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NEET Questions / Zoology / Chemical Coordination and Integration
Which biochemical pathway within the pineal gland is DIRECTLY responsible for converting serotonin to melatonin?
Tryptophan → 5-Hydroxytryptophan → Serotonin → Melatonin
Serotonin → N-acetylserotonin → Melatonin
Tyrosine → Dopa → Dopamine → Melatonin
Phenylalanine → Tyrosine → Melatonin
A patient presents with steatorrhea, hyperglycemia, and abdominal pain. Further investigation reveals significantly decreased levels of both insulin and pancreatic enzymes. Which of the following is the MOST likely underlying cause of this condition?
A tumor solely affecting the alpha cells of the Islets of Langerhans
Autoimmune destruction specifically targeting beta cells
Cystic fibrosis affecting the pancreas
Excessive consumption of alcohol leading to acute pancreatitis
A researcher is studying a novel pancreatic protease. This protease is activated by trypsin and exhibits optimal activity at pH 8.0. Which of the following is MOST likely true about this protease?
It is likely synthesized and stored in its active form within acinar cells.
It functions primarily in the acidic environment of the stomach.
It is likely involved in protein digestion in the small intestine.
It is likely a zymogen activated by enterokinase in the duodenum.
A mutation in the gene encoding for pancreatic lipase results in a non-functional enzyme. Which of the following would be the MOST direct consequence of this mutation?
Increased blood glucose levels
Reduced bicarbonate secretion
Impaired digestion and absorption of dietary fats
Elevated levels of pancreatic amylase
