Question

Passive and Active Transport Questions

Many fruits are canned and preserved in a concentrated sugar solution. Using what you have learned, explain how this stops bacterial growth.

Before refrigeration, people often stored meat packed in salt to act as a preservative. How does salt preserve meat?

Your response to this question should be at least two paragraphs

I would highly appreciate if it was in a text form not handwritten.

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Answer 1

Answer:

Many fruits are canned and preserved in a concentrated sugar solution. Using what you have learned, explain how this stops bacterial growth.

• High sugar content helps in preventing bacterial growth.
• The bacteriostatic action of high sugar content can be attributed to high osmotic pressure of the sugar solution.
• The high concentration of sugar causes the solution to become hypertonic. A hypertonic solution means that the concentration of solutes is greater outside the cell.
• As a result, bacterial cells are hypotonic with respect to the sugar solution. That means bacterial cells have lower osmotic pressure inside the cell as compared to the surrounding.
• So when placed in a hypertonic solution, the bacterial cells will lose water causing shrinkage and death of the cell. This mechanism helps in preventing the spoilage of food containing high concentration of sugar.

Before refrigeration, people often stored meat packed in salt to act as a preservative. How does salt preserve meat?

• Salt prevents bacteria from growing and helps in preservation of food
• Salt cured meat or salting meat is a procedure that is used to preserve meat.
• Salt acts as a dehydrating agent and removes the moisture from the meat rendering the conditions unsuitable for bacteria to grow.
• Salt also provides a hypertonic environment that is not favorable for microorganisms to grow.