【单选题】The first complete DNA sequence of a non-viral, free-living organism was obtained for:
【多选题】邓小平提出,在改革中我们必须始终坚持的根本原则是(,2002年)
【判断题】简单算术平均法主要适用于趋势型数据模式的预测对象。
【单选题】In the DNA sequence for sickle cell anaemia, adenine replaces thymine in a CTT triplet, forming the triplet CAT. During synthesis of the sickle cell haemoglobin molecule, the amino acid valine is inco...
【单选题】Some chemotherapeutic drugs alter the ability of DNA polymerase to faithfully replicate. For the DNA sequence 5 ′– ATCGATCGATCGATCG – 3 ′ , which one of the following represents the sequence and polar...
A.
5 ′– ATCTATCGATCGATCG – 3 ′
B.
3 ′– ATCGATCGATCGATCG – 5 ′
C.
5 ′– CGAUCGAUCAUCGAU – 3 ′
D.
5 ′– CGATCGATCGATCGAT – 3 ′
E.
3 ′– CGATCGATCGATCGAT – 5 ′
【单选题】For the DNA sequence , 5'—ATCGATCGATCGATCG—3' Which of the following represents the sequence and polarity of the complementary strand ?
A.
5'—ATCTATCGATCGATCG—3'
B.
3'—ATCGATCGATCGATCG—5'
D.
5'—CGATCGATCGATCGAT—3'
E.
3'—CGATCGATCGATCGAT—5'
【单选题】According to the article, what is one reason why scientists are mapping the sunflower DNA sequence?
A.
Because they want to work with experts at the Renewable Fuels Association
B.
Because they want to compare the sunflower genome with the human genome
C.
Because they want to crossbreed a sunflower with corn to create ethanol
D.
Because they want to locate genes responsible for agriculturally important traits
【简答题】(三选一)【选修5:有机化学基础】 有机化合物A→G的转化关系如图所示。 已知以下信息: ①F的分子式为C 7 H 8 O,且与FeCl 3 溶液不显色。 ②链烃A有两种化学环境不同的氢,1molA完全燃烧消耗6mol氧气。 ③B为溴代烃,其相对分子质量在130~140之间。 请回答下列问题: (1)A的结构简式是_________.A中官能团的名称是________。 (2)写出C转化为D的化学...