Cell Biology and Structure

The basement membrane is composed of laminin, nidogen/entactin, heparan sulfate proteoglycans, and Type IV collagen. These components form the structural and functional barrier between epithelial cells and underlying connective tissue. Rhodopsin is a light-sensitive pigment found exclusively in retinal photoreceptor cells for vision, completely unrelated to basement membrane structure.

Reye's syndrome is characterized ultrastructurally by mitochondrial injury manifesting as mitochondrial blebs and enlarged mitochondria with disrupted cristae. This reflects the mitochondrial dysfunction central to the pathophysiology. Glycogen depletion (option B) is a nonspecific finding seen in many metabolic conditions. ER dilation and perinuclear staining are not characteristic ultrastructural features of Reye's syndrome.

Correct answer is (2). 

Clathrin is a protein that plays a major role in formation of coated vesicles.

Minimum regeneration power is present in the nervous system. 

Golgi body originates from the endoplasmic reticulum.

The arrangement of lipid molecules in a plasma membrane is known as head parallel. 

Quantasomes are particles found in the thylakoid membrane of chloroplasts in which photosynthesis takes place. 

Hydrolytic enzymes are found in lysosomes.

Nuclear membrane contains nuclear pores that help in exchange of materials between cytoplasm and nucleus.

Ribosome may also be called ribonucleoprotein as they are made up of RNA and proteins. 

Carbon is the principal structural element of living cells. It forms the backbone of all organic molecules including carbohydrates, proteins, lipids, and nucleic acids, which are the fundamental building blocks of cellular structure and function.

Mast cells are cells of connective tissue. They release histamine in time of inflammation. But in normal pulp, unlike other connective tissues, mast cells are not there and appear only during inflammation.

Root hairs are unicellular.