1.which of the following has genetic engineering been used to do? a) make plants easier to grow in low gravity b) make plants more resistant to pesticides & herbicides c) make plants more resistant to frost & drought d) make plants more resistant to disease e) make plants more nutritious for human consumption 2. genetically identical organisms derived from a single genetic source are called a. hybrids b. clones c. siblings d. variants

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 is the correct term for an area of rotating currents in an ocean? when ocean currents combine, they create an area of rotating currents called an

19. a cell is viewed under a microscope and is found to have two nuclear envelopes and spindles that appear to be breaking apart. which phase of mitosis is the cell most likely in? a. metaphase b. prophase c. telophase d. anaphase