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18 Cards in this Set
- Front
- Back
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why are viruses considered nonliving by some and living by others?
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living because it needs a host to be living and it can reproduce, but not living because it lacks the characteristics of life
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two parts of virus
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protein coat (capsid) and nucleic acid
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what part makes up most of the virus?
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capsid
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what part gives the virus its shape
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capsid
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four ways to classify viruses
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shape (spherical/rod-like)
who they infect (living organisms) generic material (what infection they cause) how they reproduce (active or latent) |
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virus reproduction (active virus)
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attach - finds host cell and attaches; protein coat allows it to attach
invade - injects hereditary material copy- make new copies (reproduce) Release - cell bursts open and releases viruses; host cell dies |
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what makes a latent virus different?
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invades but hereditary material becomes part of the host cell’s (stays in until active)
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examples of active viruses
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common cold, flu
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example of latent viruses
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aids, cold sores
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viral diseases
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polio, small pox, chicken pox
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how are viruses useful?
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gene therapy - virus serves as “messangers” injects “good” hereditary material
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best cure for unknown viral disease
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bed rest
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why are bacteria considered living
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has all the chemicals of life
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parts of bacteria
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ribosomes, cell wall, cell membrane, genetic material/DNA, cytoplasm, flagella (some have it(can move) some don’t (can’t move)
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binary fission
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(asexual) 1 parent required, divides into 2
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conjugation
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(sexual) 2 bacterial cells trading genetic material (transfer DNA) they then move on and divide on own, looking different then both parents
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best environments for bacteria to reproduce
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warm, moist, dark
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how are bacteria helpful
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food, oxygen, medicine, recycle (decomposer)
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