Which of the following statements about the complement system is false?
1.Complement proteins circulate in the bloodstream in the form of inactive precursors.
2.Binding of complement proteins to bacteria results in a cascade reaction in which complement proteins activate each other.
3.Complement proteins associate together into membrane attack complexes which create pores in membranes of bacteria.
4.Complement proteins may bind to antibodies.
5.Complement proteins are encoded by a set of genes called the major histocompatibility complex.
Question 2Which of the following choices best describes therapeutic cloning?
1.The nucleus from a somatic cell is transferred into an enucleated egg, which divides in culture, forming an inner cell mass of embryonic stem cells.
2.A human gene is inserted into a retrovirus and transferred into a patient's white blood cells to correct a disorder.
3.Totipotent cells from early embryos are propagated in culture and transferred into patients to treat disease.
4.Germ cells of individuals with genetic disorders are targeted for gene transfer to repair the mutated gene.
Quick Reply
