Bacteria - Classification by gram staining

Question 1

What is gram staining?

Answer 1

A laboratory test used to differentiate between two bacterial groups: gram positive bacteria and gram-negative bacteria

Question 2

What two groups are bacteria classified into by gram staining?

Answer 2

Gram-positive

Gram-negative

Question 3

What colour do bacteria stain if they are gram-positive?

Answer 3

Blue/purple

Question 4

What colour do bacteria stain if they are gram-negative?

Answer 4

Pink

Question 5

What does it mean if a bacteria stains pink during gram staining?

Answer 5

They are gram-negative

Question 6

What does it mean if a bacteria stains blue/pink during gram staining?

Answer 6

They are gram-positive

Question 7

Describe gram-positive bacteria.

4 points

Answer 7

Their cell wall is one thick layer
No flagella
Produce endospores
Low resistance to antibiotics

Question 8

Describe gram-negative bacteria

4 points

Answer 8

Their cell wall contains two thin layers
Has flagella
Does not produce endospores
High resistance to antibiotics

Question 9

Do gram-positive or gram-negative bacteria produce endospores?

Answer 9

Gram positive bacteria produce endospores

Question 10

Do gram-positive or gram-negative bacteria have flagella?

Answer 10

Gram negative bacteria have flagella

Question 11

Are gram-negative or gram-positive bacteria highly-resistant to bacteria?

Answer 11

Gram negative bacteria are highly resistant to bacteria

Question 12

Do gram-positive or gram-negative bacteria have two thin layers in their cell wall?

Answer 12

Gram negative bacteria have a cell wall of two thin layers