The enzyme that breaks down acetylcholine in the synaptic cleft is: MCQ with Answer and Explanation

Explanation:
Thymosin is a group of peptide hormones secreted by the epithelial cells of the thymus gland. The thymus is the primary site for the maturation of T-lymphocytes (T cells), which are essential for cell-mediated immunity. Thymosin plays a critical role in this process by promoting the differentiation, development, and maturation of immature T cells (thymocytes) into functional, immunocompetent T cells. As the thymus involutes (shrinks) after puberty, thymosin levels decline.

Explanation:
Robert Brown, a Scottish botanist, first described the nucleus in 1831 while studying epidermal cells of orchids. Hooke discovered cells, Leeuwenhoek observed living cells, Virchow proposed that cells arise from pre-existing cells. Brown's discovery was pivotal for understanding cellular organization.

Explanation:
DNA polymerase catalyzes the formation of phosphodiester bonds between adjacent nucleotides, extending the new strand complementary to the template. Helicase unwinds DNA, ligase joins fragments, primase synthesizes RNA primer. In prokaryotes, DNA polymerase III is the main replicative enzyme.