Question

Which of the following does NOT occur when a receptor tyrosine kinase binds its ligand?

	a.	Activation of Ras.
	b.	Dimerization of the receptor.
	c.	Cross-phosphorylation of the receptor subunits.
	d.	Activation of heterotrimeric G proteins.

Which of the following is FALSE?

	a.	Cells use constitutive secretion to deliver new membrane with its integral membrane proteins to the surface of the cell (plasma membrane).
	b.	Archaeal DNA is located in the nucleus.
	c.	Serine-Threonine kinases phosphorylate (add a phosphate to) the amino acids serine and threonine.
	d.	Anterograde transport refers to movement inside a cell, away from the nucleus, and towards the periphery of the cell.

Answer 1

1.In Receptor tyrosine kinase pathway, when ligand binds to receptor, then cross posphorylation and dimerization of receptor occurs. Result in Ras protein became activated. But there is no connection between Receptor Tyrosine kinase pathway and heterotrimer G protein activation. Heterotrimeric G protein active only G Protein Couple Receptor (GPCR)pathway.so d is the answer

2. Statement b is the False. Archeal DNA located in cytoplasm not neuclus in fact archea do not have any true nucleus as seen in Eukaryotic cell.

All the other statements are true.