Which statement about freezing is true regarding parasites and bacteria?

• A. It speeds up bacterial growth
• B. It has no effect
• C. It makes bacteria more resistant to heat
• D. It kills parasites and slows bacteria growth

Answer: (D)

Freezing slows down microbial activity by turning water into ice, which makes it hard for cells to move and carry out normal processes. Because of that, bacteria aren’t growing during freezing and their metabolism drops dramatically. In some cases, certain parasites can be killed by sufficiently low temperatures and enough time, so freezing can reduce parasitic hazards. That combination is why the statement about freezing killing parasites and slowing bacterial growth is the most accurate among the options.

The other statements don’t fit: freezing does not speed up bacterial growth, it does have an effect, and it does not make bacteria more resistant to heat. Also, be aware that once thawed, surviving bacteria can start growing again, so proper handling after thawing is important.