic
When the solute concentration is less. Hypotonic
Small sacs (circles) of membrane are called _______. vesicles
This is the diffusion of water. Osmosis
Which region of the phospholipid molecule is hydrophyllic? The Glycerol Head
Is it the proteins or the fatty acid tails which are responsible for giving the "Fluid Mosaic Model" of the plasma membrane its MOSAIC portion of the name? The insertion of the proteins.
A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Is the solution surrounding the cell considered hypotonic or hypertonic? The solution surrounding the cell is considered hypertonic .
Does diffusion move molecules down or up the concentration gradient? Down
The process a cell uses to bring particles into the cell by pinching off a small circle of membrane to form a vesicle enclosing the particles. Endocytosis
In a solution consisting of salt dissolved in water, which is the solute? salt
Which region of the phospholipid molecule is hydrophobic? Fatty Acid Tails
When the solute concentration is greater. Hypertonic
This method of moving molecules across the membrane uses proteins embedded in the membrane, and uses ATP energy to move molecules against (up) the concentration gradient. Active Transport
A cell with an internal salt concentration of 0.1% salt is placed in a solution of 2% salt solution. Which way will water move, into or out of the cell? Out of the cell.
This method of moving molecules across the membrane uses proteins embedded in the membrane, but does not use ATP energy. It also moves molecules down the concentration gradient. Passive Transport
Is the glycerol head of a phospholipid molecule polar or non-polar? Polar
The process whereby vesicles fuse with the plasma membrane and are able to "dump" the contents to the outside of the cell. Exocytosis