Question

1. currently, which one of the following methods of evaluating disinfectants is used as a standard best – practice methodology?

1. Use – dilution test
2. Use – diffusion test
3. Disk – dilution test
4. Disk – diffusion test
5. Any can be used depending on the bacteria tested

1. What are the small segments of DNA that can move from one region of a DNA molecule to another?

1. operons
2. transposons
3. plasmids
4. micro RNAs
5. rDNA

Answer 1

Q1)

• d) Disk – diffusion test

The two tests most commonly used are Use-Dilution, for testing for efficacy of disinfectant on a surface; while the Disk-Diffusion method tests for the efficacy of an anti-microbial on a particular surface. However, the Disk-Diffusion method gives the quantifiable efficacy of that particular disinfectant against any microbe tested.

Q2)

• b) Transposons

Transposons, first discovered by Barbara McClintock in Maize, are DNA elements that have the ability to excise themselves from the Genome and re-integrate at secondary locations on the genome.