Which of the following is a good primer sequence for PCR?
A: A 25-bp oligonucleotide with a Tm of 56 degree
B: A 30-bp oligonucleotide which can form a hair-pin structure
C: A 50-bp oligonucleotide with a Tm of 55 degree
D: A 30-bp oligonucleotide with a Tm of 72 degree
A: A 25-bp oligonucleotide with a Tm of 56 degree
B: A 30-bp oligonucleotide which can form a hair-pin structure
C: A 50-bp oligonucleotide with a Tm of 55 degree
D: A 30-bp oligonucleotide with a Tm of 72 degree
举一反三
- Which of the following is correct about the gene chip? A: It can simultaneously analyze the variation of multiple genes. B: Microarray sample density is very small. C: It can be used to study the expression of multiple genes. D: It is a regularly arranged cDNA or oligonucleotide array.
- Which of the following are the two dimensions of environmental uncertainty? A: degree of change and degree of complexity B: degree of change and degree of volume C: degree of complexity and degree of impact D: degree of impact and degree of timing
- Which of the following indices can represent the degree of collaboration 未知类型：{'options': ['', '', '', ''], 'type': 102}
- 血容量不足 。 A: CVP↓BP↓ B: CVP↓BP正常 C: CVP↑BP↓ D: CVP↑ BP正常 E: CVP正常 BP↑
- 下列哪项属于高血压Ⅲ级 A: BP≥130／85mmHg B: BP≥140／90mmHg C: BP≥180／110mmHg D: BP≥160／100mmHg E: BP≥170／105mmHg