Bacteria

Question 1

Features of bacteria

Answer 1

• Unicellular (prokaryotes)
• Cell membrane
• Cell wall
• No nucleus (genetic material in form of DNA)
• Move using flagella and pili
• Reproduce asexually

Question 2

Different shapes of bacteria

Answer 2

Round (coccus)

Rod (bacillus)

Question 3

Groupings of bacteria

Answer 3

Clusters (staphy)
Chains (strepto)
Pairs (diplo)
Spirals (vibrio, spirilla, spirochaetes)

Question 4

What do some bacteria retain gram stain but some don’t?

Answer 4

Varying composition of bacterial cell wall

Gram-positive (purple)
Gram-negative (pink)

Question 5

Why is classifying bacteria helpful?

Answer 5

Allows you to predict which antibiotics will be effective quickly and tells you what antibiotics to prescribe

Question 6

Streptococcus pnuemoniae is an example of a bacterial infection. What does is cause?

Answer 6

Pneumonia

Question 7

What classification is streptococcus pneumoniae?

Answer 7

• Gram-positive

- Cocci in pairs (diplococci)

Question 8

Where do streptococcus pneumoniae colonise?

Answer 8

Nose and throat. Invade other sites (e.g. lungs causing pneumonia)

Question 9

What are the symptoms of streptococcus pneumoniae?

Answer 9

Cough, dirty sputum, chest pain, breathlessness, fever

Can lead to blood stream infection, meningitis, death