Activated cytotoxict cells (t lymphocytes) flag cells for destruction by macrophages differentiate into plasma cells that secrete antibodies bind to antigens that are presented by special proteins that occur on membranes of eukaryotic cells flag cells for destruction by megakaryocytes attack foreign cells directly by binding to an antigen-bearing cell, secreting proteins that perforate the foreign cell's membrane, and signaling the cell to undergo apoptosis.

Whats one way that rocks do not follow the typical rock cycle pathway?

Will give ! ! widentify the advantages and disadvantages of renewable and nonrenewable energy resources.

During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.