Bacteria that might normally be killed by heat may survive if they are able to form:

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Quizplus · Accepted Answer

Bacteria that form spores have the ability to survive harsh conditions, including extreme temperatures. Spores are a dormant, protective form of the bacteria that can survive for long periods of time without nutrients or water. This allows the bacteria to wait until conditions are more favorable for growth and replication. Capsules, proteins, and toxins do not provide the same level of protection and do not enable bacteria to survive heat in the same way that spores can.

Bacteria That Might Normally Be Killed by Heat May Survive