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【判断题】
当星体死亡时,它的热核燃料已被燃烧耗尽。()A.
正确
B.
错误
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举一反三
【简答题】严禁将印章带出机关或者在空白介绍信上加盖印章。在印章使用中发生问题,按"___________、_____________" 的原则追究责任,严肃处理。
【单选题】Sugar Power for Cell Phones Using enzymes commonly found in living cells, a new type of fuel cell produces small amounts of electricity from sugar. If the technology is able to succeed in mass product...
A.
When enzymes can be commonly found in living cells.
B.
When the technology of producing a new type of fuel cell appears.
C.
When the technology of a new type of fuel cell is suitable for mass production.
D.
When the technology of mass producing cell phones appears.
【简答题】影响混凝土和易性的因素有哪些?
【单选题】I bought a new type of cell-phone, which was the ____ of all my classmates.
A.
wish
B.
respect
C.
envy
D.
admire
【简答题】完形填空: Electricity-Generating Tinted Windows Reveal a Sustainable Future Researchers have developed a new type of tinted "smart window" that generates electricity when darkened. The windows "can be __1...
【多选题】The cancer cell may have acquired, from exogenous sources, completely new DNA sequences, notably those of viruses such as _______________________________________, each of which is known to contribute ...
A.
human papilloma virus, Epstein Barr virus
B.
hepatitis B virus
C.
human T lymphotropic virus 1
D.
human herpes virus 8
【多选题】How do actin-binding proteins influence the type of protrusions formed at the leading edge of the cell?
A.
The formation and growth of actin filaments at the leading edge of a cell are assisted by various actin-binding proteins. The actin-related proteins (ARPs) promote the formation of a web of branched actin filaments in lamellipodia.
B.
ARPs form complexes that bind to the sides of existing actin filaments and nucleate the formation of new filaments, which grow out at an angle to produce side branches. With the aid of additional actin-binding proteins, this web undergoes continual assembly at the leading edge and disassembly further back, pushing the lamellipodium forward.
C.
The other kind of cell protrusion, the filopodium, depends on formin, a nucleating protein that attaches to the growing plus ends of actin filaments and promotes the addition of new monomers to form straight, unbranched filaments.
D.
Formins are also used elsewhere to assemble unbranched filaments, such as in the contractile ring that pinches a dividing animal cell in two.
【单选题】I bought a new type of cell-phone, which was the ___________ of all my classmate.
A.
admire
B.
wish
C.
respect
D.
envy
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