Options: Adenovirus Saccharomyces cerevisiae Escherichia coli Stapylococcus aure

Question

Options: Adenovirus

Saccharomyces cerevisiae

Escherichia coli

Stapylococcus aureus

Mycobacterium tuberculosis

Herpes Virus

Endospore of Clostridium Botulinum

Place the microbes/microbial forms in order from least resistant to environmental stresses (disinfectants, heat treatment, etc.) to most resistant to environmental stresses (This means the least resistant will be #1) You will need to look up for each choice what type of organism it is. Then, you will need to compare that to information in the notes about which types of organism are less resistant to stress (easier to kill) and which are harder to kill. 1 least resistant Choose ] 2 l Choose ] Choose 4 Choose l I Choose I Choose l 7 most resistant Choose

Explanation / Answer

The correct answers are,

1 least resistant: Herpes Virus

2: Staphylococcus aureus

3: Adenovirus

4: Saccharomyces cerevisiae

5: Escherichia coli

6: Mycobacterium tuberculosis

7 most resistant: Endospore of Clostridium botulinum

Explanation:

Herpes virus is an example of an enveloped virus. Enveloped viruses are those viruses that contain a membranous envelope outside the nucleocapsid. The envelope is basically a lipid bilayer and glycoprotein that surrounds the nucleocapsid. This membranous envelope is easily broken down.

Staphylococcus aureus is an example of Gram-positive bacteria. Gram-positive bacteria lack the outer membrane, unlike Gram-negative bacteria. So, Gram-positive bacteria are more susceptible than Gram-negative bacteria.

Adenovirus is an example of a large non-enveloped virus. Due to its large size and the protein coat (capsid), it is more resistant than Gram-positive bacteria.

Saccharomyces cerevisiae is a unicellular fungus. It is also called as Baker's yeast. It is more resistant than the large non-enveloped virus.

Escherichia coli is an example of a Gram-negative bacteria. Gram-negative bacteria contain outer membrane. It is more resistant than the fungi.

Mycobacterium tuberculosis is an example of Mycobacteria. It contains a waxy cell wall. Therefore it is more resistant than the Gram-negative bacteria.

Bacteria (such as Clostridium) form a heat resistant and dehydrated structure, called endospore. Endospores are extraordinarily resistant to environmental stresses. Therefore, it is difficult to eliminate endospores than bacterial cells. Therefore, endospore of Clostridium botulinum is the most resistant in this question.

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