The earliest discovery of human beings and the most common chromosomal disease in clinic, is the following:

Several chromosomal loci _____ in tumorigenesis of pancreatic endocrine tumors (PET) have been identified.

中国大学MOOC: A bacterial cell transfers chromosomal genes to F-cells, but it rarely causes them to become F+. The bacterial cell is:

Cordocentesis (Percutaneous Umbilical Cord Blood Sampling, PUBS) does not help identify ( ). A: chromosomal irregularities B: fetal anemia C: infections D: neural tube defects

A bacterial cell transfers chromosomal genes to F- cells, but it rarely causes them to become F+. The bacterial cell is: A: Hfr. B: lysogenic. C: Auxotrophic. D: lytic.

Which of the following cannot be studied by tissue culture?() A: Effects of drugs on cells B: Canceration of cells C: Replication of human disease models D: Chromosomal variation E: Virus replication

Indications of PGT include ( ) A: Patients with abnormal chromosome number or structure B: Patients with a history of chromosomal abnormalities in their offspring C: Advanced aged patients D: Patients with cancer susceptibility genes

E coli DNA polymerase III: A: can initiate replication without a primer. B: is efficient at nick translation. C: is the principal DNA polymerase in chromosomal DNA replication. D: represents over 90% of the DNA polymerase activity in E: requires a free 5'-hydroxyl group as a primer.