单选题一个信使RNA含鸟嘌呤15％、胞嘧啶25％，则作为模板的原DNA分子中含胸腺嘧啶为（）A15％B25％C30％D60％
单选题
一个信使RNA含鸟嘌呤15％、胞嘧啶25％，则作为模板的原DNA分子中含胸腺嘧啶为（）
A
15％
B
25％
C
30％
D
60％
参考解析
解析：
暂无解析
相关考题：
单选题设a，b是两个非零向量，则下面说法正确的是（ ）。A若｜a＋b｜＝｜a｜－｜b｜，则a⊥bB若a⊥b，则｜a＋b｜＝｜a｜－｜b｜C若｜a＋b｜＝｜a｜－｜b｜，则存在实数λ，使得a＝λbD若存在实数λ，使得a＝λb，则｜a＋b｜＝｜a｜－｜b｜
问答题案例二：请批改下面这篇作文，要求改正文中的错别字，改正划横线的病句并指出病因，至少写3条眉批，在文后写出评语。评语要求能够简明、准确地概括本文主要的优缺点，并对学生今后的写作具有指导作用。我为妈妈做早餐 ①昨晚，妈妈一个人又挑灯夜战到“太阳钻出被窝”。早上我醒来，推开妈妈的房门，只见疲惫不堪的妈妈还在熟睡，睡得那么甜。一缕阳光从门缝里照射进来，照在妈妈安详的脸上，她蓬乱的头发间沾着零星的稻草屑。透过窗户看着场外堆得像小山似的稻子，我的心不禁一颤。这些天农忙，爸爸又不在家，家中里里外外都是妈妈一个人在撑着，真不容易呀！看着这样的妈妈，我真想为她做点什么。 ②做什么好呢？一是我厨艺有限，二是时间有限，在寻找“可利用资源”的时后，碗柜里几个鸡蛋的“俏影”让我一下子计上心来，我给妈妈煎荷包蛋吧，这是妈妈最爱吃的，也是我最拿手的。 ③我打开召气灶，把油放进平底锅，待油在锅里喧闹起来之后，便把鸡蛋在灶台上一磕，两手一扳，蛋清便“争先恐后”地涌进锅里，只见蛋黄在锅里“啪啪”地跳跃着，透明的蛋清像吹了气的泡泡糖，鼓出了一个个泡泡，周围的边微微卷起。渐渐地，软乎乎的蛋黄变硬了，我往上面均匀地撒一点盐，然后把鸡蛋翻个身，不一会，鸡蛋被油滋润得像一块黄宝石，又撒了一点盐，这样，外焦里嫩的鸡蛋就煎好了。 ④接着，我又照此方法连煎了三个鸡蛋。金灿灿、香喷喷的鸡蛋整齐地排列在碗里，我真想偷吃一口，哪怕是小小的一口，但是眼前马上出现了妈妈正弯着腰，满头大汗地在地里辛勤收割，挑灯夜战。想到此，我伸出舌头舔了舔嘴唇，使力咽下一大口口水，把冒着香气的鸡蛋轻轻地放在妈妈床边的柜子上。 ⑤我轻轻地掩上门，背着书包上学去了。窗外，当顶的阳光正明媚。
单选题How many homes altogether were damaged in the storm? _____.AFourteenBTwenty-oneCTwenty-nineDThirty-six
单选题When asking students to arrange the scrambled sentences into a logical paragraph, the teacher is focusing on __________.Areading skillsBcritical thinkCproofreading skillsDtextual coherence
单选题1912-1936年我国经济快速增长。与其相关的因素是()。①中华民国建立及实行促进经济发展的政策②“一战”期间欧洲列强放松对华资本和商品输出③南京国民政府开展“国民经济建设运动”④四大家族对民族工业的推动A①②③B①②④C①③④D②③④
单选题北宋真宗时期通行的铁钱“小钱每十贯重六十五斤……街市买卖至三五贯文，即难以携持”，益州16家富商联合发行交子。南宋绍兴三十年（1160年）“初命临安府印造会子，许于城内外与铜钱并行”“千里之远，数万之缗，一夫之力克日可到。”对该材料理解准确的是（）。A宋代纸币取代金属货币B会子成为了世界上最早发行的纸币C长途贩运贸易开始出现D纸币从信用凭证到官方法定的过程
单选题在PowerPoint2003中插入Flash动画时，可通过插入（）控件对象来完成。ALabelBTextBoxCShockwaver Flash objectDCommandButton
单选题一战后期，面对国际货币关系领域的自由放任与国际经济的发展要求，《经济学家》杂志指出：“迫切需要货币方面的国际协议。”此后建立了（）。A雅尔塔体系B北大西洋公约组织C欧洲共同体D布雷顿森林体系
单选题请阅读 Passage 1，完成第 21~25小题。Passage 1These days，many large city buildings are equipped with their own air-conditioning systems.These systems help keep the buildings cool，but they can also damage the environment.Since they use a lot of electricity，for instance，they contribute indirectly to global warming.In addition，the water that flows through the systems is often cooled using chemicals called chlorofluorocarbons，or CFCs，that are believed to damage the Earth's ozone layer.Recently，though，a system has been built in the city of Toronto，Canada，that cools buildings with little damage to the environment. In the traditional air-conditioning systems found in most large buildings，water is pumped through the building in a continuous cycle.The water is first cooled to a temperature of 4℃ in machines called chillers.It is then sent to individual units that cool the air in each room.As the water flows through the building，it gradually becomes warmer.Finally，it reaches the roof ，where it is left to cool down naturally in a water tower.After that it is returned to the chillers，where the cycle begins again.Toronto lies on the shore of Lake Ontario，one of North America's Great Lakes，and the new system makes use of cold water taken from about 80 meters below the surface of the lake.At this depth，the water in the lake remains at 4℃ all year round.This is exactly the temperature to which the water in air-conditioning systems is cooled.However，the water from the lake is not pumped directly into the air-conditioning systems.Instead，it is used to cool the water that is already inside the air-conditioning systems.After that，the lake water is added to the city's ordinary water supply.Enwave，the company that developed this deep-lake cooling system，says that it uses 75 percent less energy than traditional air conditioning.And since no CFCs are used，no damage can be caused to the ozone layer.Not every city is located next to a large lake，but experts believe that systems like the one being used in Toronto could be built elsewhere by using other natural sources of cold water.Which of the following is true?AEnwave's system is said to work only in cities located near the Great Lakes.BThe water deep in Lake Ontario always remains at the same temperature.CExperts warn that the use of CFCs in Enwave' s system will add to global warming.DToronto is now searching for new natural sources of water to use in its water supply.
单选题奥古斯都允许外出当兵的儿子，对他在服役期间取得的财物享有合法权利，如果该儿子在未立遗嘱的情况下死亡，其财产将转归其父。后来，这一原则也适用于在其他各种公共部门服务时获取的财物。此外，对不是来源于父亲的财产，同样也允许儿子享有一定程度的利益。材料说明在罗马帝国时期（）。A积极鼓励儿子离家外出当兵B父亲的利益是执法的唯一标准C父子关系是法律关注的核心D用法律来协调财产权的矛盾
单选题下列选项是四则"遗失启事"的主要内容，其中表达通顺、得体的一项是（）A本人昨日在体育馆遗失一副红色羽毛球拍，您若及时联系鄙人，不胜感激之至。B昨日本人不慎丢失《随想录》一书于阅览室，期盼拾得者璧还原物，谢谢哟。C本人昨日在图书馆不慎丢失黑框眼镜一副，希望拾到者与我联系，不胜感激。D昨日本人遗失饭卡于学校饮食服务中心，恳请拾者高抬贵手交还，万分感激。