WHAT ARE RIBOSOMES???
➤➤➤RIBOSOMES➤➤➤ ➤ DISCOVERED BY; ★ IN 1955, GEORGE EMIL PALADE WAS THE FIRST PERSON WHO STUDY THE RIBOSOME, USING ELECTRON MICROSCOPE. ➤ DEFINITION; ★ CELL CONTAINS MANY TINY GRANULAR STRUCTURES KNOWN AS "RIBOSOMES." ➤ EUKARYOTIC RIBOSOME; ★ EUKARYOTIC RIBOSOMES ARE COMPOSED OF AN ALMOST EQUAL AMOUNT OF RNA AND PROTEIN, HENCE THEY ARE RIBONUCLEOPROTEINS PARTICLES. ➤ RIBOSOMAL RNA; (rRNA) ★ THE RNA PRESENT IN RIBOSOME IS CALLED RIBOSOMAL RNA. ➤ FORMS OF RIBOSOME; ★ RIBOSOMES EXIST IN TWO FORMS; " EITHER FREELY DISPERSED IN CYTOPLASM OR ATTACHED WITH RER AS TINY GRANULES ." ➤ SUBUNITS; ★ EACH EUKARYOTIC RIBOSOME CONSISTS OF TWO SUB-UNITS. LARGER SUBUNIT; ★ THE LARGER SUBUNIT SEDIMENTS AT 60S. (S=SVEDBERG UNIT USED IN ULTRACENTRIFUGATION). SMALLER SUBUNIT; ★ WHILE SMALLER SUBUNIT SEDIMENTS AT 40S. THE RIBOSOMES ARE ATTACHED TO MESSENGER RNA THROUGH ...