Description : Calcitomica is antagonist to (A) Serotonin (B) Thyroxine (C) Tri iodo thyronine (D) Para thyroid hormone
Last Answer : Answer : D
Description : T3 is (A) Thyroxine (B) Triodo thyronine (C) Triodo tyrosine (D) Reverse tri iodo thyronine
Last Answer : Answer : B
Description : The following are true about the thyroid hormone a. iodide ions enter the follicle cells by passive diffusion b .T4 and T3 bind to the receptors in nuclei c. thyroxine, once ... thyroglobulin until released d. a greater proportion of tri-iodothyronine is formed when iodine is deficient
Last Answer : T4 and T3 bind to the receptors in nuclei
Description : The following are true: a. thyroxine is formed by iodination of tyrosine b. the ratio of T3 :T4 secreted by the thyroid gland is 1:5 c. about 99.5% of thyroxines is protein bound d. T3 is more active than T4
Last Answer : T3 is more active than T4
Description : Thyroid hormones are present in blood (A) In free form (B) In association with thyroxine binding globulin (TBG) (C) In association with thyroxine binding prealbumin (TBPA) (D) Mainly in association with TBG, partly in free form and sometimes in association with TBPA also
Description : An enzyme required for the synthesis of thyroid hormones is (A) Iodinase (B) Deiodinase (C) Thyroperoxidase (D) Thyroxine synthetase
Last Answer : Answer : C
Description : The thymus gland produces a hormone called – (1) thyroxine (2) thymosin (3) thyronine (4) calcitonin
Last Answer : (2) thymosin Explanation: The thymus is a specialized primary lymphoid organ of the immune system. Thymosin hormones are typically produced by the thymus gland and trigger the creation of Tcells, which are used by the immune system to fight disease. The thymus gland is only active until puberty.
Description : The thymus gland produces a hormone called (1) thyroxine (2) thymosin (3) thyronine (4) calcitonin
Last Answer : thymosin
Description : Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom. Endocrine Hormone Function/ gland Deficiency symptoms (a) ... child birth (d) Posterior Growth Oversecretion pituitary hormone stimulates (GH) abnormal growth
Last Answer : (a) Thyroid Thyroxine Lack of iodine gland in diet results in goitre
Description : The aim of iodine therapy before subtotal thyroidectomy in Grave’s disease is: A. To render the patient euthyroid B. To restore the iodine content of the thyroid gland C. To inhibit peripheral conversion of thyroxine into triiodothyronine D. To reduce friability and vascularity of the thyroid gland
Last Answer : D. To reduce friability and vascularity of the thyroid gland
Description : The following thyroid inhibitor interferes with peripheral conversion of thyroxine to triiodothyronine: A. Propyl thiouracil B. Methimazole C. Carbimazole D. Radioactive iodine
Last Answer : A. Propyl thiouracil
Description : Which one of the following hormones contains iodine? (1) Thyroxine (2) Testosterone (3) Insulin (4) Adrenaline
Last Answer : (1) Thyroxine Explanation: Thyroxine is produced by attaching iodine atoms to the ring structures of this protein's tyrosine residues; thyroxine (T4) contains four iodine atoms
Last Answer : (1) Thyroxine Explanation: Thyroxine is produced by attaching iodine atoms to the ring structures of this protein's tyrosine residues; thyroxine (T4) contains four iodine atoms, while triiodothyronine (T3), otherwise identical to T4, has one less iodine atom per molecule.
Description : Which is NOT a correct association of tissues and hormones or functions? A) adipose tissue--leptin to regulate a feeling of fullness B) thymus--use of iodine to make thyroxine for ... insulin for regulation of blood glucose levels E) pancreas--glucagon for regulation of blood glucose levels
Last Answer : B) thymus--use of iodine to make thyroxine for regulation of body growth
Description : Protein bound iodine in blood is present to the extent of _______ / dL (A) 3–8 mg (B) 4–8 mg (C) 3–8 gm (D) 4–8 gm
Last Answer : Answer : A
Description : The only correct statement about hormone receptors is (A) Receptors for protein hormones are present in cytosol (B) Receptors for steroid hormones are membrane bound (C) Hormone-receptor binding is irreversible (D) Receptors can undergo down regulation and up regulatoin
Description : Which micromineral is essential for the production of the thyroid hormones? a. calcium c. fluorine b. iodine d. magnesium
Last Answer : b. iodine
Description : Iodine is required in human body for (A) Formation of thyroxine (B) Formation of Glutathione (C) Formation of potassium iodide (D) Adrenalin
Description : Thyroperoxidase iodinates (A) Free tyrosine in thyroid gland (B) Tyrosine residues of thyroglobulin (C) Tyrosine residues of thyroxine binding globulin (D) Tyrosine residues of thyroxine binding prealbumin
Description : Which one of the following hormones is derived most completely from tyrosine? (A) Glucagon (B) Thyroxine (C) Insulin (D) Prostaglandins
Description : Iodo-acetate inhibits enzyme by reacting with which group at the active site of the enzyme?
Last Answer : Sulfhydryl group.
Description : The most abundant thyroid hormone in blood is (A) Free T3 (B) T3 bound to TBG (C) Free T4 (D) T4 bound to TBG
Description : All the following statements about TSH are true except (A) It is a tropic hormone (B) It acts on para-follicular cells of thyroid glands (C) Its receptors are membrane-bound (D) Its second messenger is cyclic AMP
Description : riiodothyronine differs from thyroxine in that: A. It is more avidly bound to plasma proteins B. It has a shorter plasma half life C. It is less potent D. It has a longer latency of action
Last Answer : B. It has a shorter plasma half life
Description : 17.2 Triiodothyronine differs from thyroxine in that: A. It is more avidly bound to plasma proteins B. It has a shorter plasma half life C. It is less potent D. It has a longer latency of action (
Description : Radioactive iodine uptake by thyroid gland is increased in (A) Endemic goitre (B) Hyperthyroidism (C) Myxoedema (D) Creatinism
Description : Radioactive iodine uptake by thyroid gland 24 hours of a test dose is (A) 1.5–15% of the test done (B) 15–20% of the test done (C) 20–40% of the test done (D) 50–70% of the test done
Description : Thyroid gland takes up circulating iodine (A) By simple diffusion (B) By facilitated diffusion (C) By active uptake (D) In exchange for chloride
Description : All the following statements about endemic goiter are true except (A) It occurs in areas where soil and water have low iodine content (B) It leads to enlargement of thyroid gland (C) It results ultimately in hyperthyroidism (D) It can be prevented by consumption of iodised salt
Description : Iodine content of thyroid gland in an adult is about (A) 1–3 mg (B) 4–8 mg (C) 10–15 mg (D) 25–30 mg
Description : Iodine is stored in (A) Thyroid gland as thyroglobulin (B) Liver (C) Intestine (D) Skin
Description : Addition of a trace of thyroxine or iodine in water containing tadpoles will (a) keep them in larval stage (b) hasten their metamorphosis (c) slow down their metamorphosis (d) kill the tadpoles.
Last Answer : (b) hasten their metamorphosis
Description : Match the source gland with its respective hormone and function and select the correct option. Source Hormone Function gland (a) Anterior Oxytocin Contraction of uterus pituitary muscles during ... (c) Corpus Estrogen Supports pregnancy luteum (d) Thyroid Thyroxine Regulates blood calcium level
Last Answer : (b) Posterior Vasopressin Stimulates pituitary reabsorption of water in the distal tubules in the nephron
Description : Choose the correct statement about carbimazole: A. It induces improvement in thyrotoxic symptoms afer 1-4 weeks therapy B. Control of thyrotoxic symptoms with carbimazole is accompanied by ... leads to thyroid escape' D. It mitigates thyrotoxic symptoms without lowering serum thyroxine levels
Last Answer : A. It induces improvement in thyrotoxic symptoms afer 1-4 weeks therap
Description : ntithyroid drugs exert the following action: A. Inhibit thyroxine synthesis B. Block the action of thyroxine on pituitary C. Block the action of TSH on thyroid D. Block the action of thyroxine on peripheral tissues
Last Answer : A. Inhibit thyroxine synthesis
Description : Antithyroid drugs exert the following action: A. Inhibit thyroxine synthesis B. Block the action of thyroxine on pituitary C. Block the action of TSH on thyroid D. Block the action of thyroxine on peripheral tissues
Last Answer : . Inhibit thyroxine synthesis
Description : Triiodothyronine is preferred over thyroxine in the treatment of: A. Endemic goiter B. Cretinism C. Papillary carcinoma of thyroid D. Myxoedema coma
Last Answer : D. Myxoedema coma
Description : Thyroxine therapy is indicated in the following conditions except: A. Euthyroid status with raised TSH level B. Diffuse nontoxic goiter C. Nonfunctional thyroid nodule D. Benign functioning thyroid nodule
Last Answer : C. Nonfunctional thyroid nodule
Description : Insulin like growth hormones are produced by (A) Hypophysis (B) Liver (C) Pancreas (D) Thyroid
Description : Secretion of thyroid hormones is regulated by (A) Hypothalamus (B) Anterior pituitary (C) Feedback regulation (D) All of these 220 MCQs IN BIOCHEMISTRY
Description : Receptors for thyroid hormones are present (A) On the cell membrane (B) Across the cell membrane (C) Inside the cells (D) In association with G-proteins
Description : Thyroid hormones are synthesized by the iodination of the amino acid: (A) Glycine (B) Phenylalanine (C) Alanine (D) Tyrosine
Description : Excess secretion of thyroid hormones causes (A) Hyperthyroidism (B) Myxoedema (C) Cretinism (D) Cushing syndrome
Description : DOPA is an intermediate in the synthesis of (A) Thyroid hormones (B) Catecholamines (C) Melanin (D) Catecholamines and melanin
Description : All the following statements about phenylketonuria are correct except (A) Phenylalanine cannot be converted into tyrosine (B) Urinary excretion of phenylpyruvate and phenyllactate is increased (C) It ... diet (D) It leads to decreased synthesis of thyroid hormones, catecholamines and melanin
Description : Tryptophan could be considered as precursor of (A) Melanotonin (B) Thyroid hormones (C) Melanin (D) Epinephrine
Description : Binding of thyroxine to its receptors (A) Activates Adenylate cyclase (B) Activates guanylate cyclase (C) Activates a stimulatory G-protein (D) Increases transcription
Description : The followings are steroid hormones: a. corticotrophic hormone (ACTH) b. aldosterone c. thyroxine d. growth hormone
Last Answer : aldosterone
Description : Hormones thyroxine, adrenaline and the pigment melanin are formed from (a) tyrosine (b) proline (c) tryptophan (d) glycine.
Last Answer : (a) tyrosine
Description : Which one of the following pairs of hormones are the examples of those that can easily pass through the cell membrane of the target cell and bind to a receptor inside it (mostly in the nucleus)? (a) Insulin, glucagon (b) Thyroxine, insulin (c) Somatostatin, oxytocin (d) Cortisol, testosterone
Last Answer : (d) Cortisol, testosterone