Bacteria Morphology

Question 1

Gram positive stains??

Answer 1

Blue

Question 2

Gram negative stains

Answer 2

Pink

Question 3

Peptidoglycan is made out of

Answer 3

Disaccharide bound to amino acid

These amino acids binds to other disaccharide forming a cross linkage

Question 4

The enzymes that causes the formation of cross linkage between bacterial cell wall( peptidoglycan) is

Answer 4

Transpeptidase

Question 5

Penicillin is an anti cell wall drugs by

Answer 5

Inhibiting transpeptidase
Which cause the binding of peptidoglycan

Question 6

Selective toxicity of Amphotericin polymyxin and imidazole on bacteria membrane is through

How

Answer 6

Bacteria membrane does not have a sterol unlike fungi and human

So bacterial lack sterol on their plasma membrane

Question 7

What is the identification factor on gram positive bacteria membrane

Answer 7

Techoic acid

Question 8

Difference between gram positive and gram negative

Answer 8

Gram positive.

Antibiotics,dyes and detergent that harm bacteria cell wall and membrane can pass through

Does not have periplasmic space

Has techoic acid on cell wall for identification

GRAM NEGATIVE

has murin lipoprotein on cell wal
Has periplasmic space

Detergent dyes and antibiotics used for killing bacteria cell wall cannot pass through

Question 9

How many gram positive bacteria are there in human

Answer 9

7 types are gram positive
The rest are gram negative

Question 10

Classify the 7 gram positive

Answer 10

there are 3 circle. And 4 rods

3 circles are
Streptococcus
And enterococcus ( both form strips of circle)

And staphylococcus

4 rods are of two types
Spore forming

Bacillius and clostridium

Non spore forming
Listeria And corynebacterium

Question 11

Odd one out

Bacillus
Enterococcus
Listeria
Clostridium

Answer 11

Enterococcus is odd because it is the only gram positive bacteria that is circular in shape

Question 12

Odd one out

Enterococcus and streptococcus
Clostridium and bacillius
Bacillius and enterococcus
Staphylococcus and streptococcus
Listeria and corynebacterium

Answer 12

Bacillius is a spore forming rod shaped gram positive bacteria

Enterococcus is a strip circular gram positive bacteria

Question 13

Spirochetes is what

Answer 13

Is the only gram negative bacteria that is spiral in shape

Question 14

Diplococci in shape

Staphylococcus
Spirochetes
Moraxella
Enterococcus

Answer 14

Moraxella

Question 15

Gram negative bacteria that are circular in shape are

Answer 15

Moraxella and neisseria

They are usually dipplococci

Question 16

What bacteria is neither classified with cell wall

Hemophillius
Bacillius
Mycoplasma
Listeria

Answer 16

Mycoplasma

Question 17

Obligate anaerobes

Answer 17

They need an absent free oxygen environment to grow

They lack enzymes that attack oxygen formed radicals

Question 18

Obligate aerobes

Answer 18

They need oxygen to grow

They have peroxidase and catalase that attack hydrogen peroxide

They have superoxide dismutase that attack superoxide

Question 19

Facultative anaerobes

Answer 19

They require oxygen to grow ie to accept the final electron in ETC

But can also create a faculty that does not use oxygen and grow

They have only catalase and superoxide dismutase