Suppose a mutation arises in a population of sunflowers that results in xylem vessels twice as large in diameter as the wild-type vessels. These mutant xylem vessels will have water transport capacity, and will be susceptible to cavitation from freezing. higher; more higher; less lower; less lower; more

Based on the results of this study, what questions remain unanswered? how can these questions guide future research

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.

What controls activities within a eukaryotic cell?