PROKARYOTIC CELLS

HAVE NO CLEAR NUCLEAR MEMBRANE

HAVE NO INTERNAL MEMBRANES (NO ORGANELLES)

NO MITOTIC APPARATUS (SPINDLES, ETC. )

NO NUCLEOLI

HAVE A SINGLE CHROMOSOME FORMED IN A RING.

EXTANT

LIVING NOW

EXTANT PROKARYOTES INCLUDE

BACTERIA, BLUE-GREEN ALAGE, AND MYCOPLASMS. BACTERIA OR BLUE-GREENS ARE CONSIDERED TO HAVE BEEN THE FIRST LIFE FORMS ON EARTH.

BACTERIA ARE MOST IMPORTANT BECAUSE

DECOMPOSERS, SYMBIENT, MUTUALISM, PARASITIAM.

THERE ALL MANY MORE SPECIES OF BENEFICIAL BACTERIA THAN ONES HARMFUL TO MAN AND ANIMALS.

PRACTICALLY ALL LIFE FORMS HAVE C0-EVOLVED WITH BACTERIAL

EUKARYOTIC CELLS

HAVE A DEVELOPED NUCLEAR MEMBRANCE ENVELOPING FORMED, MULTIPLE CHROMOSOMES.

THEY HAVE TRUE MITOSIS AND POSSESS NUCLEOLI.

DO ORGANELIES FUNCTION INDEPENDENTLY?

IS THE CELL INTERIOR VERY DYNAMIC?

DOES IT MAINTAIN HOMEOSTASIS?

ONLY AS PART OF THE ENTIRE CELL.

YES ITS DYNAMIC

YES IT MAINTAINS HOMEOSTASIS

what is the most important structure in a cell?

the membrane

WHAT DOES CELL SURVIVIAL HINGE ON?

PROPER FUNCTIONING OF THE MEMBRANE

WHAT OCCURS WHEN THERE IS DAMAMGE TO THE CELL MEMBRANE?

PATHOLOGY

FUNCTIONS OF THE MEMBRANE

-FORM PHYSICAL BARRIERS

-COMPARTMENTALIZE

-ENCLOSE AND PROTECT CELLULAR AND ORGANELE CONTENTS.

-ELECTRICAL SIGNAL CONDUCTION IN NERVE AND MUSCLES.

-CREATE MUCH SURFACE AREA FOR THE MYRIAD OF CHEMICAL REACTIONS THERE.