The enzyme secreted by the stomach that digests milk protein in infants is: MCQ with Answer and Explanation

Explanation:
Spermatogenesis is the process of formation of sperm cells (spermatozoa) from undifferentiated spermatogonia. This process occurs exclusively in the seminiferous tubules, which are highly coiled tubes located within the testes. The epididymis is where sperm mature and are stored, and the vas deferens transports them.

Explanation:
Edward Jenner, an English physician, is known as the 'father of immunology'. In 1796, he developed the world's first successful vaccine against smallpox. He observed that milkmaids who had contracted cowpox (a mild disease) were immune to smallpox. He inoculated a boy with material from a cowpox blister, successfully conferring immunity to smallpox, thus pioneering the concept of vaccination.

Explanation:
Crystallization is a property of non-living substances where molecules arrange in a definite pattern, e.g., salt crystals. Living organisms exhibit growth, reproduction, metabolism, cellular organization, and consciousness. Metabolism is a defining feature of all living organisms, occurring even in unicellular forms. Reproduction, though absent in sterile organisms like mules, is generally a characteristic. Growth in living beings is internal and intrinsic, unlike extrinsic accumulation in non-living things. Hence, crystallization is not a characteristic of life.