Eukaryotic Cells

Answer (b) Pinocytosis

Answer (c) Protein and lipid

Middle lamella is a thin, amorphous and cementing layer between two adjacent plant cells. Middle lamella is the first layer which is deposited at the time of cytokinesis. It is made up of calcium and magnesium pectates. The softening of ripe fruits is caused by partial solubilisation of pectic compounds to produce jelly-like consistency.

Lysosomes are small vesicles which are bounded by a single membrane and contain hydrolytic enzymes in the form of minute crystalline or semicrystalline granules of 5-8 nm. The important enzymes are acid phosphatases, sulphatases, proteases, peptidases, nucleases, lipases and carbohydrases. They are also called acid hydrolases because these digestive enzymes usually function in acidic medium or pH of 4-5.

Microtubules are submicroscopic tubules of protein tubulin which develop on specific nucleating regions.