Please help Place the following steps in order to outline how enzymes are involved with proofreading newly formed DNA molecules.

DNA polymerase does not detect damaged DNA.

Exonuclease cuts the damaged DNA strand in order to remove the damaged section.

Ligase connects the free end of the new DNA with the old DNA.

DNA polymerase replaces the damaged DNA with the correct nucleotide.

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

Which of the follow describes a disadvantage secondary sources have compared to primary sources?

Which of the following is required of a new drug?me