Which of the following Archaebacteria is responsible for the production of biogas from animal waste? MCQ with Answer and Explanation

Explanation:
Sulfur is present in the amino acids methionine and cysteine (which forms disulfide bonds in proteins). Nitrogen is in all amino acids, phosphorus in nucleic acids and ATP, iron in heme. Sulfur is also in vitamins biotin and thiamine. Disulfide bonds are crucial for protein tertiary structure.

Explanation:
Gastric Inhibitory Peptide (GIP), now more commonly called Glucose-dependent Insulinotropic Peptide, is an incretin hormone secreted by the K cells of the small intestine in response to the ingestion of food, particularly glucose and fats. Its name reflects its two main actions: 1) It inhibits gastric acid secretion and slows gastric emptying (the 'gastric inhibitory' effect). 2) In the presence of elevated blood glucose, it potently stimulates the beta cells of the pancreas to secrete insulin (the 'insulinotropic' effect), preparing the body to handle the incoming nutrients.

Explanation:
Cataract is clouding of the crystalline lens, causing blurred vision and eventual blindness if untreated. It is often age-related or due to UV exposure. Myopia is nearsightedness, glaucoma optic nerve damage, astigmatism irregular curvature. Cataract is treated by surgical removal and lens replacement.