Flashcards in Introduction to Bacteria Deck (21)
What are the different parts of a bacterium?
-Cytoplasm with ribosomes
Describe the cell wall of gram positive bacteria.
Describe the cell wall of gram negative bacteria.
-Outer membrane (lipopolysaccharide and protein)
What colour do gram positive bacteria stain?
What colour do gram negative bacteria stain?
What shape are cocci?
What shape are bacilli?
What does the capsule do?
Can protect the bacteria from being engulfed
What is the function of flagellum?
What are the 4 types of flagellum?
-A: Monotrichous: 1
-B: Lophotrichous: 1 point
-C: Amphitichous: both sides
-D: Peritrichous: all over
What is the function of fimbriae?
What do spores enhance?
What are plasmids
Small circular DNA molecule
What is the name of the mechanism which transfers plasmids?
The rolling circle mechanism
How do bacteria replicate?
Through binary fission which ensures identical progeny
How is genetic variation ensured?
Through spontaneous mutation and transfer of DNA
What are the 3 ways in which DNA can be transferred?
How can individual bacteria be seen?
Under microscope using stain
How can colonies of individual bacteria be detected?
-Cultures on solid medium
-Bacterial colonies can be seen by eyes
What inhibits the growth of gram positive bacteria?