3、Which of the following is not the difference between prokaryotes and eukaryotes? （12.5分）
(A) presence of membrane
(B) size of ribosome
(C) size of cells
(D) presence of nucleus（正确答案）
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4、Which of the following is the role of the cytoskeleton? （12.5分）
(A) cytoplasmic streaming （正确答案）
(B) pumps out excess water
(C) absorbs light energy and synthesizes sugar
(D) separates the contents of the nucleus from the cytoplasm
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5、Which of the following is not the function of the proteins in the plasma? （12.5分）
(A) transfer ATP to ADP
(B) attachment to the cytoskeleton and extracellular matrix （正确答案）
(C) release hormones in the blood to reach target organs or structure
(D) make water flow out of the cell（正确答案）
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6. Transport proteins use energy (ATP) to transport materials across the membrane. Na-K pump, uses ATP to maintain higher concentrations of Na and K on opposite sides of the plasma membrane. What is the name of this protein?
（12.5分）
(A) Carrier protein
(B) Recognization protein
(C) Transport protein （正确答案）
(D) Adhesion protein
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7、What does the cell carry out when it has sustained too much genetic damage that could lead to cancer? (12.5分）