5. Which actin binding protein makes the tightest bundles such as in microvilli? (A) Alpha-actinin (B) Fimbrin (C) Filamin (D) Spectrin (E) Formin

15. What is a primary physiological role of aquaporins in plant cells? (A) They facilitate the transport of glucose across the cell membrane. (B) They transport ions to help establish and maintain electrochemical gradients. (C) They enable the rapid movement of water molecules across the membrane, essential for maintaining turgor pressure. (D) They are involved in the synthesis of ATP through proton gradients. (E) They facilitate the passive diffusion of amino acids necessary for protein synthesis in the cytoplasm.

5. Which actin binding protein makes the tightest bundles such as in microvilli?
(A) Alpha-actinin
(B) Fimbrin
(C) Filamin
(D) Spectrin
(E) Formin

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