SI worksheet 15 answers - a b previously c d Itiscommont

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SI worksheet 15 – The immune system  Which of the following is a characteristic of adaptive immunity? a. It is found only in invertebrates. b. Responses are the same whether or not the pathogen has been encountered  previously. c. Responses are active immediately upon infection. d. It is common to all animals. e. It has the ability to detect very specific pathogens. Phagocytosis is best defined as _____. a. the cellular ingestion and digestion of foreign substances b. the process by which a cell engulfs and takes up a liquid c. the secretion of antimicrobial peptides d. the fusion of an intracellular vesicle with the plasma membrane of a cell e. the process of activating memory T cells Chemicals produced by virus-infected cells that alert neighboring cells to prepare a  defense are called _____. a. antibodies b. interferons c. cytokines d. antigens e. complement proteins If microorganisms penetrate the innate defenses, an inflammatory response may be  initiated by the _____. a. accumulation of phagocytes in an injured area b. release of interferon by infected cells c. increased blood flow to an infected or injured area d. discharge of cytokines from neutrophils e. release of chemicals such as histamine by mast cells The antigen-binding sites of an antibody molecule are formed from the molecule's  variable regions. Why are these regions called variable? a. They can change their shapes to fit different antigens.
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