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What is the role of bacteria as decomposers?
To break down the nutrients in dead matter and the atmosphere.
How do archaebacteria differ from eubacteria?
Lack peptidoglycan in cell walls, have different membrane lipids, and the DNA sequences of key archaebacterial genes are more like those of eukaryotes than those of eubacteria.
How can bacteria be helpful to living things?
Producers that capture energy by photosynthesis, while others are decomposers that break down the nutrients in dead matter and the atmosphere.
Characteristics of bacteria?
Prokaryotic cell type, cell walls with peptidoglycan, unicellular and can be autotrophic or heterotrophic.
Organism that can capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds
When a bacterium has grown so that is has doubled in size, replicates DNA, and divides in half.
When a hollow bridge forms between two bacterial cells, and genes move from one cell to another.
When growth conditions become unfavorable and bacterium form spores, which germinate and begin to grow.
Why are viruses not considered living?
Not made up of cells, have no cell parts, do not grow and develop, and do not respond to their environment.
Attachment to cell, Penetration (injection) of viral DNA or RNA, Replication (Biosynthesis) of new viral proteins and nucleic acids, Assembly (Maturation) of the new viruses, Release of the new viruses into the environment (cell lyses).
Phage DNA is injected into the host cell, Viral DNA joins the host DNA forming a prophage, when an activation signal occurs, the phage DNA starts replicating, Viral DNA may stay inactive in host cell for long periods of time, Replicated during each binary fission, over time, many cells form containing the prophages.
What do both a living cell and a virus have in common?
Viruses Reproduce, evolve and mutate, and have limited movement.
How does HIV increase the danger of secondary infections?
Ability to become dormant inside the cell, called latent or lysogenic viruses.
Lysogenic (Latent) Viruses
Remain inactive for long periods of time, later activating to produce new viruses in response to some external signal.
Discipline of classifying organisms and assigning each organism a universally accepted name.
Classification system in which each species is assigned a two-part scientific name.
Why are scientific names used instead of common names?
Accurately and uniformly name organisms, prevent misnomers, and use the same language for all names.
Eukaryote, Cell Walls of cellulose in some; some have chloroplasts, most unicellular; some colonial, some multicellular, Auto/Hetero.
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