Chapter 21

3. Unicellular organism that lacks a nucleus.
4. Protein coat surrounding a virus.
6. Preparation of weakened or killed pathogens used to produce immunity to a disease.
8. Structure produced by prokaryotes in unfavorable conditions; a thick internal wall that encloses the DNA and a portion of the cytoplasm.
9. A group of drugs used to block the growth and reproduction of bacterial pathogens.
10. Particle made of proteins, nucleic acids, and sometimes lipids that can replicate only by infecting living cells.
11. Kind of virus that infects bacteria.
14. Process in which some prokaryotes exchange genetic information.

1. Bacteriophage DNA that is embedded in the bacterial host’s DNA.
2. infection Type of infection in which a virus embeds its DNA into the DNA of the host cell and is replicated along with the host cell’s DNA.
5. infection Type of infection in which a virus enters a cell, makes copies of itself, and causes the cell to burst.
7. RNA virus that contains RNA as its genetic information.
12. Disease causing agents?
13. fission Type of asexual reproduction in which an organism replicates its DNA and divides in half, producing two identical daughter cells.