The disease caused by the human papillomavirus (HPV) is: MCQ with Answer and Explanation

Explanation:
Chief cells (peptic cells) in the gastric mucosa secrete pepsinogen, which is converted to active pepsin by HCl. Pepsin digests proteins into peptides. Parietal cells secrete HCl and intrinsic factor. Mucous cells produce mucus that protects the stomach lining. G cells secrete gastrin hormone. Pepsin functions optimally at pH 1.8-2.0. The stomach thus initiates protein digestion.

Explanation:
Arthropoda is the largest phylum, with over a million described species, including insects, arachnids, crustaceans, and myriapods. They are characterized by jointed appendages, chitinous exoskeleton, and segmented bodies. Insects alone represent the majority of animal species. Chordata is comparatively smaller.

Explanation:
The liver stores glycogen and produces bile. Insulin is produced by the beta cells of the pancreas. So 3 is incorrect.