Chapter 17 Flashcards Preview

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Flashcards in Chapter 17 Deck (22)
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1
Q

filaments

A

threads

2
Q

motile

A

capable of independent movement

3
Q

flagella

A

whip-like tails that often occur in pairs

4
Q

Genetic recombination is often facilitated by

A

pilli, or minute tubes

5
Q

Eukaryotic cells

A
  • Have a nuclear envelope
  • Have 2 to hundreds of chromosomes per cell; DNA is double stranded
  • have membrane bound organelles
  • Have 80S ribosomes
  • Have asexual reproduction by mitosis
  • Have sexual reproduction by fusion
6
Q

Prokaryotic cells

A
  • Lack a nuclear envelope
  • Have a single, closed loop of double stranded DNA plus (usually) several to 40 plasmids
  • Lack membrane bound organelles
  • Have 70S ribosomes
  • Have asexual reproduction by fission
  • Sexual reproduction unknown
7
Q

conjugation

A

a plasmid and/or part of the DNA strand is transferred from a donor cell to a recipient cell usually through a tiny, hollow tubelike pilus.

8
Q

transformation

A

a living cell acquires fragments of DNA released by dead cells into the medium in which It occurs and incorporates them into its own cell

9
Q

transduction

A

fragments of DNA are carried from one cell to another by viruses

10
Q

Cocci (singular: coccus)

A

spherical (sometimes elliptical) shaped bacteria

11
Q

Bacilli (singular: bacillus)

A

rod shaped or cylindrical

12
Q

spirilla (singular: spirillum)

A

helix or spiral shaped

13
Q

gram positive

A

purple

14
Q

gram negative

A

pink

15
Q

heterotrophic

A

organisms that cannot synthesize their own food and therefore depend on other organisms for it

16
Q

autotrophic

A

capable of synthesizing organic compounds from simple inorganic substances

17
Q

chemoautotrophic

A

capable of obtaining the energy they require from various compounds or elements through chemical reactions

18
Q

compost

A

a dark fluffy material that enriches soil. Is made of organic decomposing substances

19
Q

Modes of access of disease bacteria

A
  • air
  • contamination of food or drink
  • direct contact
  • wounds
  • insect bites and other organisms
20
Q

Koch’s Postulates (definition)

A

rules for proving that a particular organism is the cause for a particular disease

21
Q

Koch’s Postulates (4 parts)

A
  1. the microorganism must be present in all cases of the disease
  2. the microorganism must be isolated from the victim in pure culture
  3. When the microorganism from the pure culture is injected into a susceptible host organism, it must produce the disease in the host
  4. the microorganism must be isolated from the experimentally infected host and grown in pure culture for comparison with that of the original culture
22
Q

bioremediation

A

the study of the use of living organisms in the cleanup of toxic wastes and pollution