Which of the following is a macronutrient for plants? MCQ with Answer and Explanation

Explanation:
Prolactin (PRL) is a peptide hormone secreted by the lactotroph cells of the anterior pituitary gland. Its primary and namesake function is to stimulate the development of the mammary glands during pregnancy and to initiate and maintain the production of milk (lactogenesis) after childbirth. While prolactin levels rise significantly during pregnancy, the high levels of estrogen and progesterone inhibit actual milk secretion until after delivery. Suckling by the infant is the primary stimulus for continued prolactin release.

Explanation:
Lactate dehydrogenase (LDH) reduces pyruvate to lactate using NADH, regenerating NAD⁺ for glycolysis under anaerobic conditions. Pyruvate decarboxylase is in alcoholic fermentation, alcohol dehydrogenase converts acetaldehyde to ethanol, pyruvate kinase is in glycolysis.

Explanation:
Peyer's patches are organized lymphoid follicles (aggregated lymphoid nodules) located in the mucosa and submucosa of the small intestine, most abundantly in the ileum (the distal part). They are a crucial component of the gut-associated lymphoid tissue (GALT) and play a vital role in monitoring intestinal bacteria populations, preventing the growth of pathogenic bacteria, and training the immune system to recognize antigens.