1. Inserting bone marrow cells into an individual who produces abnormalerythrocytes is an example of what type of therapy? A. Somatic cell B. Germ cell C. Genetic engineering D. Recombinant DNA: Answer A Gene therapy can be applied in two ways.The less controversial approach issomaticcell therapy, which consists of inserting normal genes into the cells of an individual whohas a genetic disease.In this approach, a particulartissue,such as bone marrow cellsthatproduce abnormal erythrocytes, is treated. 2. 2. DNA replication requires the enzyme DNA polymerase to: A. Travel along the single DNA strand, adding the correct nucleotide to the newstrand B. Move along the double strand of DNA to unwind the nucleotides of thedouble helix C. Hold the double strand apart while the correct nucleotides are added to thestrand D. Transport the double strand of DNA from the nucleus to the cytoplasm forprotein formation: Answer A The DNA polymerase enzyme travels along the single DNA strand, adding thecorrect nucleotides to the free end of the new strand (see Figure 4-2, B). 3. 3. Transcription is best defined as a process by which: A. DNA polymerase binds to the promoter site on ribonucleic acid (RNA). B. RNA directs the synthesis of polypeptides for protein synthesis. C. RNA is synthesized from a DNA template. D. A base pair substitution results in a mutation of the amino acid sequence.- Answer C Transcription is the process by which RNA is synthesized from a DNA template.