Morphology Of Bacteria

Question 1

What are the types of bacteria

Answer 1

Cocci
Bacilli
Actinomycetes
Mycoplasmas
Rickettsiae and chlamydiae

Question 2

What shape are the cocci

Answer 2

Spherical or oval

Question 3

What are the 5 arrangements of cocci

Answer 3

Diplococci → pairs
Streptococci → chains
Staphylococci → clusters
Tetrads → groups of four
Sarcina → eight

Question 4

What is the shape of bacilli

Answer 4

Rod shaped

Question 5

What are types of bacilli

Answer 5

Cocco bacilli → length approximately same as width
Strepto bacilli → chains
Chinese letter or cuneiform pattern → arranged at angles to each other
Comma shaped → curved appearance
Spirilla → rigid spiral forms

Question 6

Example of cocco bacilli

Answer 6

Brucella

Question 7

Example of strepto bacilli

Answer 7

Strepto - bacillus

Question 8

Example of Chinese letter

Answer 8

Corynebacterium

Question 9

Example of comma - shaped

Answer 9

Vibrio

Question 10

Example of spirilla

Answer 10

Spirillum, spirochetes

Question 11

Explain the actinomycetes

Answer 11

These are branching filamentous bacteria resembling fungi
They have a rigid cell wall

Question 12

Explain mycoplasmas

Answer 12

Cell wall deficient so don’t possess a stable shape
Occur as Round or oval bodies and as interlacing filaments
Very small ( 50 - 300 nm in diameter )
Can reproduce in cell-free medium

Question 13

Explain rickettsiae and chlamydiae

Answer 13

Very small
Obligate parasites
Inability to grow outside living cells
Behaves like virus