Bacteria

Question 1

What is it?

Answer 1

single celled organisms which are only visible under a light microscope. They also have rigid outer walls which helps to determine their shape. Also, they favour undesirable conditions and when they are not favourable, they survive as spores.

Question 2

Bacilli

Answer 2

rod shaped with pointed ends

Question 3

Lactobacilli

Answer 3

rod shaped with round ends

Question 4

Spirochetes

Answer 4

spiral shaped

Question 5

Cocci

Answer 5

Circuler shaped

Question 6

Staphylococci

Answer 6

live in clusters

Question 7

Streptococci

Answer 7

live in chains

Question 8

Anaerobic bacteria

Answer 8

live deep inside carious lesions or periodontal pocket and survive with low oxygen levels

Question 9

Aerobic bacteria

Answer 9

needs oxygen to survive

Question 10

Antibiotics

Answer 10

taken to kill bacteria causing a severe illness, but can also kill some of the helpful bacteria naturally occurring (especially in digestive system) - therefore associated with stomach pain or diarrhoea

Question 11

Bactericidal agents

Answer 11

chemicals used to clean externally (work surfaces) that act to kill bacteria

Question 12

Bacteriostatic agents

Answer 12

chemicals used to clean externally that don’t kill bacteria but prevent them from reproducing and multiplying

Question 13

diseases and killing

Answer 13

Bacteria reproduce rapidly by fission and collect in colonies which may be seen by the naked eye. For example, dental caries and periodontal disease are caused by a bacterial infection. They are only killed by sterilisation within the dental environment.