Gregor Mendel is known as the 'father of genetics' for his experiments on: MCQ with Answer and Explanation

Explanation:
The variable (V) region at the tips of the antibody Y-shape contains the antigen-binding site, which is specific to a particular antigen. The constant region determines the class (IgG, IgM, etc.) and effector functions. The Fc region binds to immune cell receptors. Variability in the V region is generated by gene rearrangement, allowing immense antibody diversity.

Explanation:
Oxytocin (and ADH/vasopressin) are peptide hormones synthesized by the neurosecretory cells of the hypothalamus (supraoptic and paraventricular nuclei). They are transported down the axons of these neurons and stored in the nerve terminals of the posterior pituitary (neurohypophysis). Upon neural stimulation, they are released directly into the bloodstream from the posterior pituitary. The anterior pituitary synthesizes its own hormones.

Explanation:
Ciliated pseudostratified columnar epithelium (with goblet cells) lines the trachea and bronchi; the cilia beat in coordinated waves to move mucus and trapped particles out of the airways. Squamous epithelium is flat (alveoli), cuboidal in kidney tubules, transitional in urinary bladder.