The vitamin deficiency that leads to pernicious anemia is: MCQ with Answer and Explanation

Explanation:
Telomerase is a ribonucleoprotein enzyme that adds repetitive nucleotide sequences to the ends of chromosomes (telomeres), preventing them from shortening during DNA replication. It is highly active in germ cells, stem cells, and most cancer cells, granting them replicative immortality. In most normal somatic cells, telomerase is inactive, leading to gradual telomere shortening and cellular aging.

Explanation:
Protista includes unicellular eukaryotes such as protozoans (Amoeba, Paramecium), unicellular algae (Chlamydomonas, diatoms), and slime molds. They may be autotrophic or heterotrophic. Monera contains prokaryotes. Fungi include multicellular (except yeast) saprophytes. Plantae includes multicellular autotrophs. The protist kingdom is a 'catch-all' group for eukaryotes not fitting into fungi, plantae, or animalia.

Explanation:
The liver is the primary organ for glycogenesis (storing glucose as glycogen) and glycogenolysis, maintaining blood glucose levels. Muscles store glycogen for local use. Pancreas regulates via hormones, kidneys excrete excess glucose.