Consider statements about animal husbandry: 1. Artificial insemination improves cattle breeds. 2. Multiple Ovulation Embryo Transfer is used in poultry. 3. Crossbreeding combines traits of two breeds. Which are correct? 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:
O negative lacks A, B, and Rh antigens, so it can be given to anyone (RBCs). AB is universal recipient. Rh-negative lacks Rh antigen. Plasma is 90% water.

Explanation:
The Bundle of His and Purkinje fibers are part of the electrical conduction system of the heart. The Bundle of His carries the electrical impulse from the atrioventricular (AV) node down the interventricular septum. It then divides into right and left bundle branches, which terminate in the Purkinje fibers. These fibers rapidly distribute the impulse throughout the ventricular myocardium, ensuring coordinated ventricular contraction.