TFUL 5 Flashcards
Chemically, ribosomes are made up of ___ and ___.
ribonucleioprotein, ie protein, and rRNA.
Dense, round bodies that may occur freely in the cytoplasm are known as ___ ribosomes.
Free
Ribosomes that remain attached to the surface of endoplasmic reticulum are known as ___ ribosomes.
Bound
Ribosomes help in the process of __.
Protein synthesis.
Ribosomes are called the ______ _______ of the cell.
Protein factories.
Each ribosome consists of two unequal subunits, ________ and ____.
Larger dome shaped and smaller ovoid.
Cytoplasmic ribosomes of Eukaryotes: ____
Ribosomes of Prokaryotic cells, mitochondria and chloroplast: ____
80S, 70S
True or False: In higher plants, the centrosome is present.
False. In higher plants, the centrosome is present.
True or False: Centrosome is not bounded by any membrane
True
Where are centrosomes found?
Centrosomes are distinct regions in the cytoplasm close to the nucleus.
Describe the function of centrosomes.
By arranging spindle fibres, they assist in cell division.
What are vacuoles?
Vacuoles are membrane bound non - cytoplasmic sacs that contain non living liquid or solid contents.
The covering membrane of the sap vacuole is called ____.
Tonoplast.
Differentiate between the following:
Plasmodesmata
Tonoplast
Leucoplast
Plasmodesmata - These are cytoplasmic connections and they maintain continuity of cytoplasm among the neighbouring cells.
Tonoplast - the covering membrane of the sap vacuole.
Leucoplast - colourless plastid used for food storage.
Has different types: Aleuroplast (Protein), Elaioplast (Oil), Amyloplast (Starch).
Mention the functions of sap vacuole
1) Stores salts, sugar, amino acid, organic acids and some proteins.
2) Garbage dump of the cell.
3) maintains turgidity and rigidity of the cell
4) osmotic absorption.
