Which of the following statements about meiosis is correct? MCQ with Answer and Explanation

Explanation:
pBR322 is a widely used cloning vector. The 'rop' gene (Repressor Of Primer) codes for a small polypeptide that regulates and helps in the replication of the plasmid by inhibiting the synthesis of the RNA primer required for plasmid DNA replication. The 'ampR' and 'tetR' genes confer resistance to ampicillin and tetracycline, respectively, serving as selectable markers. Exam tip: 'rop' = replication control; 'R' = resistance.

Explanation:
Golden rice is genetically engineered to produce beta-carotene (provitamin A) in the endosperm, to address vitamin A deficiency.

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.