The 'Hormone Ghrelin' is often called the 'hunger hormone' because it is secreted primarily by the stomach and acts on the hypothalamus to: MCQ with Answer and Explanation

Explanation:
Saturated fatty acids have no double bonds between the carbon atoms in their hydrocarbon chain, making them 'saturated' with hydrogen atoms. They are typically solid at room temperature. Palmitic acid and stearic acid are common saturated fats. Oleic, linoleic, and linolenic acids are unsaturated fatty acids, containing one or more double bonds.

Explanation:
Photolysis of water provides electrons and protons for the light reactions, releasing O₂; NADPH formed carries hydrogen to reduce CO₂ in the Calvin cycle. R correctly explains A.

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.