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单选题 Most differentiated animal cells are polarized; that is, one end of the cell is structurally or functionally different from the other. Cells specialized for secretion have their _________________ positioned toward the site of secretion
学科：Cell Biology 《细胞生物学》一 专业基础课（全英教学）
时间：2023-05-23 06:49:35
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题目1单选题
Kinesins and dyneins are microtubule-associated motor proteins that use the energy of ________ hydrolysis to move unidirectionally along microtubulesA. GTPB. GDPC. ATPD. ADP
题目2单选题
The cytoskeleton is an intricate network of ________ filaments that extends throughout the cytoplasmA. DNAB. sugarC. lipidD. protein
题目3单选题
________________ are helical polymers of the protein actin. They are flexible structures, with a diameter of about 7 nm, that are organized into a variety of linear bundles, two-dimensional networks, and 3D gels. Although actin filaments are dispersed throughout the cell, they are most highly concentrated in the cortex, the layer of cytoplasm just beneath the plasma membraneA. Actin filamentsB. Intermediate filamentsC. Long filamentsD. Microtubules
题目4单选题
_______________ are hollow cylinders made of the protein tubulin. They are long and straight and typically have one end attached to a single microtubule-organizing center called a centrosomeA. Actin filamentsB. Intermediate filamentsC. Long filamentsD. Microtubules
题目5单选题
_________ binds tightly to free tubulin dimers and prevents their polymerization into microtubules, the mitotic spindle rapidly disappears, and the cell stalls in the middle of mitosis, unable to partition the chromosomes into two groupsA. CyclophosphamideB. ColchicineC. DoxorubicinD. Paclitaxel (Taxol)
题目6单选题
_________ binds tightly to microtubules and prevents them from losing subunits. Because new subunits can still be added, the microtubules can grow but cannot shrinkA. Imatinib (Gleevec)B. ColchicineC. Paclitaxel (Taxol)D. Irinotecan
题目7单选题
Which of the following drug binds and stabilizes microtubulesA. taxotere (docetaxel)B. colchicineC. vinblastineD. vincristine
题目8单选题
The cell's polarity is a reflection of the polarized systems of _____________ in its interior, which help to position organelles in their required location within the cell and to guide the streams of vesicular and macromolecular traffic moving between one part of the cell and anotherA. actin filamentsB. intermediate filamentsC. microtubulesD. myosin filaments
题目9单选题
When a cell has differentiated into a specialized cell type, the dynamic instability of its microtubules is often ___________ by proteins that bind to the ends or the sides of the microtubules and protect them against disassembly. The stabilized microtubules then serve to maintain the organization of the differentiated cellA. augmentedB. balancedC. suppressedD. promoted
题目10单选题
Most differentiated animal cells are polarized; that is, one end of the cell is structurally or functionally different from the other. Cells specialized for secretion have their _________________ positioned toward the site of secretionA. endoplasmic reticulum (ER)B. Golgi apparatusC. mitochondriaD. endosomes
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