Melanin is a pigment responsible for color in the skin, hair, and eyes. It is derived from the amino acid tyrosine. The process of melanin formation involves the enzyme tyrosinase, which converts tyrosine into dopaquinone, a precursor of melanin.
Therefore, the correct amino acid from which melanin is derived is Tyrosine.
A dipeptide, “x”, on complete hydrolysis gives “y” and “z”; “y” on treatment with aqueous HNO$_2$, produces lactic acid. On the other hand, “z” on heating gives the following cyclic molecule.
Based on the information given, the dipeptide X is:
Which of the following diagnoses give the hematological picture as given below?
A 34-year-old male presents with a history of progressive lower backache and early morning stiffness for the past 6 months. His symptoms are more severe in the morning and improve on exercise. He is a known case of ulcerative colitis an x-ray of his lumbar spine is taken and is given below. What is the most likely diagnosis?
A patient presents with swelling and tenderness in the anatomical snuffbox after sustaining a fall on their outstretched hand. The image given below shows the cast used to manage the patient’s injury. Identify the fracture.
A 23-year-old male had acute appendicitis 3 days ago and presented to the surgery department with abdominal pain and tenderness. Which of the following incisions would be appropriate for this condition?
A 74-year-old gentleman presents to the OPD with a history of significant unintentional weight loss, loss of appetite, and iron deficiency anemia. A chest x-ray was done and is given below. What is the diagnosis?