Which one of the following enzymes is responsible for the convers

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 Multiple Choice QuestionsMultiple Choice Questions

111.

Which of the following statement is correct in relation to the endocrine system?

  • Adenohypophysis is under direct neural regulation of the hypothalamus

  • Organs in the body like gastrointestinal tract, heart, kidney and liver do not produce any hormones

  • Non- nutrient chemicals produced by the body in trace amount that act as intercellular messenger are known as hormones

  • Releasing and inhibitory hormones are produced by the pituitary gland


112.

Select the answer which correctly matches the endocrine gland with the hormone it secretes and its function/deficiency symptom

  • Endocrine gland Hormone Function/ deficiency symptoms
    Anterior pituitary Oxytocin Stimulates uterus contraction during child birth
  • Posterior pituitary Growth Hormone (GH) Oversecretion stimulates abnormal growth
  • Thyroid gland Thyroxine Lack of iodine in diet results in goitre
  • Corpus luteum Testosterone Stimulates spermatogenesis

113.

Which of the following pituitary hormones is secreted without the involvement of a Releasing Hormone (RH)?

  • Thyroid Stimulating Hormone (TSH)

  • Follicle Stimulating Hormone (FSH)

  • Oxytocin

  • Prolactin


114.

Which of the following hormones is a derivative of fatty acid?

  • Gastrin

  • Thyroxin

  • Estrogen

  • Prostaglandins


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115.

Cells die at the time of release of secretory materials in

  • holocrine gland

  • apocrine gland

  • merocrine gland

  • mixed or apocrine gland


116.

Melatonin is produced from

  • pineal gland

  • adrenal gland

  • parathyroid gland

  • ovary


117.

Zymogenic cells of gastric gland secrete

  • pepsinogen

  • trypsin

  • pepsin

  • chymotrypsin


118.

Which one of the following is called intra-specific chemical messenger?

  • Pheromones

  • Prostaglandins

  • Corticotrophin

  • Catecholamines


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119.

Which one of the following secretes glucagon?

  • Beta (β) cells of islets of Langerhans

  • Alpha (α) cells of islets of Langerhans

  • Acidophilic cells of adenohypophysis

  • Basophilic cells of adenohypophysis


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120.

Which one of the following enzymes is responsible for the conversion of norepinephrine to epinephrine?

  • Catecholamine-O-methyltransferase

  • Phenylalanine-N-methyltransferase

  • DOPA decarboxylase

  • Monoamine oxidase


A.

Catecholamine-O-methyltransferase

Phenylalanine-N-methyltransferase (PNMT) is an enzyme found in the adrenal medulla that converts nor-epinephrine to epinephrine. It is a protein whose encoding gene is found on chromosome 17 in humans. It catalyses the transfer of a methyl group from SAM (S-adenosyl-L-methionine) which is a factor to nor-epinephrine, converting it into epinephrine.


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