Flashcards in The Cell Deck (34):
Uses two lenses: eyepiece and objective lens.
Eye piece lens
rotates to move the desired lens into place
magnifies the image
supports the slide
focuses light onto the slide.
adjusts the amount of light reaching the slide.
Stage height adjustor
moves the stage up and down
holds slide in place
for precise focussing
for rough focussing
all living parts of the cell
all living material in a cell outside of the nucleus.
consists of salts, sugars and pigments.
the detail of a cell as seen through an electron microscope
Transmission Electron Microscope TEM
shows internal structure of specimen in great detail.
Scanning Electron Microscope
shows surface view of specimen.
Role of Vacuole
gives cell shape and structure. Stores materials eg. cell sap
Role of Cell Wall
protects plant, turgidity of plant, gives strength
Role of Cell Membrane
-retains cell contents
-Recognises materials that touch it.
-controls what enters and leaves the cell.
-gives some support to the cell.
Role of the nucleus
control centre of the cell
the name given to chromosomes when they are elongated and not dividing.
Role of Nuclear Pores
allows mRNA to pass in and out of nucleus.
Role of Nucleolus
Role of Mitochondria
supplies energy to the cell.
Role of Chloroplats
green structures in plants in which photosynthesis takes place.
Role of Ribosomes
to make proteins
cells that do not have a nucleus or membrane-enclosed organelles.
have a nucleus and organelles, all of which are enclosed by membranes.
a group of similar cells that have been adapted to carry out the same function.
the growth of cells in a sterile environment in an artificial medium outside an organism.
a structure composed of a number of tissues that work together to carry out one or more functions.