Introduction to Bacteria Flashcards Preview

Principles of Disease > Introduction to Bacteria > Flashcards

Flashcards in Introduction to Bacteria Deck (21):
1

What are the different parts of a bacterium?

-Capsule
-Cell wall
-Flagellum
-Fimbriae
-Cytoplasmic/inner/plasma membrane
-Cytoplasm with ribosomes
-Single chromosome

2

Describe the cell wall of gram positive bacteria.

Inside out:
-Plasma membrane
-Periplasmic space
-Thick peptidoglycan

3

Describe the cell wall of gram negative bacteria.

Inside out:
-Plasma membrane
-Periplasmic space
-Thin peptidoglycan
-Periplasmic space
-Outer membrane (lipopolysaccharide and protein)

4

What colour do gram positive bacteria stain?

Purple

5

What colour do gram negative bacteria stain?

Red

6

What shape are cocci?

Spherical

7

What shape are bacilli?

Rod shaped

8

What does the capsule do?

Can protect the bacteria from being engulfed

9

What is the function of flagellum?

Motility

10

What are the 4 types of flagellum?

-A: Monotrichous: 1
-B: Lophotrichous: 1 point
-C: Amphitichous: both sides
-D: Peritrichous: all over

11

What is the function of fimbriae?

Adherence

12

What do spores enhance?

Survivability

13

What are plasmids

Small circular DNA molecule

14

What is the name of the mechanism which transfers plasmids?

The rolling circle mechanism

15

How do bacteria replicate?

Through binary fission which ensures identical progeny

16

How is genetic variation ensured?

Through spontaneous mutation and transfer of DNA

17

What are the 3 ways in which DNA can be transferred?

-Conjugation
-Transformation
-Transduction

18

How can individual bacteria be seen?

Under microscope using stain

19

How can colonies of individual bacteria be detected?

-Cultures on solid medium
-Bacterial colonies can be seen by eyes

20

What inhibits the growth of gram positive bacteria?

Crystal violet

21

How are bacteria named?

Based on their genus and species