1. Free tubulin subunits in the cytosolic pool bind to: e. ATP 2. Discussing the

ID: 199399 • Letter: 1

Question

1. Free tubulin subunits in the cytosolic pool bind to:

e. ATP

2. Discussing the PDGF membrane receptor tyrosine kinases: which of the following statements is correct?

a. they do not have intracellular kinase domains but are physically associated with tyrosine kinases

b. activated receptors can directly bind to GAP to regulate Ras activity

c. activated receptors can directly bind to Ras to regulate Ras activity

d. they trans-autophosphorylate each other on all tyrosine residues upon ligand binding

e. activated receptors can directly bind to SOS protein to regulate Ras activity

3. Which of the following proteins cross-link AF to form contractile bundles?

a. GTP

1. GDP bound actin remains freely in cytoplasm. Option C is correct.

2.PDGFs receptors trans auto phosphorylate each other at tyrosine residue to tranmitt the signals. Option d is correct.

3. alpha-actin proteins are involved in contractile bundles nad control cell activity and motality. Option d is correct.

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