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Chemical Coordination and Integration

NEET (UG) 2019MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET (UG) 2019

How does steroid hormone influence the cellular activities?

  1. Activating cyclic AMP located on the cell membrane
  2. Using aquaporin channels as second messenger
  3. Changing the permeability of the cell membrane
  4. Binding to DNA and forming a gene-hormone complex

Answer

(4) Binding to DNA and forming a gene-hormone complex

Solution

Steroid hormones are lipid soluble, so they cross the cell membrane and bind to intracellular (nuclear) receptors.

⇒ As per NCERT, hormones which interact with intracellular receptors (e.g., steroid hormones, iodothyronines) mostly regulate gene expression or chromosome function by the interaction of the hormone-receptor complex with the genome.

∵ cAMP as second messenger is used by protein (membrane-receptor) hormones,

∴ steroid hormones act by binding to DNA and forming a gene-hormone complex.

Answer: (4)

Keep practising — Chemical Coordination and Integration

Ques. 2NEET (UG) 2019

Which of the following glucose transporters is insulin-dependent?

  1. GLUT III
  2. GLUT IV
  3. GLUT I
  4. GLUT II
Ques. 3NEET 2018

Which of the following is an amino acid derived hormone?

  1. Ecdysone
  2. Estriol
  3. Epinephrine
  4. Estradiol
Ques. 4NEET 2017

GnRH, a hypothalamic hormone, needed in reproduction, acts on

  1. anterior pituitary gland and stimulates secretion of LH and FSH
  2. posterior pituitary gland and stimulates secretion of oxytocin and FSH
  3. posterior pituitary gland and stimulates secretion of LH and relaxin
  4. anterior pituitary gland and stimulates secretion of LH and oxytocin.
Ques. 5NEET 2017

Hypersecretion of growth hormone in adults does not cause further increase in height, because

  1. epiphyseal plates close after adolescence
  2. bones lose their sensitivity to growth hormone in adults
  3. muscle fibres do not grow in size after birth
  4. growth hormone becomes inactive in adults.
Ques. 6NEET 2016 (Phase 1)

Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

  1. Aldosterone – Atrial Natriuretic Factor
  2. Relaxin – Inhibin
  3. Parathormone – Calcitonin
  4. Insulin – Glucagon
Ques. 7NEET 2016 (Phase 1)

The amino acid tryptophan is the precursor for the synthesis of

  1. estrogen and progesterone
  2. cortisol and cortisone
  3. melatonin and serotonin
  4. thyroxine and triiodothyronine.
Ques. 8NEET 2016 (Phase 2)

Graves' disease is caused due to

  1. hyposecretion of thyroid gland
  2. hypersecretion of thyroid gland
  3. hyposecretion of adrenal gland
  4. hypersecretion of adrenal gland.
Ques. 9NEET 2016 (Phase 2)

Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilisation.

  1. Insulin
  2. Glucagon
  3. Secretin
  4. Gastrin
Ques. 10NEET 2016 (Phase 2)

The posterior pituitary gland is not a 'true' endocrine gland because

  1. it is provided with a duct
  2. it only stores and releases hormones
  3. it is under the regulation of hypothalamus
  4. it secretes enzymes.
Ques. 11NEET 2016 (Phase 2)

Which hormones do stimulate the production of pancreatic juice and bicarbonate?

  1. Angiotensin and epinephrine
  2. Gastrin and insulin
  3. Cholecystokinin and secretin
  4. Insulin and glucagon
Out of syllabus

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