Steroid hormones are synthesised from (A) Cholesterol (B) 7-Dehydrocholesterol (C) Calcitriol (D) 7-Hydroxycholesterol

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Answer :

Answer :  A

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Description : Calcitriol inhibits the conversion of (A) Cholesterol into 7-dehydrocholesterol (B) Cholecalciferol into 1-hydroxycholecalciferol (C) Cholecalciferol into 25-hydroxycholecalciferol (D) 25-Hydroxycholecalciferol into 1,25- dihydroxycholecalciferol

Last Answer : Answer : D

Description : Parathormone is required for the conversion of (A) Cholecalciferol into 1-hydroxycholecalciferol (B) Cholecalciferol into 25-hydroxycholecalciferol (C) 25-Hydroxycholecalciferol into calcitriol (D) Cholesterol into 7-dehydrocholesterol

Last Answer : Answer : C

Description : cis-acting elements include (A) Steroid hormones (B) Calcitriol (C) Histones (D) Silencers

Last Answer : Answer : D

Description : Steroid hormones are synthesised in all of the following except (A) Testes (B) Ovaries (C) Adrenal medulla (D) Adrenal cortex

Last Answer : Answer : A

Description : Steroid hormones are synthesized from (A) Adenine (B) Protein (C) Vitamin (D) Cholesterol

Last Answer : Answer : D

Description : All mammalian steroid hormones are formed from (A) Purine (B) Pyrimidine (C) Cholesterol (D) Pyrrole

Last Answer : Answer : C

Description : Acetyl CoA formed from pyruvate can be used for the synthesis of all the following except (A) Glucose (B) Fatty acids (C) Cholesterol (D) Steroid hormones

Last Answer : Answer : A

Description : A metabolite which is common to pathways of cholesterol biosynthesis from acetyl-CoA and cholecalciferol formation from cholesterol is (A) Zymosterol (B) Lumisterol (C) Ergosterol (D) 7 Dehydrocholesterol

Last Answer : Answer : D

Description : This interferes with cholesterol absorption (A) Lipoprotein lipase (B) Creatinase (C) 7-dehydrocholesterol (D) β-sitosterol

Last Answer : Answer : D

Description : Which of the following statements are not incorrect `:-` (i) Liver, the largest gland in our body secretes cholesterol, degrade steroid hormones, vita

Last Answer : Which of the following statements are not incorrect `:-` (i) Liver, the largest gland in our body secretes ... I,ii,iv C. I only D. I,ii,iv

Description : A common intermediate in the synthesis of all the steroid hormones is (A) Pregnenolone (B) 17-Hydroxypregnenolone (C) Corticosterone (D) Progesterone

Last Answer : Answer : A

Description : All the following statements about steroid hormones are true except (A) They are hydrophobic (B) They require carriers to transport them in circulation (C) Their receptors are intracellular (D) They require cyclic AMP as second messenger

Last Answer : Answer : D

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

Last Answer : Answer : D

Description : A provitamin D synthesized in human beings is (A) Ergosterol (B) 7-Dehydrocholesterol (C) Cholecalciferol (D) 25-Hydroxycholecalciferol

Last Answer : Answer : B

Description : Provitamin D3 is (A) Cholecalciferol (B) Ergosterol (C) 7-Dehydrocholesterol (D) Ergocaliferol

Last Answer : Answer : C

Description : The β-ring of 7-dehydrocholesterol is cleaved to form cholecalciferol by (A) Infrared light (B) Dim light (C) Ultraviolet irridation with sunlight (D) Light of the tube lights

Last Answer : Answer : C

Description : The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Last Answer : Answer : B

Description : The structure shown below is of (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Ergocalciferol (D) 7-Dehydrocholesterol

Last Answer : Answer : A

Description : The cholesterol molecule is (A) Benzene derivative (B) Quinoline derivative (C) Steroid (D) Straight chain acid

Last Answer : Answer : C

Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid

Last Answer : C

Description : Which one of the following hormones thought synthesised elsewhere, is stored and released by the master gland ?

Last Answer : Which one of the following hormones thought synthesised elsewhere, is stored and released by ... hormone C. Luteinizing hormone D. Prolactin

Description : Phytohormones are (a) chemical regulating flowering (b) chemical regulating secondary growth (c) hormones regulating growth from seed to adulthood (d) regulators synthesised by plants and influencing physiological processes.

Last Answer : (d) regulators synthesised by plants and influencing physiological processes.

Description : Estrogen and testosterone are steroid hormones, and most likely bind to

Last Answer : Estrogen and testosterone are steroid hormones, and most likely bind to A. Cytoplasmic receptors ... receptors D. G-protein liked membrane receptors

Description : Steroid hormones easily pass through plasma membrane by simple diffusions because by

Last Answer : Steroid hormones easily pass through plasma membrane by simple diffusions because by A. Are lipid- ... through pores D. Contains carbon and hydrogen

Description : Steroid hormones

Last Answer : Steroid hormones A. have only cell surface receptors B. are lipophobic C. act through altering the ... cell D. are produced by only adrenal cortex

Description : Most hormone receptors are localized on the cell membrane and transduce hormone binding into altered levels of intracellular messengers. A limited number of intracellular receptors do exist. Which of ... protein serves as an inhibitor protein blocking the DNA-binding domain of the steroid receptor

Last Answer : Answer: a, d Although most hormone and other messenger receptors are extracellular, intracellular receptors have been identified. The hormone messengers involved for these receptors are primarily ... DNA-binding domain of the receptor. Activation involves the dissociation of the inhibitor protein

Description : Which of the following hormones is a steroid? (1) Estrogen (2) Glucagon (3) Insulin (4) Oxytocin

Last Answer : (1) Estrogen Explanation: Steroid hormone is produced by three endocrine organs. The testes, produces testosterone; the ovaries, produces estrogen; and the adrenal cortex, produces steroid hormones such as cortisol and aldosterone.

Description : Contraceptive pills in the market contain – (1) steroid-hormones (2) inorganic compounds (3) herbicides (4) antibiotics

Last Answer : (1) steroid-hormones Explanation: Contraceptive, pill: Commonly called "the pill," combined oral contraceptives are the most commonly used form of reversible birth control in the United States.

Description : Which of the following hormones is a steroid? (1) Estrogen (2) Glucagon (3) Insulin (4) Oxytocin

Last Answer : (1) Estrogen Explanation: Steroid hormone is produced by three endocrine organs. The testes, produces testosterone; the ovaries, produces estrogen; and the adrenal cortex, produces steroid hormones such as cortisol and aldosterone.

Description : The followings are steroid hormones: a. corticotrophic hormone (ACTH) b. aldosterone c. thyroxine d. growth hormone

Last Answer : aldosterone

Description : With regard to membrane receptors for hormones: a. they are often glycoproteins b. they are important for hormones made up of steroid c. those for insulin exhibit an intrinsic protein kinase activity d. glucagon uses calcium as a second messenger

Last Answer : they are often glycoproteins

Description : Which statement is NOT true about non-steroid (peptide) hormones? A) They are derived from peptides, proteins, polypeptides, and derivatives of amino acids. B) They bind to receptors on the cell surface. ... They create an enzyme cascade effect. E) They enter the cell in order to have an effect.

Last Answer : E) They enter the cell in order to have an effect.

Description : Which statement is NOT true about steroid hormones? A) They include hormones such as estrogen. B) They do not bind to cell surface receptors. C) The hormone-receptor complex can enter the ... complex can bind to chromatin. E) Steroid hormones act faster than non-steroid (peptide) hormones.

Last Answer : E) Steroid hormones act faster than non-steroid (peptide) hormones.

Description : Which statement about hormone types is correct? A) Non-steroid hormones activate an enzyme cascade. B) Steroid hormones regulate the production of a particular protein. C) Non-steroid hormones are ... all have four carbon rings with different side chains. E) All of the choices are correct.

Last Answer : E) All of the choices are correct.

Description : Contraceptive pills in the market contain (1) Inorganic compounds (2) Herbicides (3) Antibiotics (4) Steroid-hormones

Last Answer : Steroid-hormones

Description : Women become susceptible to osteoporosis after menopause due to decreased (A) Secretion of Parathormone (B) Conversion of vitamin D into calcitriol (C) Secretion of estrogen (D) Secretion of progesterone

Last Answer : Answer : C

Description : Hormone that bind to cell surface receptor and require the second messenger camp is (A) Antidiuretic hormone (B) Cholecystokinin (C) Calcitriol (D) Gastrin

Last Answer : Answer : A

Description : Calcitriol facilitates calcium absorption by increasing the synthesis of the following in intestinal mucosa: (A) Calcium Binding Protein (B) Alkaline Phosphatase (C) Calcium-dependent ATPase (D) All of these

Last Answer : Answer : D

Description : Calcitriol is (A) 1-hydroxy cholecalciferol (B) 25-hydroxy cholecalciferol (C) 24, 25-dihydroxy cholecalciferol (D) 1, 25-dihydroxy cholecalciferol

Last Answer : Answer : D

Description : Calcitriol is (A) 1-OH-cholecalciferol (B) 25-OH-cholecalciferol (C) 24, 25-diOH cholecalciferol (D) 1, 25-diOH cholecalciferol

Last Answer : Answer : D

Description : Tubular reabsorption of calcium is increased by (A) Cholecalciferol (B) 25-Hydroxycholecalciferol (C) Calcitriol (D) All of these

Last Answer : Answer : C

Description : Calcitriol synthesis involves (A) Both liver and kidney (B) Intestine (C) Adipose tissue (D) Muscle

Last Answer : Answer : A

Description : The most potent Vitamin D metabolite is (A) 25-Hydroxycholecalciferol (B) 1,25-Dihydroxycholecalciferol (C) 24, 25-Dihydroxycholecalciferol (D) 7-Dehydrocholesterol

Last Answer : (B) 1,25-Dihydroxycholecalciferol

Description : Triglycerides which are solids or semisolids at room temperature are called __________. (a) oil (b) fat (c) steroid (d) cholesterol

Last Answer : fat

Description : Which of the following statement is correct about membrane cholesterol? (A) The hydroxyl group is located near the centre of the lipid layer (B) Most of the cholesterol is in the form ... forms a rigid, planar Structure (D) The hydrocarbon chain of cholesterol projects into the extracellular fluid

Last Answer : (C) The steroid nucleus form forms a rigid, planar Structure

Description : Cholesterol, bile salts, vitamin D and sex hormones are (A) Mucolipids (B) Glycolipids (C) Phospholipids (D) Isoprenoid lipids

Last Answer : Answer : D

Description : The precursor of bile salts, sex hormones and vitamin D is (A) Diosgenin (B) Cholesterol (C) Campesterol (D) Ergosterol

Last Answer : Answer : B

Description : Characteristics of Vitamin D and its metabolites include which one of the following? (a) Act to decrease serum levels of calcium (b) Activation of their Vitamin D receptors increases cellular CAMP ... Vitamin D increase renal excretion of calcium (e) Vitamin D deficiency results in Pager's disease

Last Answer : Ans: C

Description : The most suitable vitamin D preparation for vitamin D dependent rickets is: A. Calciferol B. Cholecalciferol C. Calcifediol D. Calcitriol

Last Answer : D. Calcitriol

Description : 6.2 Which hormone acts through a cytoplasmic receptor: A. Calcitriol B. Prolactin C. Vasopressin D. None of the abov

Last Answer : A.Calcitol binds to cytoplasmic membrane and enhances the absorption of Calcium by increasing the calcium binding proteins-calbindin-D proteins.