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Which of the following macromolecules leaves the nucleus of a eukaryotic cell through pores in the nuclear membrane?

Examine the picture below:  What is the name of the purple membrane integral protein cell structure that is moving the yellow colored  positive ions out of the cell. 

Animal cells are permeable to water and urea but NOT to sucrose. Initially, the inside of a cell contains 1 M sucrose and 1 M urea and the outside 2 M sucrose and 1 M urea. After the system reaches equilibrium, what changes are observed?

Which of the following is NOT a function of membrane proteins?

The solutions in the two arms of this U-tube are separated by a membrane that is permeable to water and glucose but not to sucrose. Side A is half-filled with a solution of 2 M sucrose and 1 M glucose. Side B is half-filled with 1 M sucrose and 2 M glucose. Initially, the liquid levels on both sides are equal.Refer to the figure. After the system reaches equilibrium, what changes are observed?

Which of the following is NOT a function of membrane proteins?

Integrins are glycoproteins that help link the cytoskeleton and the:

Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of an adjacent cell through _____.

Integrins are glycoproteins that help link the cytoskeleton and the:

Diffusion _____.