Free notes, MCQs, tables & flowcharts for FMGE Biochemistry
What is the main component of a bilayer cell membrane?
ACholesterol ester
BTriacyl glycerol
CCholesterol
DPhospholipids
Which of the following statements best describes the mechanism of action of insulin on target cells?
AInsulin binds to a receptor on the outer surface of the plasma membrane, activating adenylate cyclase through the Gs protein.
BInsulin binds to a cytoplasmic receptor and is transferred as a hormone receptor complex to the nucleus to modulate gene expression.
CInsulin enters the cell and causes the release of calcium ions from intracellular stores.
DInsulin binds to a transmembrane receptor on the outer surface of the plasma membrane, activating the tyrosine kinase in the cytosolic domain of the receptor.
In the electron micrograph, the arrow indicates small, membrane-bound, electron-dense granules clustered near the plasma membrane of a secretory cell. These granules store products before their release by exocytosis. What are they?
AGolgi cisternae
BMitochondria
CRough endoplasmic reticulum
DSecretory vesicles
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