Test: Mechanism of hormone action
Category: Biology
Description: This test targets the students preparing for the medical entrances. The questions are related to the topics: Classification of hormones and mechanism of hormone action.
Keywords: steroid, peptide, second mesenger, hormone receptor complex, hormone
Receptors for water-soluble hormones are found on the _____________ of target cells, while receptors for lipid-soluble hormones are found in the ________ or________ of cells.
Plasma membrane, cytoplasm, nucleus
Nucleus, extracellular fluid, plasma membrane
Nucleus, cytoplasm, plasma membrane
None of the above are correct
Target cells tend to ______ _______ the number of their receptors when there are sustained high levels of hormone present.
Down regulate
Up regulate
Both
None
Dopamine, epinephrine, and norepinephrine are collectively referred to as the ______________.
Peptide hormones
Prostacyclins
Catecholamines
Steroid hormones
Which type of hormone is PTH (parathyroid hormone?
peptide
catecholamine
steroid
Biogenic amine
Which of the following hormone is derived from cholesterol?
Epinephrine
Thyroxine
Estrogen
Insulin
Hormones can stimulate any cell in the body.
True
False
The secretion of a nonpolar hormone is regulated by __________.
A steroid
Tropic hormone which is usually a peptide
Prostacyclins
None of the above
The steps of the cAMP second messenger system in the correct chronological sequence are: 1.G-protein binds to adenylate cyclase which converts ATP into cAMP. 2. Activated protein kinases elicit the cell response. 3. Hormone binds with Receptor. 4. cAMP phosphorylates protein kinases. 5. Receptor changes shape and activates G-protein.
1,5,4,3,2
3,5,1,4,2
2,5,4,1,3
4,3,5,2,1
Which type of hormone is 1,25(OH)2D (the active form of vitamin D)?
peptide
catecholamine
Biogenic amine
steroid
Where in the cell are peptide hormones synthesized?
Golgi apparatus
Rough endoplasmic reticulum
Nucleus
Plasma membrane
Endocrine glands secrete their products into _____.
Blood
Extracellular fluid
ducts
both A and B
Name the prohormone from which ACTH and alpha-MSH are produced.
pro-opiomelanocortin (POMC)
Halodrol
Superdrol
None of the above
Peptide hormones stimulate protein synthesis.
True
False
Which hormone binds to an intracellular receptor?
dopamine
Insulin
thyroid hormone
ACTH
Prostaglandins are synthesized from
Aminoacids
Carbohydrates
Fatty acids
Cholesterol
Comments
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