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Section B: Structured Question 1. (a) A piece of kitchen aluminum foil is used to wrap food to be cooked in a barbecue fire. One side of the foil is shiny, while the other side is dull. Which side should be on the outside and why? (b) Most houses in countries that experience winter have air heaters installed. These heaters are usually installed near the floor. Explain why. Section C: Free-Response Question

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Describe the steps involved in a COVID-19 PCR test. A COVID-19 PCR test involves several steps to accurately detect the presence of the virus. The steps are as follows:
  1. Sample Collection: The first step is to collect a sample from the patient. This is usually done by taking a swab from the back of the throat or the nasal cavity. The swab is then placed in a sterile container to prevent contamination.
  2. Sample Preparation: Once the sample is collected, it needs to be prepared for testing. This involves transferring the sample to a laboratory tube or vial containing a special solution that helps preserve the genetic material of the virus.
  3. RNA Extraction: The next step is to extract the viral RNA from the sample. This is done by adding chemicals to break open the virus and release its genetic material. The RNA is then separated from other components of the sample.
  4. Reverse Transcription: After the RNA is extracted, a process called reverse transcription is performed. This converts the viral RNA into complementary DNA (cDNA) using an enzyme called reverse transcriptase. The cDNA is more stable and can be easily amplified for further analysis.
  5. Amplification: The cDNA is then subjected to a process called polymerase chain reaction (PCR). This involves repeatedly heating and cooling the sample to amplify specific regions of the viral genetic material. The PCR reaction uses primers that are designed to target unique sequences of the virus.
  6. Detection: The amplified DNA is then analyzed to determine the presence of the virus. This can be done using various methods, such as gel electrophoresis or real-time PCR. The presence of the virus is indicated by the appearance of specific bands or a positive signal.
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Question Text
Section B: Structured Question 1. (a) A piece of kitchen aluminum foil is used to wrap food to be cooked in a barbecue fire. One side of the foil is shiny, while the other side is dull. Which side should be on the outside and why? (b) Most houses in countries that experience winter have air heaters installed. These heaters are usually installed near the floor. Explain why. Section C: Free-Response Question
TopicAll topics
SubjectBiology
ClassClass 11