The disease characterized by the inability to produce insulin is: MCQ with Answer and Explanation

Explanation:
Spermatogenesis is the production of haploid spermatozoa from diploid spermatogonia in the seminiferous tubules of the testes. Oogenesis is egg production, gametogenesis is the general term for both, fertilization is fusion.

Explanation:
The poly-A tail is a long chain of adenine nucleotides (typically 100-250) added to the 3' end of a pre-mRNA molecule during post-transcriptional processing in the nucleus. Its primary functions are to protect the mRNA molecule from enzymatic degradation in the cytoplasm (by exonucleases), to facilitate the export of the mature mRNA from the nucleus to the cytoplasm, and to promote translation by helping to recruit ribosomes. It also plays a role in determining the lifespan of the mRNA in the cytoplasm.

Explanation:
Vitamin K is a cofactor for the enzyme γ-glutamyl carboxylase, which adds carboxyl groups to glutamic acid residues in clotting factors II, VII, IX, and X, allowing them to bind calcium and participate in coagulation. Deficiency leads to bleeding tendency.