It can be inferred from the passage that ________. A: there will inevitably be a heated debate over the general application of the recombinant DNA technology B: the use of recombinant DNA technology on human beings will be forbidden C: recombinant DNA technology can be traced back to hundreds of years ago D: serious dilemmas may be created when recombinant DNA technology is used to modify human ge- netic codes

In recombinant DNA technology a plasmid vector is cleaved by

重组抗原疫苗（recombinant antigen vaccine）

In recombinant DNA technology a plasmid vector is cleaved by</p></p>

When the frequency of recombinant between two genes is 0, the relationship of these two genes is complete non-linkage.

Linked genes always exhibit A: phenotypes that are similar B: recombination frequencies of less than 50% C: homozygosity when involved in a testcross D: a greater number of recombinant offspring than parental offspring when involved in a testcross E: a lack of recombinant offspring when a heterozygous parent is involved in a testcross

4. When the frequency of recombinant between two genes is between 0 and 1, the relationship of these two genes is incomplete linkage.

Q8-Which of the following proposals are true? A: 1- The new viral recombinant vaccine expressing antigen 85A is efficient in human clinical trials B: 2- Several vaccine candidates based on MVA (Modified Virus Ankara) are protective in human clinical trials C: 3- The recombinant MVA vaccine expressing antigen 85A is protective in pre-clinical tests

GM foods are made from crops whose make-up has been genetically changed by recombinant DNA or gene splicing. </p></p>

4. When the frequency of recombinant between two genes is between 0 and 1, the relationship of these two genes is incomplete linkage. A: 正确 B: 错误