The scientist who discovered the concept of 'natural killer' cells was: MCQ with Answer and Explanation

Explanation:
The stomach secretes gastric juice containing hydrochloric acid and the enzyme pepsin, which initiates the digestion of proteins into smaller peptides. The small intestine is the primary site for the final digestion of food and the absorption of most nutrients (amino acids, simple sugars, fatty acids, vitamins) into the bloodstream through its villi. The large intestine (colon) primarily absorbs water, electrolytes, and some vitamins produced by gut bacteria, forming solid feces. All statements are correct.

Explanation:
The Emerson enhancement effect, discovered by Robert Emerson in 1957, provided crucial evidence for the existence of two distinct photosystems (PSI and PSII) in photosynthesis. He observed that the rate of photosynthesis (measured by oxygen evolution) under far-red light (>680 nm) alone was very low. However, when far-red light was combined with shorter wavelength red light (

Explanation:
Histology is the microscopic study of tissues—groups of cells with similar structure and function. Cytology deals with cells, anatomy with gross body structures, morphology with form and external features. Histological techniques involve staining and microscopy to examine tissue architecture in health and disease.