Hormones: Biochemistry and Function — DU B. Sc. (Hons) Biochemistry Previous Year Question Papers

There are 6 questions. 1. (A) Justify the following statements: (a). Vasopressin is called antidiuretic hormone. (b) Cretinism is associated with severe mental, retardation. (c) Pregnant women show hyperpigmentation. : (d). The pituitary is considered a dual gland both functionally and anatomically. (e) Growth, hormone is diabetogenic. Glucocorticoids are permissive in action. (B) Name the following : ** (a) The specific amino acid residue in the thyroglobulin protein that undergoes iodination to eventually form thyroxine. (b) Hypothalamic hormone which exerts a tonic inhibitory effect on the secretion of prolactin from the anterior pituitary. (c) Placental hormone which acts as a biological "analog" to LH, maintaining the corpus leteum during the first trimester of pregnancy. 12,3 2. Explain the following. : (a) Hormonal regulation of fight-or-flight response. (b) Dual role of cholecalciferol in physiology. (c) Positive feedback mechanism of oxytocin during parturition. 3. Explain the hormones-based homeostasis of the following : (c) Blood pressure. 5x3 4. (at) Discuss the hormonal interplay (FSH, LH, Estrogen, Progesterone) during the ovarian cycle. (b) Explain the steps involved in the synthésis of thyroxine. (c) - Explain the role of hormones of secietin family. ‹ 5x3 (a) Differentiate between osteoporosis and osteomalacia. (b) Explain with the help of an example, the long loop and short loop feedback regulatory mechanisms of hormone secretion. (c) Discuss the types and physiological actions of hormones in contraception. 5x3 (b) Type-II diabetes mellitus (e) Cushing's syndrome.