The vitamin that functions as an antioxidant and is also known as tocopherol is: MCQ with Answer and Explanation

Explanation:
In a closed circulatory system (e.g., humans, annelids, cephalopods), blood is always enclosed within vessels (arteries, veins, capillaries) and is distinct from interstitial fluid. Open systems (arthropods, most mollusks) have hemolymph bathing organs in sinuses. The lymphatic system returns fluid to blood. A portal system connects two capillary beds.

Explanation:
Insulin is a peptide hormone produced by the beta cells of the Islets of Langerhans in the pancreas. It is initially synthesized as a single, inactive polypeptide precursor called proinsulin. During processing, a connecting peptide (C-peptide) is removed, leaving two polypeptide chains: the A chain (21 amino acids) and the B chain (30 amino acids). These two chains are held together by two interchain disulfide bridges (covalent bonds between sulfur atoms of cysteine residues), and there is also one intrachain disulfide bridge within the A chain.

Explanation:
Naja naja is the binomial name of the spectacled cobra, common in India. Vipera russellii is Russell's viper, Bungarus fasciatus is the banded krait, Ophiophagus hannah is the king cobra. Binomial nomenclature was introduced by Carolus Linnaeus to provide a universal naming system.