The vitamin that is required for the synthesis of melanin is:
A. Vitamin D
B. Vitamin C
C. Vitamin B₆
D. Vitamin A
Answer: Option B
Solution (By JKExamLibrary)
Vitamin C is a cofactor for the enzyme tyrosinase, which is involved in melanin synthesis. Vitamin A is for vision, B₆ for amino acid metabolism, D for calcium.
Explanation:
The mitochondrial matrix contains all Krebs cycle enzymes (except succinate dehydrogenase). Thus, the location is due to enzyme presence. R correctly explains A.
Explanation:
Myoglobin is an oxygen-binding protein in muscle cells, containing a single heme group. It has a higher affinity for oxygen than hemoglobin, facilitating oxygen diffusion and storage in muscles. Hemoglobin is in blood, ferritin stores iron, transferrin transports iron.
Explanation:
The hypothalamus contains numerous nuclei, each with specific functions. The supraoptic nucleus (SON) and the paraventricular nucleus (PVN) are large neurosecretory nuclei located in the anterior hypothalamus. The supraoptic nucleus primarily synthesizes Antidiuretic Hormone (ADH, or vasopressin), while the paraventricular nucleus primarily synthesizes Oxytocin (though both nuclei produce both hormones in smaller amounts). These hormones are transported down the axons of these neurons and stored in the posterior pituitary for release into the bloodstream.
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