unit 4

Question 1

. is Bacteria : Gram positive or gram negitive

Answer 1

both

Question 2

Cocci

Answer 2

Gram positive and gram negative

Question 3

Bacilli

Answer 3

Either Gram positive and gram negative

Question 4

Helminths

Answer 4

multicellular microorganisms parasitic worms, larvae, and arthropods living On the body

Question 5

Prions

Answer 5

: are small abnormally folded proteins that
cause infections

Question 6

Prokaryotic cells

Answer 6

bactira

Question 7

Eukaryotic cells

Answer 7

Fungus
◦ Protozoa
◦ Helminths
Higher life forms, plants, animals, and humans are eukaryotes

Question 8

Prokaryotic cells weakneeses

Answer 8

Antibiotics

Question 9

Eukaryotic cells weakness

Answer 9

Diseases caused by these organisms are very difficult to treat

Question 10

Stain with crystal violet

Answer 10

Treat with iodine * Treat with decolourizing
alcohol

Question 11

Gram Stains Purpose

Answer 11

First step towards identifying unknown
bacteria

Question 12

The difference between gram-negative and grampositive

Answer 12

bacteria can be important when determining
appropriate treatment for an infection.

Question 13

Microbiological Culture Media

Answer 13

Gels or Broths
* Promote Growth of organisms
* Bring out characteristics to aid in identification

Question 14

Selective

Answer 14

growth a specific organisms

Question 15

Differential

Answer 15

contains specific ingredients to distinguish
between closely related organisms

Question 16

• Enriched media

Answer 16

– additional nutrients supports the
growth of a range of organisms

Question 17

Transport media

Answer 17

purpose is to keep the organisms
alive during transport for testing

Question 18

Cocci Bacteria

Answer 18

Spherical * Irregular clusters * Chains * Diplococci (pairs) * sets of four (tetrads)

Question 19

Staphylococci

Answer 19

gram-positive spherical cocci Most common cause of wound infections

Question 20

Staphylococcus aureus eye infections include:

Answer 20

Blepharitis
* Chalazion
* Staph marginal ulcers
* Meibomitis

Question 21

Neisseriaceae:

Answer 21

Bean shaped gram negative diplococci
* Preference for mucous membranes
* Can invade intact tissue

Question 22

Neisseria gonorrhoeae

Answer 22

causative agent of gonorrhea
* Severe and damaging conjunctivitis

Question 23

Propionibacterium acnes

Answer 23

adult skin and conjunctiva, living off the sebum
and oil produced in sebaceous glands.

Question 24

where Haemophilus influenza

Answer 24

childhood eye infections

Question 25

Spiral Bacteria

Answer 25

Corkscrew shape * Ability to penetrate into tissue

Question 26

Fusarium Solani
Aspergillus

Answer 26

abundant in soil and plant material ◦ traumatic keratitis and corneal ulcer.

Question 27

Eukaryotic unicellular organisms

Answer 27

transmitted by contaminated food and water ◦ insect bites

Question 28

Acanthamoebic keratitis

Answer 28

Serious corneal infection * Difficult to treat * Can result in blindness. * Contact lens wear is a risk factor

Question 29

Toxocara

Answer 29

ngestion of larvae in dog or cat feces
* Toxocariasis is caused by the migration of the
larvae into the eye

Question 30

Strand of DNA or RNA surrounded by a protein coat

Answer 30

Can only reproduce if they infect a cell.