【单选题】A new study indicates that basic steps taken by people daily can go a long way in ____ the greenhouse gas emission.
【多选题】The basic pathway for repairing damage to DNA involves three basic steps:
A.
Step 1: excision: the damaged DNA is recognized and removed by one of a variety of mechanisms. These involve nucleases, which cleave the covalent bonds that join the damaged nucleotides to the rest of the DNA strand, leaving a small gap on one strand of the DNA double helix in the region.
B.
Step 2: resynthesis: a repair DNA polymerase binds to the 3ʹ-hydroxyl end of the cut DNA strand. It then fills in the gap by making a complementary copy of the information stored in the undamaged strand.
C.
Step 3: ligation: when the repair DNA polymerase has filled in the gap, a break remains in the sugar–phosphate backbone of the repaired strand. This nick in the helix is sealed by DNA ligase, the same enzyme that joins the Okazaki fragments during replication of the lagging DNA strand.
【单选题】下列是评价日常生活活动能力的常用工具的是
【单选题】The basic steps to make an effective presentation
A.
Prepare, introduce, organization, delivery, end, exchange, conclusion and summary
B.
Prepare,Speech, organization, delivery, end, exchange, conclusion and summary
【简答题】零件有上、下、左、右、前、后六个方位,在主视图上只能反映零件的 方位,俯视图上只能反映零件的 方位。
【单选题】2001年1月6日,A将《2001年春节联欢晚会》VCD简装版光盘独家复制、发行权授予B,后B在市场上发现《2001年春节联欢晚会》VCD光盘数套,套封上署名为C,系D制作。B认为A作为(2001年春节联欢晚会》的邻接权人,享有就其电视节目《2001年春节联欢晚会》的广播、电视组织者邻接权,而其经A授权享有独占的电视录像制品复制、发行权等邻接权,故以D侵犯“录像制作者权纠纷”为由提起诉讼,D辩称其...