Q.Vaccines that use components of a pathogenic organism rather than the whole organism are called a) Subunit recombinant vaccines b) attenuated recombinant vaccines c) DNA vaccines d) conventional vaccines

Step 1. Recall the chapter's own definition: 'vaccines that use components of a pathogenic organism rather than the whole organism are called subunit vaccines' — this is a near word-for-word match to the question. Step 2. Subunit recombinant vaccines are built from isolated components — proteins, peptides or DNA fragments of the pathogen — giving purity, stability and safety advantages over whole-organism preparations. Step 3. Rule out the distractors by contrast: attenuated recombinant vaccines use a whole pathogen (bacterium or virus) that has been genetically weakened, not just a component; DNA vaccines deliver a plasmid encoding an antigen gene, a distinct mechanism from a purified prote …

Match the question's definition almost verbatim to the chapter's own d …

• Confusing subunit vaccines (a component only) with attenuated vaccines (the whole pathogen, just weakened). …