The polysaccharide that serves as the main energy storage in animals is: MCQ with Answer and Explanation

Explanation:
Jonas Salk developed the inactivated polio vaccine (IPV) in 1955, which was the first effective vaccine. Albert Sabin later developed the oral polio vaccine (OPV). Pasteur rabies, Jenner smallpox.

Explanation:
Iron (Fe²⁺) is the central atom of heme in hemoglobin and myoglobin, essential for oxygen transport. Deficiency leads to microcytic hypochromic anemia. Good sources: liver, meat, leafy greens.

Explanation:
The proximal convoluted tubule (PCT) reabsorbs about 70-80% of electrolytes and water, and almost 100% of glucose, amino acids, and vitamins back into the blood via active transport and facilitated diffusion. The loop of Henle concentrates urine, the DCT reabsorbs sodium and water under hormonal control, and the collecting duct reabsorbs water (ADH-dependent). PCT cells have microvilli for increased surface area.