The enzyme that catalyzes the synthesis of RNA primer during DNA replication is: MCQ with Answer and Explanation

Explanation:
The diaphragm is a dome-shaped skeletal muscle that separates the thoracic cavity (lungs, heart) from the abdominal cavity. It is the primary muscle of inspiration. Pleura lines lungs, peritoneum lines abdomen.

Explanation:
Enterokinase (enteropeptidase), secreted by the duodenal mucosa, is the specific activator of pancreatic trypsinogen, converting it to active trypsin. Trypsin then activates other pancreatic zymogens (chymotrypsinogen, procarboxypeptidase). This cascade ensures that potent digestive enzymes are activated only in the intestinal lumen, preventing autodigestion of the pancreas.

Explanation:
Veins have thinner walls and larger lumens; arteries are thick and elastic; capillaries are thin for exchange; venules are larger than capillaries. Valves are in veins.