Exam 3 Review

Which of the following matches the description of microtubule structures?

• Very stable coiled filaments that composed of non-polar fibrous proteins

• Polar hollow tubes formed by polymeryzation of tubulin dimers

• Smallest element composed of actin-binding proteins

• Composed of amphipathic molecules lined up to allow only certain molecules to pass

What are the motor protein(s) of microtubules?

• Actin

• Myosin

• Kinesin/Dynein

• N/A

What are the motor proteins of intermediate filaments?

• Actin

• Myosin

• Kinesin/Dynein

• N/A

Name three junctions talked about in class and their respective function.

What second messenger would Adenylyl Cyclase produce?

• IP₃

• cAMP

• Ca²⁺

• DAG

What do protein kinases do?

Name me one example of a ligand that would bind to a GPCR. Also, a ligand that would bind to an RTK.

Which component of the heterotrimeric G protein dissociates itself once it is GTP-bound?

• Beta (β)

• Gamma (γ)

• Alpha (α)

• Epsilon (ε)

Why are some hormones able to cross through the cell membrane and bind to a intracellular receptor, while others only bind to cell-surface receptors and cannot cross the membrane?

An endocrine cell is able to send its hormones anywhere in the body. What type of signaling method is this describing?

• Autocrine

• Paracrine

• Endocrine

• Neuronal

Tags

NGSS.HS-LS1-3