Full Definition of DRAG. 1. : something used to drag with; especially: a device for dragging under water to detect or obtain objects. 2. : something that is dragged, pulled, or drawn along or over a surface: as a: harrow b: a sledge for conveying heavy bodies c: conveyance.3. drag. noun \Ëdrag\. Tweet. : someone or something that is boring, annoying, or disappointing. : someone or something that makes action or progress slower or more difficult. : the act of breathing in smoke from a cigarette, cigar, pipe, etc.
Briefly describe the difference between the lytic cycle of virulent phages and the lysogenic cycle of temperate phages. Virulent phages reproduce strictly by the lytic cycle and ultimately result in the death of the host bacterial cell. During the lytic cycle, a virus injects its genome into the host cell.The genome directs production and assembly of new viral particles. A viral enzyme is produced and breaks open the cell, releasing new viral particles into the environment.Temperature phages can utilize either the lytic or lysogenic cycle. The infection cycle begins when a viral particle injects its genome into the host cell.n the lysogenic cycle, the viral genome integrates into the host chromosome as a prophage. The inactive prophage can remain part of the bacterial chromosome for an extended period and is replicated along with the bacterial chromosome prior to cell division.
host cell but remain hidden for years. Even though the viral nucleic acid becomes part of the host cellâs chromosome, it does not seem to affect the functions of the cell. At some point, however, the viral nucleic acid becomes active. It separates itself from the host cellâs genetic material, takes over the functions of the cell to produce new viruses, and destroys the host cell as the new viruses are released. This type of viral reproduction is called a lysogenic (li suh JE nihk) cycle. The steps of a lysogenic cycle are also shown in Figure 7.4. Figure 7.4 In a lytic cycle (red arrows), the virus uses the host cellâs organelles to make new viruses. In a lysogenic cycle (blue arrows), the virus âhidesâ in the host cellâs chromosome until it becomes active and uses the host cellâs organelles to reproduce. Release Assembly Bacteriophage Entry The bacteriophage injects its nucleic acid into the bacterial cell. New virus particles are assembled. Replication The hostâs metabolic machinery makes viral nucleic acid and proteins ...