Question

kochs postulates help identify the causative agent of a particular disease. the causative agent can also be referred to as the:
correlative agent
reservoir agent
etiologic agent
critical agent
question 8 1 pts
which of the following statements accurately describes louis pasteurs swan neck flask experiment? select all that apply.
the neck of the flask used in the experiment was bent into an s shape.
the experiment allowed air to enter the flask.
microorganisms from the air could not enter the sterile broth inside the flask with an intact s shaped neck.
microorganisms from the air could enter the sterile broth inside the flask with an intact s-shaped neck.
the broth in the flask remained sterile as long as the s shaped neck was intact.
the broth in the flask became turbid even when the s shaped neck was intact.
breaking the s shaped neck of the flask resulted in a broth that was no longer sterile.

Explanation:

• For the first question:
• Koch's postulates are used to identify the cause of a disease. The term "etiologic" refers to the cause or origin of a disease. So the causative agent is also called the etiologic agent.
• For the second question (Louis Pasteur's Swan Neck Flask experiment):
• The flask had an S - shaped neck. Air could enter (as the neck was open to the air), but microorganisms were trapped in the curve of the S - shaped neck. So, as long as the neck was intact, the broth was sterile. When the neck was broken, microorganisms could enter and the broth was no longer sterile.

Answer:

• First question: Etiologic agent
• Second question:
• The neck of the flask used in the experiment was bent into an S shape.
• The experiment allowed air to enter the flask.
• Microorganisms from the air could not enter the sterile broth inside the flask with an intact S - shaped neck.
• The broth in the flask remained sterile as long as the S - shaped neck was intact.
• Breaking the S - shaped neck of the flask resulted in a broth that was no longer sterile.