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.
Name the structure marked with an arrow
ASecretory vesicles
BMitochondria
CRough Endoplasmic reticulum
DGolgi bodies
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