In genetics, the 'Spliceosome' is a large, complex molecular machine found within the nucleus of eukaryotic cells. Its primary function is to: MCQ with Answer and Explanation

Explanation:
The Sinoatrial (SA) node, the natural pacemaker of the heart, is a small, specialized mass of autorhythmic cardiac muscle cells located in the upper wall of the right atrium, just below the opening of the superior vena cava. It spontaneously generates electrical impulses at a regular rate, which spread through the atrial myocardium, causing the atria to contract and push blood into the ventricles. The impulse then reaches the AV node.

Explanation:
Multiple Ovulation Embryo Transfer (MOET) is a reproductive technology used in cattle to rapidly multiply the offspring of superior females. Artificial insemination (AI) allows farmers to use semen from genetically superior bulls without keeping the animal, improving herd quality. Crossbreeding involves mating animals of different breeds to combine desirable traits and increase heterozygosity, thereby increasing, not reducing, genetic diversity in the population. Thus, statements 1 and 2 are correct.

Explanation:
The tundra biome, found in Arctic and Antarctic regions, has permanently frozen subsoil (permafrost), extremely low temperatures, short growing seasons, and vegetation limited to mosses, lichens, grasses, and dwarf shrubs. Taiga is the boreal coniferous forest, savanna is tropical grassland, temperate deciduous forest has distinct seasons. Tundra is the coldest biome.