Which of the following is not a steroid hormone? [2024]
Cortisol
Testosterone
Progesterone
Glucagon
(4)
Cortisol, testosterone, estradiol and progesterone are steroid hormones whereas glucagon is a peptide hormone.
How does steroid hormone influence the cellular activities? [2019]
Using aquaporin channels ‘as second messenger’
Changing the permeability of the cell membrane
Binding to DNA and forming a gene-hormone complex
Activating cyclic AMP located on the cell membrane
(3)
Steroid hormones are lipid-soluble and easily pass through the cell membrane of a target cell into the cytoplasm where they bind to specific intracellular receptors (proteins) to form a hormone receptor complex that enters the nucleus. In the nucleus, hormone which interact with intracellular receptors mostly regulate gene expression or chromosome function by the interaction of hormone-receptor complex with the genome. Biochemical actions result in physiological and developmental effects.
Identify A, B and C in the diagrammatic representation of the mechanism of hormone action. [2019]
Select the correct option from the following:
A - Steroid Hormone; B - Hormone-receptor Complex; C - Protein
A - Protein Hormone; B - Receptor; C - Cyclic AMP
A - Steroid Hormone; B - Receptor; C - Second Messenger
A - Protein Hormone; B - Cyclic AMP; C - Hormone-receptor Complex
Which of the following is an amino acid derived hormone? [2018]
Epinephrine
Ecdysone
Estradiol
Estriol
(1)
Epinephrine which triggers the flight or fight response is derived from amino acid tyrosine. It is synthesised in the medulla of the adrenal glands.
The amino acid tryptophan is the precursor for the synthesis of [2016]
estrogen and progesterone
cortisol and cortisone
melatonin and serotonin
thyroxine and triiodothyronine
(3)
Tryptophan is an essential amino acid which is precursor for the synthesis of melatonin and serotonin.
