QQuestionBiology
QuestionBiology
Which of the following would not be a source of nuclear DNA?
A. Sweat inside the rim of a baseball cap
B. Vomit mucus (a.k.a. snot or boogers) in a tissue
C. Part of a hair strand that has broken off
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Answer
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Step 1:I'll solve this problem step by step, focusing on identifying sources of nuclear DNA:
Step 2:: Understanding Nuclear DNA
Nuclear DNA is found in the nucleus of cells. To be a source of nuclear DNA, a sample must contain intact cell nuclei.
Step 3:: Analyzing Option A - Sweat inside the rim of a baseball cap
- Sweat is primarily composed of water, salt, and other electrolytes - Sweat itself does NOT contain cell nuclei - While sweat might have trace skin cells, the sweat liquid itself is NOT a source of nuclear DNA
Final Answer
Step 3: Analyzing Option B - Vomit mucus (snot/boogers) in a tissue - Mucus contains cells from the respiratory and digestive tracts - These cells have intact nuclei - Mucus typically contains white blood cells and epithelial cells Step 4: Analyzing Option C - Part of a hair strand that has broken off - Hair shaft itself is composed of keratin protein - ONLY the hair ROOT (follicle) contains nuclear DNA - A broken hair strand without the root does NOT contain nuclear DNA
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