Short Answers Flashcards
Define Isotonic solution
-water and dissolved substances diffused into and out of the cell at the same rate
Define Hypertonic solution
-cell shrivels
-solute concentration is higher outside the cell
Define hypotonic solution
-cell swells
-solute concentration is higher inside the cell
Define endocytosis.
-process where cell surrounds and takes particles into the cell.
two types of endocytosis
-Phagocytosis: cell engulfs food particle
-Pinocytosis:cell engulf liquid drop
Define exocytosis
-secretion of materials out of the cell membrane
3 important things to know about cell theory
-All organisms are composed of one or more cells
-cell is the basic unit of structure and organization of organisms
-all cells comes from preexisting cells
Define compound light microscope
-utilize series of glass lenses and visible light to magnify an image
-magnify images up to 1,000 times than actual size
Define Electron Microscope
-use magnets to aim a beam of electrons at cell to produce image
-magnifies up to 500,000 times than actual size
Define prokaryote
-no nucleus
-simple structure
-contains plasma membrane
-does not have membrane-bound organelles
Define Eukaryotes
-have nucleus
-complex structure
-have plasma membrane
-have membrane-bound organelles
What are the parts of microscope?
-ocular eyepiece
-ocular tube
-revolving nosepiece
-arm
-Low-power objective
-medium-power objective
-high-power objective
-stage clips
-stage
-diaphragm
-course focusing knob
-fine focusing knob
-light source
-base
-inclination joint
function of ocular eyepiece
-lens you look through when viewing an object
function of ocular tube
-hollow tube that supports ocular and allows light to pass from objective to ocular lens
function of arm
-structural support for the functioning parts of microscope
function of revolving nosepiece
-contains 2-4 different lenses with different magnifications that can be rotated
function of objective lenses. how to determine which one is which
-complex lenses positioned directly above the slide to be viewed.
-low POV is the shortest
-high POV is the longest
function of coarse focusing knob
-used for lowest-power objective
-roughly focuses lens on an object by either by moving ocular tube or stage up and down.
function of fine focusing knob
-used for high-power
-moves stage or ocular tube a small distance and allows line tuning of the focus.
function of stage
-platform that contains a central opening that supports the slide
function of stage clips
-holds the slide in position
function of diaphragm
-regulates the amount of light reaching the slide.
function of light source
-reflects light through the hole in the stage and must be adjusted for maximum light
