【单选题】下列关于真核生物、原核生物和病毒的叙述中,有几项正确的( ) 1 葡萄球菌、青霉菌、破伤风杆菌都属于原核生物 2 硝化细菌、酵母菌、蓝藻都含有核糖体和 DNA 3 烟草花叶病毒的遗传物质彻底水解将得到 3 种物质 4 有些细菌的遗传物质是 RNA
【简答题】I ________ your house, so I thought I' d stop by for a chat. [A] pass [B]had passed [C]have passed [D] was passing
【简答题】细菌的遗传物质有______、______。
【单选题】As Prof. Hoffmann describes, the first World War was controversial even________. It is known for being a very, very nasty war where lots of lives were lost and soldiers died of disease and fighting in...