Choose the one altenmauve that best completes the statement or answers the quest

Question

Choose the one altenmauve that best completes the statement or answers the question. 1) Which of these proteins has a role to activate MAPKinase cascade? A) Ran B) Rab C) Ras D) Rho 2) What type of cell junctions are found most in cardiac muscle tissue? A) Gap junction B) Tight junction C) Desmosome D) Occluding junction 3) Estradiol functions inside a cell by A) acting as a signal receptor that activates ion-channel proteins. B) becoming a second messenger that inhibits adenylyl cyclase. C) binding with a receptor protein that enters the nucleus and activates specific genes. D)acting as a steroid signal receptor that activates ion-channel proteins. What does a target cell require to respond to an extracellular signal 4) molecule? A) Access to the signal molecule B) The presence of an appropriate receptor for the signal molecule C) Appropriate intracellular signal pathways D) All of the above

Explanation / Answer

1) C. Ras.

2) C. desmosome.

3) C. binding with a receptor protein that enters the nucleus and activates specific genes.

4) D. All of the above.

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