CELL ORGANELLES
Ribosomes: They are small round mass.They are a type of
cell that makes protein, that is needed for many cell
functions such as repairing damage or directing chemical
processes. Ribosomes can be found floating within the
cytoplasm or attached to the endoplasmic reticulum.
Rough Endoplasmic Reticulum: Rough endoplasmic
reticulum contains ribosomes on its surface which makes
it rough. Functions of rough endoplasmic reticulum are:
. Manufacture of lysosome enzymes
. Manufacture of secreted proteins
Smooth Endoplasmic Reticulum: Endoplasmic reticulum
which don’t have attached ribosomes. Its function is to
synthesis substances such as fats, it converts harmful
substances into harmless materials.
QUESTIONS: WHAT IS THE FUNCTION OF RER?
EUKARYOTIC CELLS: CELLS WITH A NUCLEUS AND
MEMBRANE ENCLOSED OROANELLES ARE CALLED EUKARYOTIC
CELLS e.g. PLANT AND ANIMAL CELLS.
PROKARAYOTIC CELLS: CELLS WITHOUT A NUCLEUS
AND MEMBRANE ENCLOSED ORGANELLES ARE CALLED
PROKARYOTIC CELL e.g. BACTERIA AND VIRUS
CYTOSKELETON: CELL MAINTAINS ITS SHAPE
THROUGH A CYTOSKELETON. THIS STRUCTURE
CONTAINS MICROFILAMENTS (THREAD LIKE
STRUCTURES) AND MICROTUBLES (HOLLOW
TUBES).
VACUOLE: A vacuole is a fluid filled space enclosed by
membrane. Vacuoles store substances within a cell.
PLANT CELL have large vacuole which contains cell
sap. Cell sap contains sugars, minerals salts and
amino acids. Large vacuole is enclosed by a partially
permeable membrane called TONOPLAST.
DIFFERENCE BETWEEN ANIMAL AND PLANT CELL:
PLANT CELL
ANIMAL CELL
CELL WALL PRESENT
CELL WALL ABSENT
CHLOROPLAST PRESENT
CHLOROPLAST ABSENT
LARGE VACUOLE PRESENT
SMALL VACUOLE AND MANY PRESENT
CENTRIOLES ABSENT
CENTRIOLES PRESENT