Identify the purpose of each of the following steps in the photosynthesis experiment. Hole-punching the leaves

Adding bicarbonate buffer to the syringe.

Exposing the disks to a vacuum in the
syringe

Adding a plain buffer to the syringe

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.

Penelope studies how the structure and function of the nervous system is related to behavior. she is a psychologist

Is dna the same in every cell in the human body explain your answer