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What are the structure and function of intermediate filaments?A.
Intermediate filaments have great strength, and their main function is to enable cells to withstand the mechanical stress that occurs when cells are stretched. The filaments are called “intermediate” because, in the smooth muscle cells where they were first discovered, their diameter (about 10 nm) is between that of the thinner actin filaments and the thicker myosin filaments.
B.
Intermediate filaments are the toughest and most durable of the cytoskeletal filaments: when cells are treated with concentrated salt solutions and nonionic detergents, the intermediate filaments survive, while most of the rest of the cytoskeleton is destroyed.
C.
Intermediate filaments are found in the cytoplasm of most animal cells. They typically form a network throughout the cytoplasm, surrounding the nucleus and extending out to the cell periphery. There, they are often anchored to the plasma membrane at cell–cell junctions called desmosomes, where the plasma membrane is connected to that of another cell.
D.
Intermediate filaments are also found within the nucleus of animal cells. There, they form a meshwork called the nuclear lamina, which underlies and strengthens the nuclear envelope. In this section, we see how the structure and assembly of intermediate filaments makes them particularly suited to strengthening cells and protecting them from tearing.
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【单选题】下面关于柳永的说法,不正确的是哪一项( )
A.
柳永是北宋第一个专力作词的文人
B.
柳永创作了大量的慢词
C.
柳永的影响力主要是在俗词方面
D.
柳永词多写都市繁华和倚红偎翠的生活，尤擅表达羁旅行役之苦
【简答题】Studies have proved that insects do not ______.
【简答题】推动践行以爱国奉献、明礼遵规、勤劳善良、宽厚正直、自强自律为主要内容的个人品德,鼓励人们在日常生活中养成好品行 li zun gui zheng zhi lü yang cheng
【单选题】关于柳永，下列说法不正确的是（）。
A.
柳永的《定风波•自春来，惨绿愁红》是一首长调
B.
温庭筠的《菩萨蛮•小山重叠金明灭》是一首小令
C.
柳永的《定风波》和温庭筠的《菩萨蛮》都只是描写美女梳妆，都是淫靡之词，不能引起人任何联想。
D.
柳永的《定风波》中“终日恹恹倦梳裹”，意同温庭筠的《菩萨蛮》中的“懒起画蛾眉”，都描写的是思妇。
【单选题】What have past behavioral studies found about our brain?
A.
Its capacity actually knows no limits.
B.
It grows sophisticated with practice.
C.
It keeps our most precious memories until life’s end.
D.
New information learned pushes old information out.
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