plasma membranes Flashcards
what is plasmolysis
when plants cell membranes pull away from the cell wall due to loosing water in a hypertonic environment
what is a phospholipid made of
a phosphate head (polar), 2 fatty acid tail (non-polar), and a glycerol
2 types of proteins in plasma membrane
intergral and peripheral
factors that effect movement across the plasma membrane
size, polarity, concentration gradient
why is it called the fluid mosaic model
because it describes the structure of the plasma membrane as a mosaic of components that give the membrane a fluid character
difference between passive and active transport
both require protein transporters, active requires ATP and is against the concentration gradient while passive does not require energy and is with the concentration gradient
types of endocytosis
pinocytosis (extracellular fluid) and phagocytosis (large molecules), and receptor mediated endocytosis
hypotonic vs hypertonic
hypotonic: solute concentration is lower outside of cell then inside cell (water enters cell), Hypertonic: solute concentration is higher outside then inside (water leaves cell)
role of ribosomes
to create proteins by converting genetic code into amino acid sequences
role of endoplasmic reticulum
to make, process and package proteins and lipids for transport
role of the golgi body
to process and package proteins and lipids, especially for export
role of vesicles
to store and transport materials
what is exocytosis
the bulk transport of materials outside of a cell
what is endocytosis
the bulk transport of substances into the cell
which substances can diffuse through the plasma membrane? hydrophilic or hydrophobic
hydrophobic
