Question

43. Gram negative rod, spread in the feces of humans only, incubation period two weeks, symptoms begin with high fever and headache for a week, followed with diarrhea in the second week.

Campylobacter jejuni

Staphylococcus aureus

Salmonella enterica Typhi

Salmonella enterica

Shigella sonnei

53. 1. Identify a specific chemical/ or sterilization process that you could use to to sterilize or disinfect the following:

A. Skin before an injection

B. Agar media for growing bacteria

C. Surface infected with coronavirus

2. Why was DNA polymerase "Molecule of the Year"? (2)

Answer 1

43)

solu :

• Shigella sonnei : Shigella sonnei causes shegellois ,
• Shigellois is an infectious disease and the who are infected with shigela sonnei develope diarrhea,fever,stomach cramps etc.

53)

solu :

• Skin before injection : Alcohol is used to disinfect the skin before injection.Alcohol is a good disinfectant and reduce all the bacteria on skin.
• Agar media for growing bacteria : Autoclave, the process of growth medium sterilization is commonly performed by autoclaving.
• DNA polymerase is responsible for the process of DNA replication,during which double standard DNA molecule is copied into two identical DNA molecules.