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Flashcards in Morphology And Structure Deck (52)
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1

Size of bacteria

Diameter 0.2-2.0 nanometers
Length 2-8 nanometers

2

Bacteria measured by

Ocular micrometer

3

Cocci

In cluster, pairs, chains or packets

4

Bacilli

Pairs, chains, palisade, rosette

5

Spirilla

Individual cells with variation in length and spirals

6

Flagella originate in----- and protrude through the ........

Made of .....

Cytoplasmic membrane

Cell wall

Flagellin protein

7

Flagellation is more commonly found on

Baciili

8

Monotrichous

On flagella on either end of the bacterium

9

Lophotrichous

Bundle of flagella on either end of the bacterium

10

Amphitrichous

Flagella on both ends of the bacterium

11

Peritrichouse

Flagella around the bacterium

12

Flagella are detected by

Flagella stain directly
Observable motility in wet mounts and hanging drops

13

True motility

Direction and purposeful movement

14

Pili (fimbrae) are composed of..... and originate in.....and protrude....

Protein
Cytoplasmic membrane
Cell wall

15

Pili found on

Gram negative bacteria mostly

16

Pili are observable on

Electron microscope

17

Pili are present on both .... bacteria

Motile and no motile

18

Function of pili

Allows for attachment and adherence,

Used in conjugation

19

Capsule or slime layer function

Viscous covering of polysaccharides or protein used for protection

20

Sheath

Tubule enclosing individuals bacteria and are aligned End to end

21

Stalk

Semi rigid appendages often with adhesive substance at distal end found in some inhabitants of fresh water

22

Cell wall

Gives shape and is essential for growth and division

All bacteria have them except for mycoplasms

23

Cell wall protects against

Osmotic lysis

24

Gram negative have outer membrane composed of

Lipopolysaccharides, phospholipids and lipoproteins

25

Gram positive bacteria have

Teichoic acid in cell wall

26

Difference in flagella basal body in gram positive and negative

Positive - 2 rings in basal body
Negative - four rings

27

Only structure of motility in bacteria

Flagella

28

Why is a gram stain able to differentiate between gram positive and negative bacteria?

When alcohol is placed on gram positive bacteria, the crystal violet, iodine complex is retained because it cannot pass through the multiple layers of peptidoglycan. However, when alcohol is placed on a gram negative bacterium, lipids are extracted from the outer membrane and the crystal violet iodine complex passes through the thin layer of peptidoglycan.

29

Treating bacteria with enzyme lysozyme

Removes cell wall creating a protoplast. It will stain gram negative even if it is positive because it cannot hold stain

30

Endospores are characterized by

LOCATION and size