Which of the following statements about enzymes is correct? MCQ with Answer and Explanation

Explanation:
Lymphatic filariasis (elephantiasis) is caused by Wuchereria bancrofti and transmitted by Culex mosquito. Malaria is Anopheles, dengue Aedes, leishmaniasis sandfly.

Explanation:
The pancreas functions as an exocrine gland (secreting digestive enzymes into the duodenum via the pancreatic duct) and an endocrine gland (secreting insulin, glucagon, somatostatin from the islets of Langerhans into the blood). Thyroid, pituitary, and adrenals are purely endocrine.

Explanation:
The nucleus is bounded by a double membrane called the nuclear envelope, not a single membrane. It houses the nucleolus, which is the site of ribosomal RNA synthesis. The nuclear envelope is perforated by nuclear pores that regulate the bidirectional transport of molecules, including the export of mRNA to the cytoplasm. Thus, statements 2 and 3 are correct.